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_README.md

mamba 2.6 performance test

this is a replication of the repo2docker tests/conda/downgrade test (environment files are unmodified), which is dramatically slower after upgrading mamba to 2.6.

Two stages:

  1. install initial frozen environment (@explicit file, no solve):

    mamba install -p /tmp/env -f environment.py-3.9-linux-64.lock

  2. 'update' the env with packages that will force a downgrade:

    mamba env update -p /tmp/env -f downgrade.yml

With mamba 2.5.0, resolving and executing the downgrade takes ~85 seconds (42 seconds with a warm cache). With mamba 2.6.0, it takes 472 seconds (closer to 430 with warm cache).

This may not be a 100% perfect comparison with cache states, but ~all of the slowdown is in the mamba 2.6 Resolving environment step (424s), so cache shouldn't be super relevant.

Full script:

docker run --rm -it -v$PWD:/io -w /io --platform linux/amd64 quay.io/condaforge/miniforge3
# in container

# install mamba
mamba create -n mamba25 mamba=2.5
mamba create -n mamba26 mamba=2.6

# create base env
time mamba run -n mamba25 mamba create -y -p /tmp/test25 -f environment.py-3.9-linux-64.lock
time mamba run -n mamba26 mamba create -y -p /tmp/test26 -f environment.py-3.9-linux-64.lock

# run downgrade
time mamba run -n mamba25 mamba env update -y -p /tmp/test25 -f downgrade.yml
time mamba run -n mamba26 mamba env update -y -p /tmp/test26 -f downgrade.yml
Raw
downgrade.yml
# originally xeus-cling@0.6.0
# added python=3.9 pin because implicit downgrade of Python from 3.10 to 3.9 isn't allowed
name: xeus-cling
channels:
- conda-forge
dependencies:
- python=3.9
- xeus-cling=0.6.0
- xtensor=0.20.8
- xtensor-blas=0.16.1
- notebook
Raw
environment.py-3.9-linux-64.lock
# AUTO GENERATED FROM environment.py-3.9.yml, DO NOT MANUALLY MODIFY
# Frozen on 2025-10-16 07:16:41 UTC
# Generated by conda-lock.
# platform: linux-64
# input_hash: bd4d374cae58bd84b0ba870367f38a90b671ab1c952a6cf4a62296b73b6accc9
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https://conda.anaconda.org/conda-forge/linux-64/pyzmq-27.0.2-py39haa5fa38_0.conda#a12afe53883b54e2df984dd45bc36063
https://conda.anaconda.org/conda-forge/noarch/referencing-0.36.2-pyh29332c3_0.conda#9140f1c09dd5489549c6a33931b943c7
https://conda.anaconda.org/conda-forge/noarch/rfc3339-validator-0.1.4-pyhd8ed1ab_1.conda#36de09a8d3e5d5e6f4ee63af49e59706
https://conda.anaconda.org/conda-forge/noarch/rfc3987-syntax-1.1.0-pyhe01879c_1.conda#7234f99325263a5af6d4cd195035e8f2
https://conda.anaconda.org/conda-forge/noarch/stack_data-0.6.3-pyhd8ed1ab_1.conda#b1b505328da7a6b246787df4b5a49fbc
https://conda.anaconda.org/conda-forge/noarch/terminado-0.18.1-pyh0d859eb_0.conda#efba281bbdae5f6b0a1d53c6d4a97c93
https://conda.anaconda.org/conda-forge/noarch/tinycss2-1.4.0-pyhd8ed1ab_0.conda#f1acf5fdefa8300de697982bcb1761c9
https://conda.anaconda.org/conda-forge/noarch/typing-extensions-4.14.1-h4440ef1_0.conda#75be1a943e0a7f99fcf118309092c635
https://conda.anaconda.org/conda-forge/noarch/typing-inspection-0.4.1-pyhd8ed1ab_0.conda#e0c3cd765dc15751ee2f0b03cd015712
https://conda.anaconda.org/conda-forge/noarch/annotated-types-0.7.0-pyhd8ed1ab_1.conda#2934f256a8acfe48f6ebb4fce6cde29c
https://conda.anaconda.org/conda-forge/noarch/anyio-4.10.0-pyhe01879c_0.conda#cc2613bfa71dec0eb2113ee21ac9ccbf
https://conda.anaconda.org/conda-forge/linux-64/argon2-cffi-bindings-25.1.0-py39hd399759_0.conda#dfa88a4227076fa51b9a8afd0ed06cee
https://conda.anaconda.org/conda-forge/noarch/arrow-1.3.0-pyhd8ed1ab_1.conda#46b53236fdd990271b03c3978d4218a9
https://conda.anaconda.org/conda-forge/noarch/beautifulsoup4-4.13.4-pyha770c72_0.conda#9f07c4fc992adb2d6c30da7fab3959a7
https://conda.anaconda.org/conda-forge/noarch/bleach-with-css-6.2.0-h82add2a_4.conda#a30e9406c873940383555af4c873220d
https://conda.anaconda.org/conda-forge/linux-64/cryptography-45.0.6-py39hb2f7f84_0.conda#09c640d5a5798c2f520baf821a0fc0fa
https://conda.anaconda.org/conda-forge/noarch/fqdn-1.5.1-pyhd8ed1ab_1.conda#d3549fd50d450b6d9e7dddff25dd2110
https://conda.anaconda.org/conda-forge/noarch/ipython-8.18.1-pyh707e725_3.conda#15c6f45a45f7ac27f6d60b0b084f6761
https://conda.anaconda.org/conda-forge/noarch/jsonschema-specifications-2025.4.1-pyh29332c3_0.conda#41ff526b1083fde51fbdc93f29282e0e
https://conda.anaconda.org/conda-forge/noarch/jupyter_client-8.6.3-pyhd8ed1ab_1.conda#4ebae00eae9705b0c3d6d1018a81d047
https://conda.anaconda.org/conda-forge/noarch/jupyter_server_terminals-0.5.3-pyhd8ed1ab_1.conda#2d983ff1b82a1ccb6f2e9d8784bdd6bd
https://conda.anaconda.org/conda-forge/noarch/mako-1.3.10-pyhd8ed1ab_0.conda#c5bb3eea5f1a00fcf3d7ea186209ce33
https://conda.anaconda.org/conda-forge/linux-64/pydantic-core-2.33.2-py39h20260ba_0.conda#38b79310c98c3a2270e1d19589205a6a
https://conda.anaconda.org/conda-forge/linux-64/sqlalchemy-2.0.43-py39hd399759_0.conda#227867c51ee09b270f31ca28221e57d1
https://conda.anaconda.org/conda-forge/linux-64/zstandard-0.23.0-py39hd399759_3.conda#2f6845f6cdf545845a60c4dcbd017c78
https://conda.anaconda.org/conda-forge/noarch/alembic-1.16.4-pyhd8ed1ab_0.conda#b17cf31f353008d23a6fd8bd90efcfc2
https://conda.anaconda.org/conda-forge/noarch/argon2-cffi-25.1.0-pyhd8ed1ab_0.conda#8ac12aff0860280ee0cff7fa2cf63f3b
https://conda.anaconda.org/conda-forge/noarch/certipy-0.2.2-pyhd8ed1ab_0.conda#7bacdbd6bb3b4fe905a3235d2799ca78
https://conda.anaconda.org/conda-forge/noarch/httpcore-1.0.9-pyh29332c3_0.conda#4f14640d58e2cc0aa0819d9d8ba125bb
https://conda.anaconda.org/conda-forge/noarch/ipykernel-6.30.1-pyh82676e8_0.conda#b0cc25825ce9212b8bee37829abad4d6
https://conda.anaconda.org/conda-forge/noarch/ipywidgets-8.1.7-pyhd8ed1ab_0.conda#7c9449eac5975ef2d7753da262a72707
https://conda.anaconda.org/conda-forge/noarch/isoduration-20.11.0-pyhd8ed1ab_1.conda#0b0154421989637d424ccf0f104be51a
https://conda.anaconda.org/conda-forge/noarch/jsonschema-4.25.1-pyhe01879c_0.conda#341fd940c242cf33e832c0402face56f
https://conda.anaconda.org/conda-forge/noarch/oauthlib-3.3.1-pyhd8ed1ab_0.conda#d4f3f31ee39db3efecb96c0728d4bdbf
https://conda.anaconda.org/conda-forge/noarch/pydantic-2.11.7-pyh3cfb1c2_0.conda#1b337e3d378cde62889bb735c024b7a2
https://conda.anaconda.org/conda-forge/noarch/urllib3-2.5.0-pyhd8ed1ab_0.conda#436c165519e140cb08d246a4472a9d6a
https://conda.anaconda.org/conda-forge/noarch/httpx-0.28.1-pyhd8ed1ab_0.conda#d6989ead454181f4f9bc987d3dc4e285
https://conda.anaconda.org/conda-forge/noarch/jsonschema-with-format-nongpl-4.25.1-he01879c_0.conda#13e31c573c884962318a738405ca3487
https://conda.anaconda.org/conda-forge/noarch/nbformat-5.10.4-pyhd8ed1ab_1.conda#bbe1963f1e47f594070ffe87cdf612ea
https://conda.anaconda.org/conda-forge/noarch/requests-2.32.5-pyhd8ed1ab_0.conda#db0c6b99149880c8ba515cf4abe93ee4
https://conda.anaconda.org/conda-forge/noarch/jupyter_events-0.12.0-pyh29332c3_0.conda#f56000b36f09ab7533877e695e4e8cb0
https://conda.anaconda.org/conda-forge/noarch/nbclient-0.10.2-pyhd8ed1ab_0.conda#6bb0d77277061742744176ab555b723c
https://conda.anaconda.org/conda-forge/noarch/jupyterhub-base-5.3.0-pyhda7c55b_0.conda#2a47623cd374e67413707b9925908313
https://conda.anaconda.org/conda-forge/noarch/nbconvert-core-7.16.6-pyh29332c3_0.conda#d24beda1d30748afcc87c429454ece1b
https://conda.anaconda.org/conda-forge/noarch/jupyter_server-2.16.0-pyhe01879c_0.conda#f062e04d7cd585c937acbf194dceec36
https://conda.anaconda.org/conda-forge/noarch/jupyter-lsp-2.2.6-pyhe01879c_0.conda#7129ed52335cc7164baf4d6508a3f233
https://conda.anaconda.org/conda-forge/noarch/jupyter-offlinenotebook-0.3.1-pyh885dcc9_1.conda#aff9028145d26b0987d0959a989e40cf
https://conda.anaconda.org/conda-forge/noarch/jupyter-resource-usage-1.2.0-pyhd8ed1ab_0.conda#9ef4adccd3a32f3f01fc998f2ad4bdf5
https://conda.anaconda.org/conda-forge/noarch/jupyterlab_server-2.27.3-pyhd8ed1ab_1.conda#9dc4b2b0f41f0de41d27f3293e319357
https://conda.anaconda.org/conda-forge/noarch/notebook-shim-0.2.4-pyhd8ed1ab_1.conda#e7f89ea5f7ea9401642758ff50a2d9c1
https://conda.anaconda.org/conda-forge/noarch/jupyterlab-4.4.6-pyhd8ed1ab_0.conda#70cb2903114eafc6ed5d70ca91ba6545
https://conda.anaconda.org/conda-forge/noarch/jupyterhub-singleuser-5.3.0-h4422900_0.conda#c4e0da69399fb5bd8e314ec2da0f0119
https://conda.anaconda.org/conda-forge/noarch/notebook-7.4.5-pyhd8ed1ab_0.conda#28062c17cdb444388c00903eaec1ba0e
@jjerphan

jjerphan commented May 28, 2026 •
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Fixed by mamba-org/mamba#4298:

 → time ./build/micromamba/micromamba env update -p /tmp/env -f /tmp/downgrade.yml --dry-run                                                            
Using Cached Shard Index for conda-forge/linux-64                                                   ✔ Done                                     
Using Cached Shard Index for conda-forge/noarch                                                     ✔ Done                                     
Fetching and Parsing Packages' Shards                                                     ✔ Done (0.2 sec)                                     
                                                                                                                                               
Resolving Environment                                                                    ✔ Done (17.4 sec)                                     
                                                                                                                                               
Transaction                                                                                                                                    
                                                                                                                                               
  Prefix: /tmp/env                                                                                                                               
                                                                                                                                               
  Updating specs:                                                                                                                              
                                                                                                                                               
   - python=3.9                                                                                                                                
   - xeus-cling=0.6.0                                                                                                                          
   - xtensor=0.20.8                                                                                                                            
   - xtensor-blas=0.16.1                                                                                                                       
   - notebook                                                                                                                                  
                                                                                                                                               
                                                                                                                                               
  Package                               Version  Build                Channel           Size                                                                                
──────────────────────────────────────────────────────────────────────────────────────────────                                                                              
  Install:                                                                                                                                                                  
──────────────────────────────────────────────────────────────────────────────────────────────                                                                              
                                                                                                                                                                            
  + binutils_impl_linux-64               2.33.1  h53a641e_8           conda-forge       10MB                                                                                
  + binutils_linux-64                    2.33.1  h9595d00_17          conda-forge       22kB                                                                                
  + clang_variant                           1.0  cling_6.14.06        conda-forge        9kB                                                                                
  + clangdev                              5.0.0  h935a590_1004        conda-forge       95MB                                                                                
  + cling                                   0.5  he860b03_1007        conda-forge       25MB                                                                                
  + cppzmq                                4.3.0  hc9558a2_1001        conda-forge       15kB                                                                                
  + entrypoints                             0.4  pyhd8ed1ab_1         conda-forge       11kB                                                                                
  + gcc_impl_linux-64                     7.3.0  hd420e75_5           conda-forge       74MB                                                                                
  + gcc_linux-64                          7.3.0  h553295d_17          conda-forge       22kB                                                                                
  + gxx_impl_linux-64                     7.3.0  hdf63c60_5           conda-forge       20MB                                                                                                                           
  + gxx_linux-64                          7.3.0  h553295d_17          conda-forge       22kB                                                                                                                           
  + importlib_resources                   6.5.2  pyhd8ed1ab_0         conda-forge       34kB                                                                                                                           
  + ipython_genutils                      0.2.0  pyhd8ed1ab_2         conda-forge       28kB                                                                                                                           
  + jupyter_telemetry                     0.1.0  pyhd8ed1ab_1         conda-forge       10kB                                                                                                                           
  + libblas                               3.9.0  8_openblas           conda-forge       12kB                                                                                                                           
  + libcblas                              3.9.0  8_openblas           conda-forge       12kB                                                                                                                           
  + libgfortran-ng                        7.5.0  h14aa051_20          conda-forge       23kB                                                                                                                           
  + libgfortran4                          7.5.0  h14aa051_20          conda-forge        1MB                                                                                                                           
  + liblapack                             3.9.0  8_openblas           conda-forge       12kB                                                                                                                           
  + libopenblas                          0.3.12  pthreads_hb3c22a3_1  conda-forge        9MB                                                                                                                           
  + nbclassic                             1.3.1  pyhe01879c_0         conda-forge       14MB                                                                                                                           
  + nlohmann_json                         3.6.1  he1b5a44_0           conda-forge      104kB                                                                                                                           
  + pkgutil-resolve-name                 1.3.10  pyhd8ed1ab_2         conda-forge       11kB                                                                                                                           
  + pyrsistent                           0.17.3  py39hbd71b63_1       conda-forge       92kB                                                                                                                           
  + ruamel.yaml                         0.16.12  py39hbd71b63_1       conda-forge      171kB                                                                                                                           
  + ruamel.yaml.clib                      0.2.2  py39hbd71b63_1       conda-forge      164kB                                                                                                                           
  + sqlite                               3.33.0  h4cf870e_1           conda-forge        1MB                                                                                                                           
  + xeus                                 0.20.0  h4d8c418_1           conda-forge        4MB                                                                                                                           
  + xeus-cling                            0.6.0  he513fc3_1           conda-forge       20MB                                                                                                                           
  + xtensor                              0.20.8  hc9558a2_0           conda-forge      162kB                                                                                                                           
  + xtensor-blas                         0.16.1  h776b511_0           conda-forge      263kB                                                                                                                           
  + xtl                                  0.6.21  h0efe328_1           conda-forge       97kB                                                                                                                           
  + xz                                    5.2.5  h516909a_1           conda-forge      352kB                                                                                                                           
                                                                                                                                                                                                                       
  Remove:                                                                                                                                                                                                              
──────────────────────────────────────────────────────────────────────────────────────────────                                                                                                                         
                                                                                                                                                                                                                       
  - argon2-cffi-bindings                 25.1.0  py39hd399759_0       conda-forge     Cached                                                                                                                           
  - jsonschema-specifications          2025.4.1  pyh29332c3_0         conda-forge     Cached                                                                                                                           
  - keyutils                              1.6.3  hb9d3cd8_0           conda-forge     Cached                                                                                                                           
  - libexpat                              2.7.1  hecca717_0           conda-forge     Cached                                                                                                                           
  - liblzma                               5.8.1  hb9d3cd8_2           conda-forge     Cached                                                                                                                           
  - libnsl                                2.0.1  hb9d3cd8_1           conda-forge     Cached                                                                                                                           
  - libsqlite                            3.50.4  h0c1763c_0           conda-forge     Cached                                                                                                                           
  - libstdcxx                            15.2.0  h8f9b012_7           conda-forge     Cached                                                                                                                           
  - libxcrypt                            4.4.36  hd590300_1           conda-forge     Cached                                                                                                                           
  - pydantic-core                        2.33.2  py39h20260ba_0       conda-forge     Cached                                                                                                                           
  - referencing                          0.36.2  pyh29332c3_0         conda-forge     Cached                                                                                                                           
  - rpds-py                              0.27.0  py39h17f49b6_0       conda-forge     Cached                                                                                                                           
                                                                                                                                                                                                                       
  Change:                                                                                                                                                                                                              
──────────────────────────────────────────────────────────────────────────────────────────────                                                                                                                         
                                                                                                                                                                                                                       
  - bzip2                                 1.0.8  hda65f42_8           conda-forge     Cached                                                                                                                           
  + bzip2                                 1.0.8  h516909a_3           conda-forge      407kB                                                                                                                           
  - jupyterlab_pygments                   0.3.0  pyhd8ed1ab_2         conda-forge     Cached                                                                                                                           
  + jupyterlab_pygments                   0.3.0  pyhd8ed1ab_0         conda-forge       19kB                                                                                                                           
  - markupsafe                            3.0.2  py39h9399b63_1       conda-forge     Cached                                                                                                                           
  + markupsafe                            3.0.2  pyhe1237c8_1         conda-forge       15kB                                                                                                                           
  - yaml                                  0.2.5  h280c20c_3           conda-forge     Cached                                                                                                                           
  + yaml                                  0.2.5  h516909a_0           conda-forge       84kB                                                                                                                           
                                                                                                                                                                                                                       
  Downgrade:                                                                                                                                                                                                           
──────────────────────────────────────────────────────────────────────────────────────────────                                                                                                                         
                                                                                                                                                                                                                       
  - alembic                              1.16.4  pyhd8ed1ab_0         conda-forge     Cached                                                                                                                           
  + alembic                              1.14.1  pyhd8ed1ab_0         conda-forge      160kB                                                                                                                           
  - anyio                                4.10.0  pyhe01879c_0         conda-forge     Cached                                                                                                                           
  + anyio                                 3.7.1  pyhd8ed1ab_0         conda-forge       97kB                                                                                                                           
  - argon2-cffi                          25.1.0  pyhd8ed1ab_0         conda-forge     Cached                                                                                                                           
  + argon2-cffi                          20.1.0  py39hbd71b63_2       conda-forge       48kB                                                                                                                           
  - brotli-python                         1.1.0  py39hf88036b_3       conda-forge     Cached                                                                                                                           
  + brotli-python                         1.0.9  py39hfbd4741_3       conda-forge      368kB                                                                                                                           
  - cffi                                 1.17.1  py39h15c3d72_0       conda-forge     Cached                                                                                                                           
  + cffi                                 1.14.4  py39he88106c_0       conda-forge      232kB                                                                                                                           
  - cryptography                         45.0.6  py39hb2f7f84_0       conda-forge     Cached                                                                                                                           
  + cryptography                          3.2.1  py39h01d1d65_0       conda-forge      636kB                                                                                                                           
  - debugpy                              1.8.16  py39haef64b4_0       conda-forge     Cached                                                                                                                           
  + debugpy                               1.2.0  py39h41458e0_0       conda-forge        2MB                                                                                                                           
  - greenlet                              3.2.4  py39h818bca1_0       conda-forge     Cached                                                                                                                           
  + greenlet                             0.4.17  py39h07f9747_1       conda-forge       23kB                                                                                                                                                                                                  
  - httpcore                              1.0.9  pyh29332c3_0         conda-forge     Cached                                                                                                                           
  + httpcore                             0.13.2  pyhd8ed1ab_0         conda-forge       34kB                                                                                                                                                                                                  
  - httpx                                0.28.1  pyhd8ed1ab_0         conda-forge     Cached                                                                                                                           
  + httpx                                0.25.1  pyhd8ed1ab_0         conda-forge       64kB                                                                                                                           
  - icu                                    75.1  he02047a_0           conda-forge     Cached                                                                                                                           
  + icu                                    68.1  h58526e2_0           conda-forge       14MB                                                                                                                           
  - ipykernel                            6.30.1  pyh82676e8_0         conda-forge     Cached                                                                                                                                                                                                  
  + ipykernel                            6.20.2  pyh210e3f2_0         conda-forge      111kB                                                                                                                           
  - jsonschema                           4.25.1  pyhe01879c_0         conda-forge     Cached                                                                                                                                                                                                  
  + jsonschema                           4.17.3  pyhd8ed1ab_0         conda-forge       70kB                                                                                                                           
  - jsonschema-with-format-nongpl        4.25.1  he01879c_0           conda-forge     Cached                                                                                                                                                                                                  
  + jsonschema-with-format-nongpl        4.17.3  pyhd8ed1ab_0         conda-forge        7kB                                                                                                                                                                                                  
  - jupyter-resource-usage                1.2.0  pyhd8ed1ab_0         conda-forge     Cached                                                                                                                           
  + jupyter-resource-usage                0.7.1  pyhd8ed1ab_0         conda-forge       34kB                                                                                                                           
  - jupyter_client                        8.6.3  pyhd8ed1ab_1         conda-forge     Cached                                                                                                                           
  + jupyter_client                        7.1.2  pyhd8ed1ab_0         conda-forge       92kB                                                                                                                           
  - jupyter_events                       0.12.0  pyh29332c3_0         conda-forge     Cached                                                                                                                                                                                                  
  + jupyter_events                        0.6.3  pyhd8ed1ab_1         conda-forge       21kB                                                                                                                                                                                                  
  - jupyter_server                       2.16.0  pyhe01879c_0         conda-forge     Cached                                                                                                                                                                                                  
  + jupyter_server                       1.24.0  pyhd8ed1ab_0         conda-forge      244kB                                                                                                                                                                                                  
  - jupyterhub-base                       5.3.0  pyhda7c55b_0         conda-forge     Cached                                                                                                                                                                                                  
  + jupyterhub-base                       3.1.1  pyh2a2186d_0         conda-forge        2MB                                                                                                                                                                                                  
  - jupyterhub-singleuser                 5.3.0  h4422900_0           conda-forge     Cached                                                                                                                                                                                                  
  + jupyterhub-singleuser                 3.1.1  pyh2a2186d_0         conda-forge        8kB                                                                                                                                                                                                  
  - jupyterlab                            4.4.6  pyhd8ed1ab_0         conda-forge     Cached                                                                                                                                                                                                  
  + jupyterlab                            3.5.3  pyhd8ed1ab_0         conda-forge        6MB                                                                                                                                                                                                  
  - jupyterlab_server                    2.27.3  pyhd8ed1ab_1         conda-forge     Cached                                                                                                                                                                                                  
  + jupyterlab_server                    2.24.0  pyhd8ed1ab_0         conda-forge       60kB                                                                                                                                                                                                  
  - krb5                                 1.21.3  h659f571_0           conda-forge     Cached                                                                                                                                                                                                  
  + krb5                                 1.17.2  h926e7f8_0           conda-forge        2MB                                                                                                                                                                                                  
  - ld_impl_linux-64                       2.44  ha97dd6f_2           conda-forge     Cached                                                                                                                                                                                                  
  + ld_impl_linux-64                     2.33.1  h53a641e_8           conda-forge      603kB                                                                                                                                                                                                  
  - libedit                        3.1.20250104  pl5321h7949ede_0     conda-forge     Cached                                                                                                                                                                                                  
  + libedit                        3.1.20191231  he28a2e2_2           conda-forge      124kB                                                                                                                                                                                                  
  - libffi                                3.5.2  h9ec8514_0           conda-forge     Cached                                                                                                                                                                                                  
  + libffi                                3.2.1  he1b5a44_1007        conda-forge       48kB                                                                                                                                                                                                  
  - libgcc                               15.2.0  h767d61c_7           conda-forge     Cached                                                                                                                                                                                                  
  + libgcc                                7.2.0  h69d50b8_2           conda-forge      312kB                                                                                                                                                                                                                                                                                                                                                  
  - libgcc-ng                            15.2.0  h69a702a_7           conda-forge     Cached                                                                                                                                                                                                  
  + libgcc-ng                             9.2.0  h24d8f2e_2           conda-forge        9MB                                                                                                                                                                                                                                                                                                                                                  
  - libgomp                              15.2.0  h767d61c_7           conda-forge     Cached                                                                                                                                                                                                  
  + libgomp                               9.2.0  h24d8f2e_2           conda-forge      835kB                                                                                                                                                                                                  
  - libsodium                            1.0.20  h4ab18f5_0           conda-forge     Cached                                                                                                                                                                                                  
  + libsodium                            1.0.18  h36c2ea0_1           conda-forge      375kB                                                                                                                                                                                                  
  - libstdcxx-ng                         15.2.0  h4852527_7           conda-forge     Cached                                                                                                                                                                                                                                                                                                                                                  
  + libstdcxx-ng                          9.2.0  hdf63c60_2           conda-forge        5MB                                                                                                                                                                                                  
  - libuuid                              2.41.2  he9a06e4_0           conda-forge     Cached                                                                                                                                                                                                                                                                                                                                                  
  + libuuid                              2.32.1  h14c3975_1000        conda-forge       27kB                                                                                                                                                                                                  
  - libuv                                1.51.0  hb03c661_1           conda-forge     Cached                                                                                                                                                                                                                                                                                                                                                  
  + libuv                                1.40.0  hd18ef5c_0           conda-forge      942kB                                                                                                                                                                                                                                                                                                                                                  
  - libzlib                               1.3.1  hb9d3cd8_2           conda-forge     Cached                                                                                                                                                                                                  
  + libzlib                              1.2.11  h36c2ea0_1013        conda-forge       60kB                                                                                                                                                                                                  
  - ncurses                                 6.5  h2d0b736_3           conda-forge     Cached                                                                                                                                                                                                  
  + ncurses                                 6.2  h58526e2_4           conda-forge        1MB                                                                                                                                                                                                  
  - nodejs                              20.19.5  hf7ee748_0           conda-forge     Cached                                                                                                                                                                                                                                                                                                                                                  
  + nodejs                               15.3.0  h25f6087_0           conda-forge       16MB                                                                                                                                                                                                                                                                                                                                                  
  - notebook                              7.4.5  pyhd8ed1ab_0         conda-forge     Cached                                                                                                                                                                                                                                                                                                                                                  
  + notebook                              6.5.7  pyha770c72_0         conda-forge      309kB                                                                                                                                                                                                                                                                                                                                                  
  - openssl                               3.5.4  h26f9b46_0           conda-forge     Cached                                                                                                                                                                                                                                                                                                                                                  
  + openssl                              1.1.1h  h516909a_0           conda-forge        2MB                                                                                                                                                                                                                                                                                                                                                  
  - psutil                                7.0.0  py39h8cd3c5a_0       conda-forge     Cached                                                                                                                                                                                                                                                                                                                                                  
  + psutil                                5.7.3  py39h38d8fee_0       conda-forge      348kB                                                                                                                                                                                                                                                                                                                                                  
  - pydantic                             2.11.7  pyh3cfb1c2_0         conda-forge     Cached                                                                                                                                                                                                                                                                                                                                                  
  + pydantic                              1.7.2  py39hbd71b63_0       conda-forge        2MB                                                                                                                                                                                                                                                                                                                                                  
  - pyjwt                                2.10.1  pyhd8ed1ab_0         conda-forge     Cached                                                                                                                                                                                                                                                                                                                                                  
  + pyjwt                                 2.0.1  pyhd8ed1ab_0         conda-forge       17kB                                                                                                                                                                                                                                                                                                                                                  
  - python                               3.9.23  hc30ae73_0_cpython   conda-forge     Cached                                                                                                                                                                                                                                                                                                                                                  
  + python                                3.9.0  h2a148a8_4_cpython   conda-forge       25MB                                                                                                                                                                                                                                                                                                                                                  
  - pyyaml                                6.0.2  py39h9399b63_2       conda-forge     Cached                                                                                                                                                                                                                                                                                                                                                  
  + pyyaml                                5.3.1  py39h38d8fee_1       conda-forge      195kB                                                                                                                                                                                                                                                                                                                                                  
  - pyzmq                                27.0.2  py39haa5fa38_0       conda-forge     Cached                                                                                                                                                                                                                                                                                                                                                  
  + pyzmq                                20.0.0  py39h25affbc_1       conda-forge      508kB                                                                                                                                                                                                                                                                                                                                                  
  - readline                                8.2  h8c095d6_2           conda-forge     Cached                                                                                                                                                                                                                                                                                                                                                  
  + readline                                8.0  he28a2e2_2           conda-forge      288kB                                                                                                                                                                                                                                                                                                                                                  
  - sqlalchemy                           2.0.43  py39hd399759_0       conda-forge     Cached                                                                                                                                                                                                                                                                                                                                                  
  + sqlalchemy                           1.3.20  py39h07f9747_0       conda-forge        2MB                                                                                                                                                                                                                                                                                                                                                  
  - tk                                   8.6.13  noxft_hd72426e_102   conda-forge     Cached                                                                                                                                                                                                                                                                                                                                                  
  + tk                                   8.6.11  h21135ba_0           conda-forge        3MB                                                                                                                                                                                                                                                                                                                                                  
  - tornado                               6.5.2  py39hd399759_0       conda-forge     Cached                                                                                                                                                                                                                                                                                                                                                  
  + tornado                                 6.1  py39hbd71b63_0       conda-forge      664kB                                                                                                                                                                                                                                                                                                                                                  
  - urllib3                               2.5.0  pyhd8ed1ab_0         conda-forge     Cached                                                                                                                                                                                                                                                                                                                                                  
  + urllib3                               2.2.2  pyhd8ed1ab_0         conda-forge       95kB                                                                                                                                                                                                                                                                                                                                                  
  - zeromq                                4.3.5  h387f397_9           conda-forge     Cached                                                                                                                                                                                                                                                                                                                                                  
  + zeromq                                4.3.3  h58526e2_3           conda-forge      295kB                                                                                                                                                                                                                                                                                                                                                  
  - zlib                                  1.3.1  hb9d3cd8_2           conda-forge     Cached                                                                                                                                                                                                                                                                                                                                                  
  + zlib                                 1.2.11  h36c2ea0_1013        conda-forge       88kB                                                                                                                                                                                                                                                                                                                                                  
  - zstandard                            0.23.0  py39hd399759_3       conda-forge     Cached                                                                                                                                                                                                                                                                                                                                                  
  + zstandard                            0.14.0  py39hf149a3a_3       conda-forge      613kB                                                                                                                                                                                                                                                                                                                                                  

  Summary:                                                                                                                                                                                                                                                                                                                                                                                                                                    

  Install: 33 packages                                                                                                                                                                                                                                                                                                                                                                                                                        
  Remove: 12 packages                                                                                                                                                                                                                                                                                                                                                                                                                         
  Change: 4 packages                                                                                                                                                                                                                                                                                                                                                                                                                          
  Downgrade: 52 packages                                                                                                                                                                                                                                                                                                                                                                                                                      

  Total download: 373MB                                                                                                                                                                                                                                                                                                                                                                                                                       

──────────────────────────────────────────────────────────────────────────────────────────────                                                                                                                                                                                                                                                                                                                                                


Dry run. Not executing the transaction.                                                                                                                                                                                                                                                                                                                                                                                                       
./build/micromamba/micromamba env update -p /tmp/env -f /tmp/downgrade.yml --dry-run  18.51s user 0.22s system 99% cpu 18.828 total

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