task1: 最简单的 on-cpu 火焰图

首先生成最简单的 on-cpu 火焰图，参考 https://www.bilibili.com/video/BV1hg4y1o7Sb/?spm_id_from=333.337.search-card.all.click&vd_source=7a1a0bc74158c6993c7355c5490fc600

首先安装工具，这似乎是 Linux 自带的工具

sudo apt install linux-tools-common
sudo apt install linux-tools-generic

接着，生成 perf record

sudo perf record -F 99 -g ./test -- sleep 60
perf script -i perf.data > out.perf

再生成火焰图

./FlameGraph/stackcollapse-perf.pl out.perf > out.floded
./FlameGraph/flamegraph.pl out.floded > cp.svg

task2: 差分火焰图
参考：https://zhuanlan.zhihu.com/p/639996512

 sudo perf record -F 99 -g ./test -- sleep 60sudo perf script -i perf.data > A.stackssudo perf record -F 99 -g ./test -- sleep 60sudo perf script -i perf.data > B.stacks
./stackcollapse-perf.pl ../A.stacks > A.folded
./stackcollapse-perf.pl ../B.stacks > B.folded
# 基于折叠结果做差
./difffolded.pl A.folded B.folded > diff.folded
# 生成差分火焰图
./flamegraph.pl diff.folded > diff.svg