使用cache加快编译速度的命令详解
作者：皮皮酱
这篇文章主要介绍了使用cache加快编译速度的方法，主要讲解在Ubuntu 安装ccache，使用libzmq测试ccache的相关知识，本文给大家介绍的非常详细，对大家的学习或工作具有一定的参考借鉴价值,需要的朋友可以参考下
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
# ccache export USE_CCACHE=1 export CCACHE_SLOPPINESS=file_macro,include_file_mtime,time_macros export 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 --version ccache version 3.4.1 Copyright (C) 2002-2007 Andrew Tridgell Copyright (C) 2009-2018 Joel Rosdahl
6.可以通过ccache -s查看当前配置
cache directory /home/username/.ccache primary config /home/username/.ccache/ccache.conf secondary config (readonly) /etc/ccache.conf stats zero time Fri Jul 22 16:15:40 2022 cache hit (direct) 4186 cache hit (preprocessed) 875 cache miss 1069 cache hit rate 82.56 % called for link 653 cleanups performed 0 files in cache 3209 cache size 159.3 MB max 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.git Cloning 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 43755 Receiving 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 -j3 result: 48.79user 14.25system 0:21.60elapsed 291%CPU (0avgtext+0avgdata 176036maxresident)k 0inputs+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 -j3 result: 2.78user 2.42system 0:02.15elapsed 241%CPU (0avgtext+0avgdata 23736maxresident)k 0inputs+21744outputs (0major+232849minor)pagefaults 0swaps
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