profile.md

title
性能检测

Google gperftools

安装

git clone https://github.com/gperftools/gperftools.git
cd gperftools
./autogen.sh
./configure
make
sudo make install

链接

c++ -o <executable-file> <source-files> -Wl,--no-as-needed,-lprofiler,--as-needed

运行

CPUPROFILE=<path-to-profile-file> <path-to-executable-file>

报告

pprof [options] <path-to-executable-file> <path-to-profile-file(s)>
# options:
#    --text              Generate text report
#    --gv                Generate Postscript and display
#    --evince            Generate PDF and display
#    --web               Generate SVG and display

GNU gprof

⚠️ 仅在 Linux 系统中可用。

编译

编译、链接时，开启 -pg 选项：

cc -c myprog.c -g -pg
cc -o myprog myprog.o -pg
# 或
cc -o myprog myprog.c -g -pg

运行

运行程序，生成二进制文件 gmon.out：

./myprog

报告

gprof options [executable-file [profile-data-files...]] [> outfile]
# 纯文字报告：-p 或 --flat-profile
gprof -p myprog gmon.out > flat-report
# 图形化报告：-q 或 --graph
gprof -q myprog gmon.out > graph-report

Linux perf

CPU Flame Graphs

git clone https://github.com/brendangregg/FlameGraph  # or download it from github
cd FlameGraph
FLAMEGRAPH=$PWD

cd <directory-of-exe>
perf record -g ./<exe> [argv]  # 生成 perf.data
perf script | $FLAMEGRAPH/stackcollapse-perf.pl > out.perf-folded
$FLAMEGRAPH/flamegraph.pl out.perf-folded > perf.svg