Benchmarks are implemented using Google Benchmark.
To build the benchmarks in this directory you need to set the benchmark option while configuring the build with meson:
meson configure build -Dbenchmark=enabled --buildtype=release
Then build the benchmark binaries with ninja:
ninja -Cbuild perf/benchmark-set
Finally, to run one of the benchmarks:
./build/perf/benchmark-set
It's possible to filter the benchmarks being run and customize the output via flags to the benchmark binary. See the Google Benchmark User Guide for more details.
Configure the build to include debug information for profiling:
CXXFLAGS="-fno-omit-frame-pointer" meson --reconfigure build -Dbenchmark=enabled --buildtype=debug ninja -Cbuild
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