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core/region: optimize the logic of randomly selecting regions within a single range #8211

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merged 4 commits into from
May 23, 2024
Merged

core/region: optimize the logic of randomly selecting regions within a single range #8211

merged 4 commits into from
May 23, 2024

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@JmPotato JmPotato commented May 23, 2024 •
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What problem does this PR solve?

Issue Number: ref #7897.

What is changed and how does it work?

In the case of only one key range, follow the fast path logic to avoid unnecessary random and loop operations.

Check List

Tests

  • Unit test
  • Integration test
  • Manual test (add detailed scripts or steps below)
> benchstat master-6b8d22779.txt new-7c6603926.txt
goos: darwin
goarch: arm64
pkg: github.com/tikv/pd/pkg/core
                                                              │ master-6b8d22779.txt │           new-7c6603926.txt           │
                                                              │        sec/op        │     sec/op      vs base               │
RandomRegion/random_region_whole_range_with_size_10-8                   283.2n ±  2%    244.4n ±   4%  -13.73% (p=0.002 n=6)
RandomRegion/random_regions_whole_range_with_size_10-8                  460.8n ±  5%    404.5n ±   0%  -12.22% (p=0.002 n=6)
RandomRegion/random_region_single_range_with_size_10-8                  364.5n ±  2%    329.6n ±   2%   -9.55% (p=0.002 n=6)
RandomRegion/random_regions_single_range_with_size_10-8                1532.0n ±  1%    560.4n ±   4%  -63.42% (p=0.002 n=6)
RandomRegion/random_region_whole_range_with_size_100-8                  319.5n ±  5%    238.8n ±   4%  -25.27% (p=0.002 n=6)
RandomRegion/random_regions_whole_range_with_size_100-8                 490.0n ±  0%    407.5n ±   2%  -16.83% (p=0.002 n=6)
RandomRegion/random_region_single_range_with_size_100-8                 447.2n ±  1%    404.6n ±   1%   -9.54% (p=0.002 n=6)
RandomRegion/random_regions_single_range_with_size_100-8               2241.5n ±  2%    578.3n ±   0%  -74.20% (p=0.002 n=6)
RandomRegion/random_region_whole_range_with_size_1000-8                 385.2n ±  1%    274.5n ±   3%  -28.72% (p=0.002 n=6)
RandomRegion/random_regions_whole_range_with_size_1000-8                732.0n ±  0%    592.4n ±   1%  -19.08% (p=0.002 n=6)
RandomRegion/random_region_single_range_with_size_1000-8                564.7n ±  2%    516.6n ±   0%   -8.53% (p=0.002 n=6)
RandomRegion/random_regions_single_range_with_size_1000-8              3371.0n ±  0%    892.4n ±   1%  -73.53% (p=0.002 n=6)
RandomRegion/random_region_whole_range_with_size_10000-8                514.0n ±  5%    364.0n ±   5%  -29.19% (p=0.002 n=6)
RandomRegion/random_regions_whole_range_with_size_10000-8               1.250µ ±  3%    1.005µ ±   0%  -19.60% (p=0.002 n=6)
RandomRegion/random_region_single_range_with_size_10000-8               750.0n ±  0%    692.2n ±   1%   -7.71% (p=0.002 n=6)
RandomRegion/random_regions_single_range_with_size_10000-8              4.884µ ±  1%    1.495µ ±   0%  -69.39% (p=0.002 n=6)
RandomRegion/random_region_whole_range_with_size_100000-8               801.8n ±  0%    609.5n ±   2%  -23.99% (p=0.002 n=6)
RandomRegion/random_regions_whole_range_with_size_100000-8              3.711µ ±  1%    3.185µ ±   5%  -14.18% (p=0.002 n=6)
RandomRegion/random_region_single_range_with_size_100000-8              1.130µ ±  5%    1.067µ ±   2%   -5.58% (p=0.030 n=6)
RandomRegion/random_regions_single_range_with_size_100000-8             7.902µ ±  6%    3.614µ ±   5%  -54.26% (p=0.002 n=6)
RandomRegion/random_region_whole_range_with_size_1000000-8             1032.5n ±  4%    821.7n ±   3%  -20.42% (p=0.002 n=6)
RandomRegion/random_regions_whole_range_with_size_1000000-8             6.144µ ±  3%    5.815µ ±   2%   -5.36% (p=0.002 n=6)
RandomRegion/random_region_single_range_with_size_1000000-8             1.518µ ±  1%    1.433µ ±   2%   -5.57% (p=0.002 n=6)
RandomRegion/random_regions_single_range_with_size_1000000-8           12.495µ ±  3%    7.188µ ±   2%  -42.47% (p=0.002 n=6)
RandomRegion/random_region_whole_range_with_size_10000000-8             9.834µ ± 31%   11.163µ ±   7%        ~ (p=0.093 n=6)
RandomRegion/random_regions_whole_range_with_size_10000000-8            92.83µ ± 13%   102.33µ ±   6%  +10.23% (p=0.004 n=6)
RandomRegion/random_region_single_range_with_size_10000000-8            7.853µ ± 22%   10.106µ ± 114%        ~ (p=0.132 n=6)
RandomRegion/random_regions_single_range_with_size_10000000-8           65.62µ ±  7%    48.39µ ±  46%        ~ (p=0.065 n=6)
geomean                                                                 1.828µ          1.321µ         -27.75%

                                                              │ master-6b8d22779.txt │          new-7c6603926.txt          │
                                                              │         B/op         │    B/op     vs base                 │
RandomRegion/random_region_whole_range_with_size_10-8                     416.0 ± 0%   416.0 ± 0%        ~ (p=1.000 n=6) ¹
RandomRegion/random_regions_whole_range_with_size_10-8                    488.0 ± 0%   488.0 ± 0%        ~ (p=1.000 n=6) ¹
RandomRegion/random_region_single_range_with_size_10-8                    424.0 ± 0%   416.0 ± 0%   -1.89% (p=0.002 n=6)
RandomRegion/random_regions_single_range_with_size_10-8                   568.0 ± 0%   488.0 ± 0%  -14.08% (p=0.002 n=6)
RandomRegion/random_region_whole_range_with_size_100-8                    416.0 ± 0%   416.0 ± 0%        ~ (p=1.000 n=6) ¹
RandomRegion/random_regions_whole_range_with_size_100-8                   488.0 ± 0%   488.0 ± 0%        ~ (p=1.000 n=6) ¹
RandomRegion/random_region_single_range_with_size_100-8                   424.0 ± 0%   416.0 ± 0%   -1.89% (p=0.002 n=6)
RandomRegion/random_regions_single_range_with_size_100-8                  568.0 ± 0%   488.0 ± 0%  -14.08% (p=0.002 n=6)
RandomRegion/random_region_whole_range_with_size_1000-8                   416.0 ± 0%   416.0 ± 0%        ~ (p=1.000 n=6) ¹
RandomRegion/random_regions_whole_range_with_size_1000-8                  488.0 ± 0%   488.0 ± 0%        ~ (p=1.000 n=6) ¹
RandomRegion/random_region_single_range_with_size_1000-8                  424.0 ± 0%   416.0 ± 0%   -1.89% (p=0.002 n=6)
RandomRegion/random_regions_single_range_with_size_1000-8                 568.0 ± 0%   488.0 ± 0%  -14.08% (p=0.002 n=6)
RandomRegion/random_region_whole_range_with_size_10000-8                  416.0 ± 0%   416.0 ± 0%        ~ (p=1.000 n=6) ¹
RandomRegion/random_regions_whole_range_with_size_10000-8                 488.0 ± 0%   488.0 ± 0%        ~ (p=1.000 n=6) ¹
RandomRegion/random_region_single_range_with_size_10000-8                 424.0 ± 0%   416.0 ± 0%   -1.89% (p=0.002 n=6)
RandomRegion/random_regions_single_range_with_size_10000-8                568.0 ± 0%   488.0 ± 0%  -14.08% (p=0.002 n=6)
RandomRegion/random_region_whole_range_with_size_100000-8                 416.0 ± 0%   416.0 ± 0%        ~ (p=1.000 n=6) ¹
RandomRegion/random_regions_whole_range_with_size_100000-8                488.0 ± 0%   488.0 ± 0%        ~ (p=1.000 n=6) ¹
RandomRegion/random_region_single_range_with_size_100000-8                424.0 ± 0%   416.0 ± 0%   -1.89% (p=0.002 n=6)
RandomRegion/random_regions_single_range_with_size_100000-8               568.0 ± 0%   488.0 ± 0%  -14.08% (p=0.002 n=6)
RandomRegion/random_region_whole_range_with_size_1000000-8                416.0 ± 0%   416.0 ± 0%        ~ (p=1.000 n=6) ¹
RandomRegion/random_regions_whole_range_with_size_1000000-8               488.0 ± 0%   488.0 ± 0%        ~ (p=1.000 n=6) ¹
RandomRegion/random_region_single_range_with_size_1000000-8               424.0 ± 0%   416.0 ± 0%   -1.89% (p=0.002 n=6)
RandomRegion/random_regions_single_range_with_size_1000000-8              568.0 ± 0%   488.0 ± 0%  -14.08% (p=0.002 n=6)
RandomRegion/random_region_whole_range_with_size_10000000-8               416.0 ± 0%   416.0 ± 0%        ~ (p=1.000 n=6) ¹
RandomRegion/random_regions_whole_range_with_size_10000000-8              488.0 ± 0%   488.0 ± 0%        ~ (p=1.000 n=6) ¹
RandomRegion/random_region_single_range_with_size_10000000-8              424.0 ± 0%   416.0 ± 0%   -1.89% (p=0.002 n=6)
RandomRegion/random_regions_single_range_with_size_10000000-8             568.0 ± 0%   488.0 ± 0%  -14.08% (p=0.002 n=6)
geomean                                                                   470.2        450.6        -4.18%
¹ all samples are equal

                                                              │ master-6b8d22779.txt │          new-7c6603926.txt          │
                                                              │      allocs/op       │ allocs/op   vs base                 │
RandomRegion/random_region_whole_range_with_size_10-8                     4.000 ± 0%   4.000 ± 0%        ~ (p=1.000 n=6) ¹
RandomRegion/random_regions_whole_range_with_size_10-8                    4.000 ± 0%   4.000 ± 0%        ~ (p=1.000 n=6) ¹
RandomRegion/random_region_single_range_with_size_10-8                    5.000 ± 0%   4.000 ± 0%  -20.00% (p=0.002 n=6)
RandomRegion/random_regions_single_range_with_size_10-8                  14.000 ± 0%   4.000 ± 0%  -71.43% (p=0.002 n=6)
RandomRegion/random_region_whole_range_with_size_100-8                    4.000 ± 0%   4.000 ± 0%        ~ (p=1.000 n=6) ¹
RandomRegion/random_regions_whole_range_with_size_100-8                   4.000 ± 0%   4.000 ± 0%        ~ (p=1.000 n=6) ¹
RandomRegion/random_region_single_range_with_size_100-8                   5.000 ± 0%   4.000 ± 0%  -20.00% (p=0.002 n=6)
RandomRegion/random_regions_single_range_with_size_100-8                 14.000 ± 0%   4.000 ± 0%  -71.43% (p=0.002 n=6)
RandomRegion/random_region_whole_range_with_size_1000-8                   4.000 ± 0%   4.000 ± 0%        ~ (p=1.000 n=6) ¹
RandomRegion/random_regions_whole_range_with_size_1000-8                  4.000 ± 0%   4.000 ± 0%        ~ (p=1.000 n=6) ¹
RandomRegion/random_region_single_range_with_size_1000-8                  5.000 ± 0%   4.000 ± 0%  -20.00% (p=0.002 n=6)
RandomRegion/random_regions_single_range_with_size_1000-8                14.000 ± 0%   4.000 ± 0%  -71.43% (p=0.002 n=6)
RandomRegion/random_region_whole_range_with_size_10000-8                  4.000 ± 0%   4.000 ± 0%        ~ (p=1.000 n=6) ¹
RandomRegion/random_regions_whole_range_with_size_10000-8                 4.000 ± 0%   4.000 ± 0%        ~ (p=1.000 n=6) ¹
RandomRegion/random_region_single_range_with_size_10000-8                 5.000 ± 0%   4.000 ± 0%  -20.00% (p=0.002 n=6)
RandomRegion/random_regions_single_range_with_size_10000-8               14.000 ± 0%   4.000 ± 0%  -71.43% (p=0.002 n=6)
RandomRegion/random_region_whole_range_with_size_100000-8                 4.000 ± 0%   4.000 ± 0%        ~ (p=1.000 n=6) ¹
RandomRegion/random_regions_whole_range_with_size_100000-8                4.000 ± 0%   4.000 ± 0%        ~ (p=1.000 n=6) ¹
RandomRegion/random_region_single_range_with_size_100000-8                5.000 ± 0%   4.000 ± 0%  -20.00% (p=0.002 n=6)
RandomRegion/random_regions_single_range_with_size_100000-8              14.000 ± 0%   4.000 ± 0%  -71.43% (p=0.002 n=6)
RandomRegion/random_region_whole_range_with_size_1000000-8                4.000 ± 0%   4.000 ± 0%        ~ (p=1.000 n=6) ¹
RandomRegion/random_regions_whole_range_with_size_1000000-8               4.000 ± 0%   4.000 ± 0%        ~ (p=1.000 n=6) ¹
RandomRegion/random_region_single_range_with_size_1000000-8               5.000 ± 0%   4.000 ± 0%  -20.00% (p=0.002 n=6)
RandomRegion/random_regions_single_range_with_size_1000000-8             14.000 ± 0%   4.000 ± 0%  -71.43% (p=0.002 n=6)
RandomRegion/random_region_whole_range_with_size_10000000-8               4.000 ± 0%   4.000 ± 0%        ~ (p=1.000 n=6) ¹
RandomRegion/random_regions_whole_range_with_size_10000000-8              4.000 ± 0%   4.000 ± 0%        ~ (p=1.000 n=6) ¹
RandomRegion/random_region_single_range_with_size_10000000-8              5.000 ± 0%   4.000 ± 0%  -20.00% (p=0.002 n=6)
RandomRegion/random_regions_single_range_with_size_10000000-8            14.000 ± 0%   4.000 ± 0%  -71.43% (p=0.002 n=6)
geomean                                                                   5.785        4.000       -30.86%
¹ all samples are equal

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@JmPotato JmPotato requested review from nolouch and HuSharp May 23, 2024 04:52
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@ti-chi-bot ti-chi-bot bot added release-note-none Denotes a PR that doesn't merit a release note. size/M Denotes a PR that changes 30-99 lines, ignoring generated files. labels May 23, 2024
@JmPotato JmPotato force-pushed the refine_randome_regions branch 2 times, most recently from f40396d to f3c16af Compare May 23, 2024 05:01
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@JmPotato JmPotato requested a review from HuSharp May 23, 2024 05:09
@JmPotato
Fix the infinite loop
886cd0c 
Signed-off-by: JmPotato <[email protected]>
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Codecov Report

Attention: Patch coverage is 82.14286% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 77.29%. Comparing base (6b8d227) to head (7c66039).

Additional details and impacted files 
@@            Coverage Diff             @@
##           master    #8211      +/-   ##
==========================================
- Coverage   77.29%   77.29%   -0.01%     
==========================================
  Files         471      471              
  Lines       61436    61445       +9     
==========================================
+ Hits        47486    47492       +6     
+ Misses      10392    10387       -5     
- Partials     3558     3566       +8
Flag Coverage Δ
unittests 77.29% <82.14%> (-0.01%) ⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

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@ti-chi-bot ti-chi-bot bot added status/LGT2 Indicates that a PR has LGTM 2. and removed status/LGT1 Indicates that a PR has LGTM 1. labels May 23, 2024
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/merge

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This pull request has been accepted and is ready to merge.

Commit hash: 7c66039

@ti-chi-bot ti-chi-bot bot added the status/can-merge Indicates a PR has been approved by a committer. label May 23, 2024
@ti-chi-bot ti-chi-bot bot merged commit 4cd42b3 into tikv:master May 23, 2024
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@JmPotato JmPotato deleted the refine_randome_regions branch May 23, 2024 09:42
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