Ruby

master: ruby 4.1.0dev (2026-07-02T09:24:35Z master 7c69f93d53) +PRISM [arm64-darwin25]

current: ruby 4.1.0dev (2026-07-02T11:29:55Z str-subseq-embed-f.. e7c2d5062c) +PRISM [arm64-darwin25]

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bench master (ms) current (ms) current 1st itr master/current

activerecord 148.7 ± 0.7% 153.0 ± 3.0% 1.009 0.972

chunky-png 503.5 ± 0.3% 509.7 ± 0.3% 0.991 0.988

erubi-rails 668.3 ± 0.8% 671.4 ± 1.1% 0.988 0.995

hexapdf 1250.6 ± 0.2% 1246.7 ± 0.4% 0.999 1.003

liquid-c 31.2 ± 6.3% 30.6 ± 3.7% 1.009 1.022

liquid-compile 28.8 ± 4.5% 28.6 ± 5.5% 1.000 1.007

liquid-render 80.3 ± 2.1% 79.8 ± 2.1% 1.011 1.006

lobsters 475.1 ± 0.6% 476.1 ± 0.7% 0.943 0.998

mail 69.1 ± 1.6% 69.1 ± 1.4% 0.997 1.000

psych-load 1244.9 ± 0.2% 1291.4 ± 0.6% 0.986 0.964

railsbench 906.5 ± 1.3% 898.8 ± 0.7% 0.996 1.009

rubocop 101.2 ± 6.0% 101.1 ± 5.6% 1.000 1.001

ruby-lsp 96.8 ± 0.6% 96.3 ± 1.7% 1.041 1.006

sequel 30.6 ± 3.6% 30.4 ± 3.7% 1.001 1.008

shipit 829.7 ± 0.9% 828.6 ± 1.9% 1.010 1.001

addressable-equality 356.3 ± 0.3% 360.8 ± 0.7% 1.002 0.988

addressable-getters 88.0 ± 0.5% 88.9 ± 1.5% 0.996 0.990

addressable-join 166.0 ± 1.0% 165.0 ± 1.3% 1.011 1.006

addressable-merge 91.1 ± 0.8% 91.1 ± 0.7% 0.998 1.000

addressable-new 42.3 ± 0.7% 42.3 ± 0.7% 0.961 0.999

addressable-normalize 200.1 ± 0.4% 199.9 ± 0.4% 0.981 1.001

addressable-parse 135.8 ± 0.5% 136.8 ± 0.7% 0.992 0.993

addressable-setters 78.5 ± 0.7% 77.7 ± 0.6% 0.989 1.010

addressable-to-s 88.1 ± 0.6% 88.7 ± 0.6% 1.028 0.993

binarytrees 225.7 ± 0.5% 226.6 ± 0.4% 0.995 0.996

blurhash 251.3 ± 0.3% 250.7 ± 0.2% 1.002 1.002

erubi 122.8 ± 0.5% 123.8 ± 0.4% 0.991 0.991

etanni 211.4 ± 0.6% 211.0 ± 0.5% 1.000 1.002

fannkuchredux 357.4 ± 0.3% 357.6 ± 0.3% 0.998 1.000

fluentd 258.6 ± 0.4% 230.8 ± 4.3% 1.044 1.120

gcbench 1295.6 ± 0.3% 1294.7 ± 0.4% 1.004 1.001

graphql 39.6 ± 1.0% 39.9 ± 0.8% 1.004 0.993

graphql-native 172.0 ± 0.4% 174.9 ± 0.5% 1.034 0.983

knucleotide 28.3 ± 6.6% 28.1 ± 7.1% 1.020 1.005

lee 527.0 ± 0.3% 528.6 ± 0.2% 0.995 0.997

matmul 358.4 ± 0.3% 357.9 ± 0.2% 1.009 1.001

nbody 64.1 ± 0.5% 64.2 ± 0.8% 1.000 0.999

nqueens 162.8 ± 0.3% 163.3 ± 0.4% 0.998 0.997

optcarrot 3440.1 ± 0.7% 3432.0 ± 0.7% 1.002 1.002

protoboeuf 103.1 ± 0.5% 103.0 ± 0.5% 1.003 1.001

protoboeuf-encode 99.5 ± 1.0% 99.9 ± 1.0% 0.999 0.997

rack 32.2 ± 4.4% 31.9 ± 3.4% 0.996 1.009

ruby-json 154.1 ± 0.4% 150.2 ± 0.4% 1.033 1.026

rubyboy 3123.6 ± 0.1% 3128.1 ± 0.1% 0.998 0.999

rubykon 574.9 ± 1.3% 574.8 ± 1.4% 0.997 1.000

splay 91.0 ± 64.1% 90.4 ± 60.5% 1.007 1.006

sudoku 398.8 ± 0.3% 398.6 ± 0.2% 1.007 1.000

tinygql 385.9 ± 0.5% 380.1 ± 0.3% 1.020 1.015

30k_ifelse 330.2 ± 0.9% 332.4 ± 0.6% 1.006 0.993

30k_methods 281.0 ± 0.6% 280.3 ± 0.8% 0.994 1.003

attr_accessor 127.9 ± 0.7% 127.9 ± 0.5% 1.002 1.000

cfunc_itself 60.8 ± 0.5% 60.6 ± 0.7% 1.005 1.002

fib 162.3 ± 0.4% 162.7 ± 0.5% 0.991 0.998

getivar 90.8 ± 0.5% 90.7 ± 0.8% 1.000 1.001

getivar-module 180.7 ± 0.5% 180.7 ± 0.5% 1.003 1.000

keyword_args 138.0 ± 0.5% 138.0 ± 0.5% 1.000 1.000

loops-times 714.2 ± 0.2% 714.5 ± 0.2% 0.998 1.000

object-new 36.3 ± 0.9% 36.2 ± 1.0% 1.001 1.003

object-new-initialize 71.0 ± 0.7% 71.3 ± 0.6% 0.997 0.996

object-new-no-escape 141.3 ± 0.9% 141.0 ± 0.4% 1.003 1.003

respond_to 149.7 ± 0.5% 150.0 ± 0.5% 0.998 0.997

ruby-xor 85.1 ± 0.5% 84.9 ± 0.6% 1.000 1.002

send_bmethod 146.1 ± 0.4% 146.9 ± 1.3% 0.998 0.995

send_cfunc_block 191.2 ± 0.4% 190.9 ± 0.3% 0.999 1.001

send_rubyfunc_block 98.3 ± 0.5% 97.0 ± 0.5% 1.016 1.014

setivar 60.7 ± 0.8% 60.6 ± 1.0% 1.006 1.003

setivar_object 70.7 ± 2.5% 70.4 ± 2.2% 1.003 1.003

setivar_young 70.7 ± 2.3% 70.9 ± 2.3% 1.068 0.997

str_concat 55.4 ± 1.0% 55.2 ± 1.0% 1.004 1.003

structaref 130.6 ± 0.6% 130.4 ± 0.6% 0.995 1.002

structaset 119.2 ± 0.7% 118.9 ± 0.7% 1.002 1.003

throw 14.3 ± 1.4% 14.3 ± 1.4% 1.007 1.003

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GC summary:

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bench mark/iter ratio sweep/iter ratio mark/GC ratio sweep/GC ratio major/iter minor/iter minor GC %

gcbench 0.659 0.996 0.635 0.959 0.0 → 0.0 54.0 → 52.0 100% → 100%

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Legend:

- current 1st itr: ratio of master/current time for the first benchmarking iteration.

- master/current: ratio of master/current time. Higher is better for current. Above 1 represents a speedup.

- GC summary compares master → comparison. Ratio columns are master/comparison; above 1 means the comparison spent less GC time.

- mark/iter ratio and sweep/iter ratio compare total GC phase time per benchmark iteration, so they include both per-GC cost and GC frequency changes.

- mark/GC ratio and sweep/GC ratio compare average phase time per GC, isolating whether each GC became cheaper or more expensive.

- major/iter, minor/iter, and minor GC % show master → comparison values, not ratios. Rows with no GC activity are omitted.