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perf 火焰图分析程序性能
source link: http://abcdxyzk.github.io/blog/2021/06/06/debug-perf-flame/
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perf 火焰图分析程序性能
2021-06-06 22:35:00
https://www.cnblogs.com/happyliu/p/6142929.html
使用火焰图展示结果
1、Flame Graph项目位于GitHub上：https://github.com/brendangregg/FlameGraph
2、可以用git将其clone下来：git clone https://github.com/brendangregg/FlameGraph.git
我们以perf为例，看一下flamegraph的使用方法：
1、第一步
sudo perf record -e cpu-clock -g -p 28591Ctrl+c结束执行后，在当前目录下会生成采样数据perf.data.
2、第二步
用perf script工具对perf.data进行解析
perf script -i perf.data &> perf.unfold3、第三步
将perf.unfold中的符号进行折叠：
./stackcollapse-perf.pl perf.unfold &> perf.folded4、最后生成svg图：
./flamegraph.pl perf.folded > perf.svgPosted by kk
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