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[perf] Update readme with profiling instructions.

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Garret Rieger 2022-04-20 22:31:26 +00:00 committed by Behdad Esfahbod
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commit a5cf917892
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perf/README.md
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# Building and Running
Benchmarks are implemented using [Google Benchmark](https://github.com/google/benchmark). Benchmarks are implemented using [Google Benchmark](https://github.com/google/benchmark).
To build the benchmarks in this directory you need to set the benchmark To build the benchmarks in this directory you need to set the benchmark
@ -22,3 +24,22 @@ Finally, to run one of the benchmarks:
It's possible to filter the benchmarks being run and customize the output It's possible to filter the benchmarks being run and customize the output
via flags to the benchmark binary. See the via flags to the benchmark binary. See the
[Google Benchmark User Guide](https://github.com/google/benchmark/blob/main/docs/user_guide.md#user-guide) for more details. [Google Benchmark User Guide](https://github.com/google/benchmark/blob/main/docs/user_guide.md#user-guide) for more details.
# Profiling
Configure the build to include debug information for profiling:
```
CXXFLAGS="-fno-omit-frame-pointer" meson --reconfigure build -Dbenchmark=enabled --buildtype=debug
```
Then run the benchmark with perf:
```
perf record -g -o ~/tmp/profiles/subset.prof ./build/perf/benchmark-subset --benchmark_filter="BM_subset_codepoints/subset_notocjk/100000" --benchmark_repetitions=5
```
You probably want to filter to a specific benchmark of interest and set the number of repititions high enough to get a good sampling of profile data.
Finally view the profile with:
perf report -i ~/tmp/profiles/subset.prof