[perf] hb_ot_tags_from_language() too slow #3591

behdad · 2022-05-17T19:18:57Z

[This was flagged by @matthiasclasen in https://gitlab.gnome.org/GNOME/gtk/-/issues/3334 https://gitlab.gnome.org/GNOME/gtk/uploads/a6da390ef2fd85d37dd594d88c4229ff/image.png]

The new perf/benchmark-ot shows this:

----------------------------------------------------------------------------------------------
Benchmark                                                    Time             CPU   Iterations
----------------------------------------------------------------------------------------------
BM_hb_ot_tags_from_script_and_language/COMMON zh_CN        172 ns          171 ns      4083155
BM_hb_ot_tags_from_script_and_language/COMMON en_US        120 ns          119 ns      5849947
BM_hb_ot_tags_from_script_and_language/LATIN en_US         113 ns          112 ns      5840326
BM_hb_ot_tags_from_script_and_language/COMMON none        4.66 ns         4.64 ns    151396224
BM_hb_ot_tags_from_script_and_language/LATIN none         4.66 ns         4.64 ns    149019593

Half of the time is spent in hb_ot_tags_from_complex_language(); in there, most of the time is spent in subtag_matches cases outside the switch. Ideas to speed that up:

Make subtag_matches use strchr for - instead of strstr as main loop. Might or might not have any effect.
All the subtag_matches outside the switch match long strings (>= 6 or so). As such, check the tag for such length before going into any of them.

I implementing the second.

After that, bulk of the time I suppose is spent in binary-searching the language table. I suggest we split the language table in 2-letter and 3-letter tags, to speed-up the vast majority of cases that are 2-letter.

The text was updated successfully, but these errors were encountered:

matthiasclasen · 2022-05-17T19:24:35Z

♥

Part of #3591 2. All the subtag_matches outside the switch match long strings (>= 6 or so). As such, check the tag for such length before going into any of them. benchmark-ot, before: ---------------------------------------------------------------------------------------------- Benchmark Time CPU Iterations ---------------------------------------------------------------------------------------------- BM_hb_ot_tags_from_script_and_language/COMMON zh_CN 172 ns 171 ns 4083155 BM_hb_ot_tags_from_script_and_language/COMMON en_US 120 ns 119 ns 5849947 BM_hb_ot_tags_from_script_and_language/LATIN en_US 113 ns 112 ns 5840326 BM_hb_ot_tags_from_script_and_language/COMMON none 4.66 ns 4.64 ns 151396224 BM_hb_ot_tags_from_script_and_language/LATIN none 4.66 ns 4.64 ns 149019593 After: ---------------------------------------------------------------------------------------------- Benchmark Time CPU Iterations ---------------------------------------------------------------------------------------------- BM_hb_ot_tags_from_script_and_language/COMMON zh_CN 112 ns 112 ns 6357763 BM_hb_ot_tags_from_script_and_language/COMMON en_US 60.5 ns 60.3 ns 11475091 BM_hb_ot_tags_from_script_and_language/LATIN en_US 54.9 ns 54.8 ns 12575690 BM_hb_ot_tags_from_script_and_language/COMMON none 4.61 ns 4.59 ns 152388450 BM_hb_ot_tags_from_script_and_language/LATIN none 4.66 ns 4.64 ns 151497600

behdad · 2022-05-17T19:36:06Z

2. All the subtag_matches outside the switch match long strings (>= 6 or so). As such, check the tag for such length before going into any of them.

I did this now. New numbers:

----------------------------------------------------------------------------------------------
Benchmark                                                    Time             CPU   Iterations
----------------------------------------------------------------------------------------------
BM_hb_ot_tags_from_script_and_language/COMMON zh_CN        112 ns          112 ns      6357763
BM_hb_ot_tags_from_script_and_language/COMMON en_US       60.5 ns         60.3 ns     11475091
BM_hb_ot_tags_from_script_and_language/LATIN en_US        54.9 ns         54.8 ns     12575690
BM_hb_ot_tags_from_script_and_language/COMMON none        4.61 ns         4.59 ns    152388450
BM_hb_ot_tags_from_script_and_language/LATIN none         4.66 ns         4.64 ns    151497600

dscorbett · 2022-05-17T20:29:42Z

I’ll start working on splitting the ot_languages table.

Part of #3591 "After that, bulk of the time I suppose is spent in binary-searching the language table. I suggest we split the language table in 2-letter and 3-letter tags, to speed-up the vast majority of cases that are 2-letter." benchmark-ot, before: ---------------------------------------------------------------------------------------------- Benchmark Time CPU Iterations ---------------------------------------------------------------------------------------------- BM_hb_ot_tags_from_script_and_language/COMMON zh_CN 112 ns 111 ns 6286271 BM_hb_ot_tags_from_script_and_language/COMMON en_US 60.6 ns 60.4 ns 11671176 BM_hb_ot_tags_from_script_and_language/LATIN en_US 61.3 ns 61.1 ns 11442645 BM_hb_ot_tags_from_script_and_language/COMMON none 4.75 ns 4.74 ns 146997235 BM_hb_ot_tags_from_script_and_language/LATIN none 4.65 ns 4.64 ns 150938747 After: ---------------------------------------------------------------------------------------------- Benchmark Time CPU Iterations ---------------------------------------------------------------------------------------------- BM_hb_ot_tags_from_script_and_language/COMMON zh_CN 89.5 ns 89.2 ns 7747649 BM_hb_ot_tags_from_script_and_language/COMMON en_US 38.5 ns 38.4 ns 18199432 BM_hb_ot_tags_from_script_and_language/LATIN en_US 39.0 ns 38.9 ns 18049238 BM_hb_ot_tags_from_script_and_language/COMMON none 4.53 ns 4.52 ns 154895110 BM_hb_ot_tags_from_script_and_language/LATIN none 4.54 ns 4.52 ns 154762105

behdad · 2022-05-17T20:30:42Z

I’ll start working on splitting the ot_languages table.

Done.

behdad · 2022-05-17T20:31:01Z

I’ll start working on splitting the ot_languages table.

Done.

After:

----------------------------------------------------------------------------------------------
Benchmark                                                    Time             CPU   Iterations
----------------------------------------------------------------------------------------------
BM_hb_ot_tags_from_script_and_language/COMMON zh_CN       89.5 ns         89.2 ns      7747649
BM_hb_ot_tags_from_script_and_language/COMMON en_US       38.5 ns         38.4 ns     18199432
BM_hb_ot_tags_from_script_and_language/LATIN en_US        39.0 ns         38.9 ns     18049238
BM_hb_ot_tags_from_script_and_language/COMMON none        4.53 ns         4.52 ns    154895110
BM_hb_ot_tags_from_script_and_language/LATIN none         4.54 ns         4.52 ns    154762105

behdad · 2022-05-17T20:31:35Z

Now perhaps looking into zh case would be wise.

Part of #3591 Before: ------------------------------------------------------------------------------------------------ Benchmark Time CPU Iterations ------------------------------------------------------------------------------------------------ BM_hb_ot_tags_from_script_and_language/COMMON abcd_XY 8.67 ns 8.64 ns 80324382 BM_hb_ot_tags_from_script_and_language/COMMON zh_CN 91.2 ns 90.9 ns 7674131 BM_hb_ot_tags_from_script_and_language/COMMON en_US 41.1 ns 41.0 ns 17174093 BM_hb_ot_tags_from_script_and_language/LATIN en_US 41.3 ns 41.2 ns 17000876 BM_hb_ot_tags_from_script_and_language/COMMON none 4.56 ns 4.55 ns 153914130 BM_hb_ot_tags_from_script_and_language/LATIN none 4.53 ns 4.52 ns 153830303 After: ------------------------------------------------------------------------------------------------ Benchmark Time CPU Iterations ------------------------------------------------------------------------------------------------ BM_hb_ot_tags_from_script_and_language/COMMON abcd_XY 8.24 ns 8.21 ns 84078465 BM_hb_ot_tags_from_script_and_language/COMMON zh_CN 77.5 ns 77.2 ns 9059230 BM_hb_ot_tags_from_script_and_language/COMMON en_US 38.8 ns 38.7 ns 17790692 BM_hb_ot_tags_from_script_and_language/LATIN en_US 37.6 ns 37.5 ns 18648293 BM_hb_ot_tags_from_script_and_language/COMMON none 4.50 ns 4.49 ns 155573267 BM_hb_ot_tags_from_script_and_language/LATIN none 4.49 ns 4.47 ns 156456653

Now that we know both strings are of equal len of 2 or 3, optimize. Part of #3591 Before: ------------------------------------------------------------------------------------------------ Benchmark Time CPU Iterations ------------------------------------------------------------------------------------------------ BM_hb_ot_tags_from_script_and_language/COMMON abcd_XY 8.50 ns 8.47 ns 81221549 BM_hb_ot_tags_from_script_and_language/COMMON zh_CN 79.6 ns 79.3 ns 8785804 BM_hb_ot_tags_from_script_and_language/COMMON en_US 40.0 ns 39.9 ns 17462768 BM_hb_ot_tags_from_script_and_language/LATIN en_US 39.2 ns 39.1 ns 17886793 BM_hb_ot_tags_from_script_and_language/COMMON none 4.31 ns 4.30 ns 162805417 BM_hb_ot_tags_from_script_and_language/LATIN none 4.32 ns 4.31 ns 162656688 After: ------------------------------------------------------------------------------------------------ Benchmark Time CPU Iterations ------------------------------------------------------------------------------------------------ BM_hb_ot_tags_from_script_and_language/COMMON abcd_XY 8.27 ns 8.24 ns 81868701 BM_hb_ot_tags_from_script_and_language/COMMON zh_CN 56.1 ns 56.0 ns 12353284 BM_hb_ot_tags_from_script_and_language/COMMON en_US 24.3 ns 24.2 ns 28955030 BM_hb_ot_tags_from_script_and_language/LATIN en_US 24.5 ns 24.4 ns 28664868 BM_hb_ot_tags_from_script_and_language/COMMON none 4.35 ns 4.34 ns 161190014 BM_hb_ot_tags_from_script_and_language/LATIN none 4.36 ns 4.34 ns 161319000

behdad · 2022-05-17T21:20:53Z

Now down to:

------------------------------------------------------------------------------------------------
Benchmark                                                      Time             CPU   Iterations
------------------------------------------------------------------------------------------------
BM_hb_ot_tags_from_script_and_language/COMMON abcd_XY       8.27 ns         8.24 ns     81868701
BM_hb_ot_tags_from_script_and_language/COMMON zh_CN         56.1 ns         56.0 ns     12353284
BM_hb_ot_tags_from_script_and_language/COMMON en_US         24.3 ns         24.2 ns     28955030
BM_hb_ot_tags_from_script_and_language/LATIN en_US          24.5 ns         24.4 ns     28664868
BM_hb_ot_tags_from_script_and_language/COMMON none          4.35 ns         4.34 ns    161190014
BM_hb_ot_tags_from_script_and_language/LATIN none           4.36 ns         4.34 ns    161319000

behdad · 2022-05-17T21:22:07Z

Calling this fixed for now.

behdad · 2022-05-17T21:35:37Z

Seems like the zh case is just the worst-case of the bsearch where en gets rather lucky. If I disable the bsearch, both zh and en become the same as abcd at 8ns.

behdad · 2022-05-17T21:40:19Z

So we're bsearch-bound now, and the cmp of it is fully optimized now.

A way to vastly speed up the case for 2-letter languages is to use a sparse array of 26x26 letters. Currently there's maximum three tags per language, so 9 bytes x 26 x 26 is required for that table, ~6kb, vs around 1.6kb currently.

Using an integer tag to bsearch, instead of string. Part of: #3591 Before: ------------------------------------------------------------------------------------------------ Benchmark Time CPU Iterations ------------------------------------------------------------------------------------------------ BM_hb_ot_tags_from_script_and_language/COMMON abcd_XY 8.11 ns 8.08 ns 87067795 BM_hb_ot_tags_from_script_and_language/COMMON zh_CN 53.6 ns 53.5 ns 13042418 BM_hb_ot_tags_from_script_and_language/COMMON en_US 24.2 ns 24.1 ns 29052731 BM_hb_ot_tags_from_script_and_language/LATIN en_US 24.4 ns 24.3 ns 28736769 BM_hb_ot_tags_from_script_and_language/COMMON none 4.43 ns 4.41 ns 160370413 BM_hb_ot_tags_from_script_and_language/LATIN none 4.35 ns 4.34 ns 160578191 After: ------------------------------------------------------------------------------------------------ Benchmark Time CPU Iterations ------------------------------------------------------------------------------------------------ BM_hb_ot_tags_from_script_and_language/COMMON abcd_XY 7.97 ns 7.95 ns 85208363 BM_hb_ot_tags_from_script_and_language/COMMON zh_CN 41.7 ns 41.6 ns 16945817 BM_hb_ot_tags_from_script_and_language/COMMON en_US 16.1 ns 16.0 ns 43613523 BM_hb_ot_tags_from_script_and_language/LATIN en_US 16.5 ns 16.4 ns 42568107 BM_hb_ot_tags_from_script_and_language/COMMON none 4.30 ns 4.29 ns 164055469 BM_hb_ot_tags_from_script_and_language/LATIN none 4.29 ns 4.27 ns 163793591

behdad · 2022-05-17T21:52:50Z

I made the bsearch use integer instead of string. Now:

------------------------------------------------------------------------------------------------
Benchmark                                                      Time             CPU   Iterations
------------------------------------------------------------------------------------------------
BM_hb_ot_tags_from_script_and_language/COMMON abcd_XY       7.97 ns         7.95 ns     85208363
BM_hb_ot_tags_from_script_and_language/COMMON zh_CN         41.7 ns         41.6 ns     16945817
BM_hb_ot_tags_from_script_and_language/COMMON en_US         16.1 ns         16.0 ns     43613523
BM_hb_ot_tags_from_script_and_language/LATIN en_US          16.5 ns         16.4 ns     42568107
BM_hb_ot_tags_from_script_and_language/COMMON none          4.30 ns         4.29 ns    164055469
BM_hb_ot_tags_from_script_and_language/LATIN none           4.29 ns         4.27 ns    163793591

Part of #3591 Humm. Looks like not all of the fat is bsearch overhead now. I cached the last bsearch result, but most of the time is still there. I'm baffled. Before: ------------------------------------------------------------------------------------------------ Benchmark Time CPU Iterations ------------------------------------------------------------------------------------------------ BM_hb_ot_tags_from_script_and_language/COMMON abcd_XY 8.08 ns 8.05 ns 84500482 BM_hb_ot_tags_from_script_and_language/COMMON zh_CN 42.2 ns 42.1 ns 16722006 BM_hb_ot_tags_from_script_and_language/COMMON en_US 16.1 ns 16.0 ns 43461527 BM_hb_ot_tags_from_script_and_language/LATIN en_US 16.5 ns 16.5 ns 42448505 BM_hb_ot_tags_from_script_and_language/COMMON none 4.34 ns 4.33 ns 161290530 BM_hb_ot_tags_from_script_and_language/LATIN none 4.34 ns 4.33 ns 162339799 After: ------------------------------------------------------------------------------------------------ Benchmark Time CPU Iterations ------------------------------------------------------------------------------------------------ BM_hb_ot_tags_from_script_and_language/COMMON abcd_XY 8.13 ns 8.11 ns 80438134 BM_hb_ot_tags_from_script_and_language/COMMON zh_CN 40.0 ns 39.9 ns 17487939 BM_hb_ot_tags_from_script_and_language/COMMON en_US 12.7 ns 12.7 ns 55124394 BM_hb_ot_tags_from_script_and_language/LATIN en_US 13.1 ns 13.0 ns 53660125 BM_hb_ot_tags_from_script_and_language/COMMON none 4.61 ns 4.60 ns 151394104 BM_hb_ot_tags_from_script_and_language/LATIN none 4.70 ns 4.68 ns 150402847

behdad · 2022-05-17T22:22:45Z

Humm. Looks like not all of the fat is bsearch overhead now. I cached the last bsearch result, but most of the time is still there. I'm baffled.

After:

------------------------------------------------------------------------------------------------
Benchmark                                                      Time             CPU   Iterations
------------------------------------------------------------------------------------------------
BM_hb_ot_tags_from_script_and_language/COMMON abcd_XY       8.13 ns         8.11 ns     80438134
BM_hb_ot_tags_from_script_and_language/COMMON zh_CN         40.0 ns         39.9 ns     17487939
BM_hb_ot_tags_from_script_and_language/COMMON en_US         12.7 ns         12.7 ns     55124394
BM_hb_ot_tags_from_script_and_language/LATIN en_US          13.1 ns         13.0 ns     53660125
BM_hb_ot_tags_from_script_and_language/COMMON none          4.61 ns         4.60 ns    151394104
BM_hb_ot_tags_from_script_and_language/LATIN none           4.70 ns         4.68 ns    150402847

behdad · 2022-05-17T22:37:31Z

My benchmark had a bug. Now it looks like not much time is spent in bsearch anymore...

behdad · 2022-05-17T22:38:29Z

These are the current numbers:

------------------------------------------------------------------------------------------------
Benchmark                                                      Time             CPU   Iterations
------------------------------------------------------------------------------------------------
BM_hb_ot_tags_from_script_and_language/COMMON abcd_XY       78.0 ns         77.7 ns      8917912
BM_hb_ot_tags_from_script_and_language/COMMON zh_CN         44.9 ns         44.8 ns     15475318
BM_hb_ot_tags_from_script_and_language/COMMON en_US         17.6 ns         17.5 ns     39812340
BM_hb_ot_tags_from_script_and_language/LATIN en_US          18.2 ns         18.1 ns     38356204
BM_hb_ot_tags_from_script_and_language/COMMON none          4.76 ns         4.74 ns    148746131
BM_hb_ot_tags_from_script_and_language/LATIN none           4.73 ns         4.71 ns    148421349

Part of #3591 Ouch! These are the current numbers: ------------------------------------------------------------------------------------------------ Benchmark Time CPU Iterations ------------------------------------------------------------------------------------------------ BM_hb_ot_tags_from_script_and_language/COMMON abcd_XY 78.0 ns 77.7 ns 8917912 BM_hb_ot_tags_from_script_and_language/COMMON zh_CN 44.9 ns 44.8 ns 15475318 BM_hb_ot_tags_from_script_and_language/COMMON en_US 17.6 ns 17.5 ns 39812340 BM_hb_ot_tags_from_script_and_language/LATIN en_US 18.2 ns 18.1 ns 38356204 BM_hb_ot_tags_from_script_and_language/COMMON none 4.76 ns 4.74 ns 148746131 BM_hb_ot_tags_from_script_and_language/LATIN none 4.73 ns 4.71 ns 148421349

behdad · 2022-05-17T22:39:42Z

Bulk of the abcd_XY and zh_CN time are back in hb_ot_tags_from_complex_language() again. If I disable that, all non-none times come down to 15ns.

behdad · 2022-05-17T22:41:13Z

Next step would be to form a if trie in the generated code for the complex cases instead of the switch-if block that is there right now...

behdad · 2022-05-17T22:42:42Z

Again, I'm happy to call this fixed at this point. :)

Part of #3591

Part of #3591 Comparing before to after Benchmark Time CPU Time Old Time New CPU Old CPU New ---------------------------------------------------------------------------------------------------------------------------------------------------- BM_hb_ot_tags_from_script_and_language/COMMON abcd_XY -0.3371 -0.3371 71 47 71 47

Part of #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

Part of #3591

behdad · 2022-05-18T17:18:14Z

Current numbers:

--------------------------------------------------------------------------------------------------
Benchmark                                                        Time             CPU   Iterations
--------------------------------------------------------------------------------------------------
BM_hb_ot_tags_from_script_and_language/COMMON zh_abcd          133 ns          133 ns      4845544
BM_hb_ot_tags_from_script_and_language/COMMON zh_hans          108 ns          107 ns      6490844
BM_hb_ot_tags_from_script_and_language/COMMON ab_abcd          109 ns          109 ns      6447121
BM_hb_ot_tags_from_script_and_language/COMMON ab_abc          23.5 ns         23.5 ns     29466504
BM_hb_ot_tags_from_script_and_language/COMMON abcdef_XY       20.2 ns         20.1 ns     35021717
BM_hb_ot_tags_from_script_and_language/COMMON abcd_XY         19.6 ns         19.6 ns     35789281
BM_hb_ot_tags_from_script_and_language/COMMON cxy_CN          32.8 ns         32.7 ns     21369410
BM_hb_ot_tags_from_script_and_language/COMMON exy_CN          25.2 ns         25.1 ns     27450162
BM_hb_ot_tags_from_script_and_language/COMMON zh_CN           33.1 ns         33.0 ns     20987357
BM_hb_ot_tags_from_script_and_language/COMMON en_US           15.1 ns         15.0 ns     46329117
BM_hb_ot_tags_from_script_and_language/LATIN en_US            15.5 ns         15.5 ns     45204539
BM_hb_ot_tags_from_script_and_language/COMMON none            4.82 ns         4.81 ns    145076116
BM_hb_ot_tags_from_script_and_language/LATIN none             4.82 ns         4.81 ns    146123477

Adding a second-level switch will be the next step.

behdad · 2022-05-18T17:19:15Z

Although, the ones above 100ns are those going into the non-switch if case.

behdad assigned dscorbett May 17, 2022

behdad closed this as completed May 17, 2022

dscorbett mentioned this issue May 17, 2022

[ot-tags] Avoid strcmp in hb_ot_tags_from_language #3592

Closed

behdad added a commit that referenced this issue May 17, 2022

[ot-tag] Optimize subtag_matches

27c1140

Part of #3591

behdad added a commit that referenced this issue May 18, 2022

[ot-tags] Follow-up to previous commit

e24797a

Part of #3591

behdad reopened this May 18, 2022

behdad closed this as completed May 18, 2022

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[perf] hb_ot_tags_from_language() too slow #3591

[perf] hb_ot_tags_from_language() too slow #3591

behdad commented May 17, 2022

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[perf] hb_ot_tags_from_language() too slow #3591

[perf] hb_ot_tags_from_language() too slow #3591

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