cargo flamegraph

有如下选项：

¶ 运行指定binnary

-b your-binnary

¶ 指定采样频率

-F xxx

单位好像是Hz

¶ 传参

-- your-arg your-value

¶ 传入perf参数

-c "要给perf的参数

比如

cargo flamegraph -c "record -e branch-misses -c 100 --call-graph lbr -g"

¶ 例子

cargo flamegraph -F 1 --bin transaction-replayer -- --perf-log data/perf-log.txt

cargo flamegraph -c "recor
d -a -F 1 --call-graph=dwarf" --bin transaction-replayer -- --start-epoch 18000000 --epoch-to-execute 1000000 --commit-interval 10000

注意用了-c时，-F 1要放到-c后面的perf参数里。

¶ 常见错误的处理

could not spawn perf

sudo apt install linux-tools-common

WARNING: perf not found for kernel 4.15.0-144

  You may need to install the following packages for this specific kernel:
    linux-tools-4.15.0-144-generic
    linux-cloud-tools-4.15.0-144-generic

  You may also want to install one of the following packages to keep up to date:
    linux-tools-generic
    linux-cloud-tools-generic
failed to sample program

按照提示安装即可：

sudo apt install linux-tools-4.15.0-144-generic linux-cloud-tools-4.15.0-144-generic linux-tools-generic linux-cloud-tools-generic

¶ 参考文献

ubuntu18.04安装perf
https://github.com/brendangregg/FlameGraph/issues/209
https://github.com/flamegraph-rs/flamegraph