使用cache加快编译速度的命令详解
网络编程
Ubuntu 安装ccache
- sudo apt-get install ccache
- 安装完后确认安装执行which ccache
$ which ccache/usr/bin/ccache
3.在 ~/.bashrc 或者 ~/.zshrc文件内追加以下内容
# ccacheexport USE_CCACHE=1export CCACHE_SLOPPINESS=file_macro,include_file_mtime,time_macrosexport CCACHE_UMASK=002
source /.bashrc或者/.zshrc
4. ccache默认设置的5G磁盘空间，正常来说够用，如果担心不够可以改大一些,
ccache -M 30G
5. 通过版本确认安装成功
$ ccache --versionccache version 3.4.1Copyright (C) 2002-2007 Andrew TridgellCopyright (C) 2009-2018 Joel Rosdahl
6.可以通过ccache -s查看当前配置
cache directory /home/username/.ccacheprimary config /home/username/.ccache/ccache.confsecondary config (readonly) /etc/ccache.confstats zero time Fri Jul 22 16:15:40 2022cache hit (direct) 4186cache hit (preprocessed) 875cache miss 1069cache hit rate 82.56 %called for link 653cleanups performed 0files in cache 3209cache size 159.3 MBmax cache size 30.0 GB
使用libzmq测试ccache
1.通过github下载 libzmq的源码
$ git clone https://github.com/zeromq/libzmq.gitCloning into 'libzmq'...remote: Enumerating objects: 43791, done.remote: Counting objects: 100% (36/36), done.remote: Compressing objects: 100% (28/28), done.remote: Total 43791 (delta 11), reused 24 (delta 8), pack-reused 43755Receiving objects: 100% (43791/43791), 21.91 MiB | 1.03 MiB/s, done.Resolving deltas: 100% (31951/31951), done.
2.在 libzmq目录内建立 build目录
3.修改CMakeLists.txt, '+'后面的代表新增
──────┬─────────────────────────────────────────────────────────────────────────────────────── │ File: CMakeLists.txt───────┼────────────────────────────────────────────────────────────────────────────────────── 1 │ # CMake build script for ZeroMQ 2 │ project(ZeroMQ) 3 │ 4 │ if(${CMAKE_SYSTEM_NAME} STREQUAL Darwin) 5 │ cmake_minimum_required(VERSION 3.0.2) 6 │ else() 7 │ cmake_minimum_required(VERSION 2.8.12) 8 │ endif() 9 │ 10 + │ find_program(CCACHE_FOUND ccache) 11 + │ if(CCACHE_FOUND) 12 + │ set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE ccache) 13 + │ set_property(GLOBAL PROPERTY RULE_LAUNCH_LINK ccache) 14 + │ message(STATUS "use ccache") 15 + │ endif(CCACHE_FOUND) 16 + │ 17 │ include(CheckIncludeFiles)4.在build目录执行cmake ..
打印显示 -- use ccache 表示启用ccache，但需要注意的事，每个项目在第一次启用ccache时，不会加快编译速度，而是把编译缓存保存到 /home/username/.ccache目录，供以后编译使用
$ cmake ..-- The C compiler identification is GNU 7.5.0-- The CXX compiler identification is GNU 7.5.0-- Check for working C compiler: /usr/bin/cc-- Check for working C compiler: /usr/bin/cc -- works-- Detecting C compiler ABI info-- Detecting C compiler ABI info - done-- Detecting C compile features-- Detecting C compile features - done-- Check for working CXX compiler: /usr/bin/c++-- Check for working CXX compiler: /usr/bin/c++ -- works-- Detecting CXX compiler ABI info-- Detecting CXX compiler ABI info - done-- Detecting CXX compile features-- Detecting CXX compile features - done-- use ccache-- Looking for pthread.h-- Looking for pthread.h - found-- Looking for pthread_create-- Looking for pthread_create - not found-- Looking for pthread_create in pthreads-- Looking for pthread_create in pthreads - not found-- Looking for pthread_create in pthread-- Looking for pthread_create in pthread - found-- Found Threads: TRUE ...
5.使用 /usr/bin/time命令来记录编译耗费的时间
/usr/bin/time make -j3result:48.79user 14.25system 0:21.60elapsed 291%CPU (0avgtext+0avgdata 176036maxresident)k0inputs+282248outputs (0major+2406923minor)pagefaults 0swaps
6.rm -rf * 删除build目录内的所有文件
7.重新 cmake ..
8.使用 /usr/bin/time命令来记录编译耗费的时间
/usr/bin/time make -j3result:2.78user 2.42system 0:02.15elapsed 241%CPU (0avgtext+0avgdata 23736maxresident)k0inputs+21744outputs (0major+232849minor)pagefaults 0swaps
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