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Show Major/minor stats on per-iteration gc benchmarks#489

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eightbitraptor merged 3 commits intomainfrom
mvh-add-gc-stats
Mar 17, 2026
Merged

Show Major/minor stats on per-iteration gc benchmarks#489
eightbitraptor merged 3 commits intomainfrom
mvh-add-gc-stats

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@eightbitraptor eightbitraptor commented Mar 12, 2026 •
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This adds some extra info to each benchmark run:

itr:   time   marking  sweeping  gc_count     major     minor  maj/min
#20: 3098ms      77.0ms     106.0ms        64         0        64      0.00
#21: 3053ms      41.0ms     102.0ms        66         1        65      0.02
#22: 3092ms      76.0ms     103.0ms        64         0        64      0.00
#23: 3049ms      38.0ms     102.0ms        66         1        65      0.02
#24: 3093ms      72.0ms     106.0ms        64         0        64      0.00
#25: 3058ms      47.0ms     103.0ms        73         0        73      0.00
RSS: 50.1MiB
MAXRSS: 61.7MiB
Average of last 10, non-warmup iters: 3072ms
Average marking time: 58.0ms
Average sweeping time: 104.0ms

It also adds a small heap utilisation table once each benchmark has finished all it's runs

Heap utilisation (after full GC):
heap  slot_size  eden_slots  live_slots  free_slots  eden_pages  live_pct  mem_KiB
   0         40       19649       13490        6159           12     68.7%    768.0
   1         80      163638      135329       28309          200     82.7%  12800.0
   2        160        3272        1530        1742            8     46.8%    512.0
   3        320         611          12         599            3      2.0%    192.0
   4        640         305          49         256            3     16.1%    192.0

and adds some gc information to the summary table:

-------  -------------  ----------------  -----------------  ---------------  --------------------  ---------------------  ------------------  -----------------  ----------------------  -----------------------
bench      master (ms)  master mark (ms)  master sweep (ms)  experiment (ms)  experiment mark (ms)  experiment sweep (ms)  experiment 1st itr  master/experiment  mark master/experiment  sweep master/experiment
gcbench  3072.8 ± 0.9%      58.3 ± 43.7%       104.9 ± 4.2%    3024.5 ± 0.4%          54.9 ± 23.0%           102.5 ± 2.8%               1.013        1.016 (***)             1.062                    1.023
-------  -------------  ----------------  -----------------  ---------------  --------------------  ---------------------  ------------------  -----------------  ----------------------  -----------------------

This info is only added for benchmarks using the GC harness via --harness=gc' or --category=gc`

@eightbitraptor eightbitraptor merged commit 54c9ebf into main Mar 17, 2026
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@eightbitraptor eightbitraptor deleted the mvh-add-gc-stats branch March 17, 2026 17:16
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