How to enable ccache on Linux - linux

Question

There is very little documentation on enabling ccache on GNU/Linux. Here is a response from launchpad.net:
At the moment, I think the best way to enable ccache is to add
"/usr/lib/ccache" to the front of your path. If you want to enable it
for all users by default, change the PATH variable in
/etc/environment.
Can someone give me more information on enabling ccache?

Answer 1

Download latest version of ccache for better performance.
After Downloading, Follow the steps as mentioned below:
A) Tar the file using the following command :
$tar -xvf ccache-3.2.4.tar.bz2
Note : I'm using ccache 3.2.4 Version.You can download the latest one.
B) Go inside ccache-3.2.4 folder and run the following commands:
$./configure
$./make
$ sudo make install
C) Go to your .bashrc and insert the following :
export CCACHE_DIR=/home/user_name/.ccache
export CCACHE_TEMPDIR=/home/user_name/.ccache
Note : Fill user_name with your User Name
D) Save your Bashrc and source it
$ source ~/.bashrc
E) To check ccache is working or not type :
ccache -M 10G : To Set the ccache Size to 10GB
F) To check ccache is working or not type :
ccache -s : To check ccache statistics

Answer 2

There are at least two methods:
i) Override the CC, CXX, ... flags in a Makefile. Within the R framework, a system and optional user configuration file is read, and I simply set
VER=4.7
CC=ccache gcc-$(VER)
CXX=ccache g++-$(VER)
SHLIB_CXXLD=g++-$(VER)
FC=ccache gfortran
F77=ccache gfortran
which also allows me to switch back and forth between gcc versions. Now all compilations involving R use ccache.
ii) For other uses, I have deployed the fact that /usr/local/bin/ is checked prior to /usr/bin. So one can do
root#max:/usr/local/bin# ls -l gcc
lrwxrwxrwx 1 root root 15 Jan 27 11:04 gcc -> /usr/bin/ccache
root#max:/usr/local/bin# ./gcc --version
gcc (Ubuntu/Linaro 4.7.2-2ubuntu1) 4.7.2
Copyright (C) 2012 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
root#max:/usr/local/bin#
and now gcc is invoked via ccache:
edd#max:/tmp$ cp -vax ~/src/progs/C/benfordsLaw.c .
`/home/edd/src/progs/C/benfordsLaw.c' -> `./benfordsLaw.c'
edd#max:/tmp$ time /usr/local/bin/gcc -c benfordsLaw.c
real 0m0.292s
user 0m0.052s
sys 0m0.012s
edd#max:/tmp$ time /usr/local/bin/gcc -c benfordsLaw.c
real 0m0.026s
user 0m0.004s
sys 0m0.000s
edd#max:/tmp$

Answer 3

The ccache manual has a section called Run modes which describes the official ways of activating ccache, so I suggest reading the manual.
Also, as you already noted, Linux distributions often set up a /usr/lib/ccache directory which is designed to be prepended to PATH.

Answer 4

Another possibility (instead of export CC=ccache commented by Keltar), if $HOME/bin/ is listed in your $PATH before /usr/bin/, would be to make a symlink
ln -s /usr/bin/ccache $HOME/bin/gcc
Then every execvp(3) of gcc would find that symlink

Answer 5

Ubuntu install ccache
sudo apt-get install ccache
Confirm installation execution after installation "which ccache"
$ which ccache
/usr/bin/ccache
Add the following contents to the "~/.bashrc" or "~/.zshrc==" file
# ccache
export USE_CCACHE=1
export CCACHE_SLOPPINESS=file_macro,include_file_mtime,time_macros
export CCACHE_UMASK=002
source "~/.bashrc" or "~/.zshrc"
4. The 5 GB disk space set by default for ccache is normally enough. If you are worried about it, you can increase it, ccache -M 30G
5. Confirm successful installation through version
$ ccache --version
ccache version 3.4.1
Copyright (C) 2002-2007 Andrew Tridgell
Copyright (C) 2009-2018 Joel Rosdahl
You can view the current configuration through ccache - s
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
Use libzmq to test ccache
Through github download the source code of libzmq
$ 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.
Create the build directory in the libzmq directory
Modify CMakeLists. txt , '+' to add
──────┬───────────────────────────────────────────────────────────────────────────────────────
│ 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)
Execute "cmake .." In the build directory
Print and display **"-- use ccache" **means enable ccache, but note that when each project is enabled ccache for the first time, it will not speed up the compilation speed, but save the compilation cache to the "/home/username/. cache" directory for later compilation
$ 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
...
Use the "/usr/bin/time" command to record the compilation time
/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
"rm - rf *" delete build all files in the directory
cmake ..
Use the "/usr/bin/time" command to record the compilation time
/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
https://www.cnblogs.com/jiangyibo/p/16516932.html