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Behdad Esfahbod f5d619be79 [ot-tags] Further gate the slow complex case, and add more tests 
Part of https://github.com/harfbuzz/harfbuzz/issues/3591

Still 'zh-trad' is the slowest case.

--------------------------------------------------------------------------------------------------
Benchmark                                                        Time             CPU   Iterations
--------------------------------------------------------------------------------------------------
BM_hb_ot_tags_from_script_and_language/COMMON zh_trad          136 ns          136 ns      5107838
BM_hb_ot_tags_from_script_and_language/COMMON ab_abcd          115 ns          115 ns      6103104
BM_hb_ot_tags_from_script_and_language/COMMON ab_abc          25.4 ns         25.3 ns     27674482
BM_hb_ot_tags_from_script_and_language/COMMON abcdef_XY       20.2 ns         20.1 ns     34795719
BM_hb_ot_tags_from_script_and_language/COMMON abcd_XY         19.4 ns         19.3 ns     36390401
BM_hb_ot_tags_from_script_and_language/COMMON cxy_CN          33.5 ns         33.4 ns     20998939
BM_hb_ot_tags_from_script_and_language/COMMON exy_CN          25.1 ns         25.0 ns     27705832
BM_hb_ot_tags_from_script_and_language/COMMON zh_CN           34.2 ns         34.1 ns     20564356
BM_hb_ot_tags_from_script_and_language/COMMON en_US           15.5 ns         15.5 ns     45032204
BM_hb_ot_tags_from_script_and_language/LATIN en_US            15.9 ns         15.8 ns     44412379
BM_hb_ot_tags_from_script_and_language/COMMON none            4.72 ns         4.71 ns    149101665
BM_hb_ot_tags_from_script_and_language/LATIN none             4.72 ns         4.70 ns    149254498
 		2022-05-18 11:04:52 -06:00
..
fonts [perf] Make subset benchmark data driven. 2022-05-10 14:30:08 -06:00
texts Rename HBGlyphID to HBGlyphID16 2021-09-19 16:30:12 -04:00
Makefile.am [perf] Add benchmark-ot 2022-05-17 13:12:17 -06:00
README.md [perf] Add missing ninja command in profiling instructions. 2022-04-21 11:16:12 -06:00
benchmark-font.cc [perf/benchmark-font] Test Roboto as variable even though it's not 2022-05-16 17:49:36 -06:00
benchmark-map.cc [benchmark-map] Remove rand() overhead from benchmark 2022-04-29 13:14:41 -06:00
benchmark-ot.cc [ot-tags] Further gate the slow complex case, and add more tests 2022-05-18 11:04:52 -06:00
benchmark-set.cc [benchmark-set] Split SetLookup into an ordered and random version 2022-04-29 13:39:15 -06:00
benchmark-shape.cc [perf/benchmark-font] Parametrize test 2022-05-02 14:03:15 -06:00
benchmark-subset.cc [perf/benchmark-subset] Minor cleanup 2022-05-11 12:14:49 -06:00
meson.build [perf] Add benchmark-ot 2022-05-17 13:12:17 -06:00
run.sh [perf] More rename 2019-12-10 12:43:42 -06:00

README.md

Building and Running

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.

Profiling

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