Jo Voordeckers jayv
sgielen
/ CMakeLists.txt
Created
February 5, 2017 11:39
Building kernel with CMake, clang and binutils ld
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| cmake_minimum_required(VERSION 2.8.12) | |
| project(MyKernel C CXX ASM) | |
| # ... | |
| add_executable(mykernel boot.s kernel_main.cpp) # + other source files | |
| set_target_properties(mykernel PROPERTIES LINK_DEPENDS "${CMAKE_SOURCE_DIR}/linker.ld") | |
| set_target_properties(mykernel PROPERTIES LINK_FLAGS "-T ${CMAKE_SOURCE_DIR}/linker.ld") |
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| pbpaste | highlight -O rtf /dev/stdin --font-size 34 --font Menlo --style molokai -W -J 80 -j 3 --src-lang java | pbcopy |
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| Latency Comparison Numbers (~2012) | |
| ---------------------------------- | |
| L1 cache reference 0.5 ns | |
| Branch mispredict 5 ns | |
| L2 cache reference 7 ns 14x L1 cache | |
| Mutex lock/unlock 25 ns | |
| Main memory reference 100 ns 20x L2 cache, 200x L1 cache | |
| Compress 1K bytes with Zippy 3,000 ns 3 us | |
| Send 1K bytes over 1 Gbps network 10,000 ns 10 us | |
| Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD |