rust-analyzer and vscode settings for fast code navigation and building

README.md

Base system

16Gb RAM laptop with 16 cpu kernels

settings.json for vscode in project

{
    // "rust-analyzer.completion.limit": 10,
    // "rust-analyzer.workspace.symbol.search.limit": 50,
    "rust-analyzer.workspace.symbol.search.scope": "workspace_and_dependencies",
    "rust-analyzer.imports.preferPrelude": true,
    "rust-analyzer.imports.preferNoStd": false,
    "rust-analyzer.imports.merge.glob": false,
    "rust-analyzer.imports.granularity.group": "crate",
    "rust-analyzer.imports.granularity.enforce": false,
    "rust-analyzer.hover.actions.enable": true,
    "rust-analyzer.hover.actions.implementations.enable": true,
    "rust-analyzer.hover.actions.references.enable": true,
    "rust-analyzer.hover.actions.run.enable": false,
    "rust-analyzer.hover.actions.debug.enable": false,
    "rust-analyzer.completion.privateEditable.enable": true,
    "rust-analyzer.diagnostics.experimental.enable": false,
    "rust-analyzer.diagnostics.enable": true,
    "rust-analyzer.lens.enable": true,
    "rust-analyzer.check.command": "check",
    "rust-analyzer.runnables.extraTestBinaryArgs": [
        "--nocapture",
        "--test-threads=1"
    ],
    "rust-analyzer.cargo.features": "all",
    "rust-analyzer.completion.autoself.enable": true,
    "rust-analyzer.completion.autoimport.enable": true,
    "rust-analyzer.server.extraEnv": {
        "CARGO_TARGET_DIR": "target/rust-analyzer",
        "RA_PROFILE": "IntelliJ"
    },
    "rust-analyzer.lru.capacity": 1024,
    "rust-analyzer.cachePriming.enable": true,
    "rust-analyzer.cachePriming.numThreads": 12,
    "rust-analyzer.numThreads": 12,
    "rust-analyzer.checkOnSave": true,
    "rust-analyzer.check.workspace": true,
    "rust-analyzer.check.allTargets": true,
    "rust-analyzer.cargo.buildScripts.enable": true,
    "rust-analyzer.procMacro.enable": true,
    // "rust-analyzer.check.extraArgs": [
    //     // "--lib",
    //     "--bins"
    // ],
    /////////////////////////
    "editor.hover.sticky": true,
    "editor.hover.delay": 100,
    "editor.hover.enabled": true,
    "editor.parameterHints.cycle": true,
    "editor.suggest.filterGraceful": false,
    "editor.gotoLocation.multipleDefinitions": "goto",
    "editor.gotoLocation.multipleTypeDefinitions": "goto",
    "editor.gotoLocation.multipleImplementations": "peek",
    "editor.gotoLocation.multipleReferences": "peek",
    "editor.inlineSuggest.enabled": true,
    "editor.peekWidgetDefaultFocus": "editor",
    "search.searchOnType": true,
    "search.searchOnTypeDebouncePeriod": 300,
    "files.watcherExclude": {
        "**/target/**": true,
        "**/node_modules/**": true,
        "**/.git/objects/**": true,
        "**/.git/subtree-cache/**": true,
        "**/build/**": true,
        "**/dist/**": true
    },
    "search.exclude": {
        "**/target": true,
        "**/node_modules": true,
        "**/.git": true
    },
    "editor.minimap.enabled": false,
    "breadcrumbs.enabled": true,
    "editor.renderWhitespace": "none",
    "editor.renderControlCharacters": true,
    "editor.renderLineHighlight": "all",
    "problems.decorations.enabled": true,
    "editor.quickSuggestions": {
        "other": true,
        "comments": true,
        "strings": true
    },
    "editor.quickSuggestionsDelay": 100,
    "editor.suggest.insertMode": "replace",
    "editor.suggest.localityBonus": true,
    "editor.suggest.shareSuggestSelections": false,
    "git.enabled": false,
    "git.autorefresh": false,
    "git.decorations.enabled": false,
    "terminal.integrated.gpuAcceleration": "auto",
    /////////////////////////
    "lldb.displayFormat": "auto",
    "lldb.showDisassembly": "never",
    "lldb.dereferencePointers": true,
    "lldb.consoleMode": "evaluate",
    "java.autobuild.enabled": false,
    "java.errors.incompleteClasspath.severity": "ignore",
    "java.server.launchMode": "LightWeight",
    "java.project.sourcePaths": [
        "client"
    ],
    "markdown-preview-enhanced.plantumlJarPath": "/home/i3draven/fun/Rust/degu/tools/plantuml.jar"
}

cat /etc/sysctl.d/99-rust-dev.conf

vm.swappiness=1                  
vm.vfs_cache_pressure=50          
vm.dirty_ratio=15                 
vm.dirty_background_ratio=5       
vm.max_map_count=2097152       

swap (as I remember it, check)

For ubuntu 25.10, installation steps

Compressed RAM

sudo apt install zram-config

Compressed swap volume

sudo apt install vdo lvm2
sudo systemctl enable vdo.service
sudo systemctl start vdo.service
sudo lvcreate --type vdo -L 31G -V 31G --compression y --deduplication n vg/lv_swap
sudo mkswap /dev/vg/lv_swap
sudo blkid /dev/vg/lv_swap

/etc/fstab

#/swapfile                                 none            swap    sw              0       0
UUID=${your_swap_id} none swap sw 0 0

LMV volume starts before fstab

sudo systemctl edit dev-vg-lvol0-swap.service

[Unit]
Description=Activate LVM volumes before mounting filesystems
DefaultDependencies=no
Before=local-fs-pre.target
After=systemd-udev-settle.service

[Service]
Type=oneshot
ExecStart=/usr/sbin/vgchange -ay

[Install]
WantedBy=local-fs-pre.target

Cargo preferences

install sccache

cargo install sccache

Add sccache as wraper around rustc

nano ~/.cargo/config.toml

[build]
jobs = 12  # 3/4 CPU kernels
rustc-wrapper = "sccache"

[target.x86_64-unknown-linux-gnu]
linker = "clang"
rustflags = ["-C", "link-arg=-fuse-ld=lld"]

[profile.dev]
debug = 1
incremental = true

[profile.release]
lto = "thin"
codegen-units = 1

launch.json in project in vscode

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Debug",
            "type": "lldb",
            "request": "launch",
            "program": "${workspaceRoot}/target/debug/project",
            "args": [],
            "env": {
                "RUST_BACKTRACE": "1",
                "RUST_LOG": "debug,h2=info,tower_http=debug"
            },
            "cwd": "${workspaceRoot}",
            "stopOnEntry": false,
            "preLaunchTask": "rust: cargo build",
            "sourceLanguages": [
                "rust"
            ]
        }
    ]
}

important setting is sourceLanguages

Better extensions for vscode

1. CodeLLDB
2. ANSI colors
3. Better Comments
4. CodeViz Stat
5. Dependi
6. Error lens
7. Even better Toml
8. Log File Highlighter - tail functions
9. Meramaid chart
10. Open file
11. Rust mod generator
12. rust-analyzer
13. Code spell checker