OSH Parser Performance

We time $sh -n $file for various files under various shells, and repeat then run under cachegrind for stable metrics.

Source code: oil/benchmarks/osh-parser.sh

Raw files

Summary

Instructions Per Line (via cachegrind)

Lower numbers are generally better, but each shell recognizes a different language, and OSH uses a more thorough parsing algorithm. In thousands of "I refs".

shell label total lines thousand irefs per line
bash 118,863 15.1
dash 111,674 2.3
osh-native 118,863 13.1
osh-native-souffle 118,863 11.5

(zsh isn't measured because zsh -n unexpectedly forks.)

Average Parsing Rate, Measured on Two Machines (lines/ms)

Shell startup time is included in the elapsed time measurements, but long files are chosen to minimize its effect.

shell label total lines host no-host
dash 111,674 2,710
bash 118,863 704
osh-native-souffle 118,863 456
osh-native 118,863 440
osh-cpython 118,863 11

Per-File Measurements

Time and Memory

shell label elapsed ms user ms sys ms max rss MB num lines filename
dash 2 1 1 1 2,698 Build.sh
bash 5 5 0 3 2,698 Build.sh
osh-native-souffle 7 6 1 8 2,698 Build.sh
osh-native 8 5 3 8 2,698 Build.sh
osh-cpython 281 261 20 22 2,698 Build.sh
dash 2 2 0 1 2,512 abuild
bash 5 4 1 3 2,512 abuild
osh-native-souffle 8 6 2 8 2,512 abuild
osh-native 9 4 5 9 2,512 abuild
osh-cpython 373 347 26 22 2,512 abuild
dash 9 8 1 2 20,489 configure
bash 32 31 1 4 20,489 configure
osh-native-souffle 41 34 8 20 20,489 configure
osh-native 44 32 12 21 20,489 configure
osh-cpython 1,847 1,809 38 43 20,489 configure
dash 21 21 0 2 69,779 configure-coreutils
bash 78 75 3 3 69,779 configure-coreutils
osh-native-souffle 145 120 25 50 69,779 configure-coreutils
osh-native 146 126 20 50 69,779 configure-coreutils
osh-cpython 5,432 5,341 90 86 69,779 configure-coreutils
bash 5 3 2 3 2,029 configure-helper.sh
osh-native-souffle 6 4 3 8 2,029 configure-helper.sh
osh-native 7 2 5 8 2,029 configure-helper.sh
osh-cpython 279 255 24 21 2,029 configure-helper.sh
dash 1 1 0 1 1,733 functions
bash 4 3 1 3 1,733 functions
osh-native-souffle 6 5 1 8 1,733 functions
osh-native 7 4 2 8 1,733 functions
osh-cpython 271 252 19 21 1,733 functions
dash 5 5 0 2 9,661 ltmain.sh
bash 17 16 1 4 9,661 ltmain.sh
osh-native-souffle 21 14 7 15 9,661 ltmain.sh
osh-native 22 12 10 15 9,661 ltmain.sh
osh-cpython 856 828 29 29 9,661 ltmain.sh
dash 1 0 1 1 1,679 t4014-format-patch.sh
bash 3 2 2 3 1,679 t4014-format-patch.sh
osh-native-souffle 4 1 3 7 1,679 t4014-format-patch.sh
osh-native 4 1 3 7 1,679 t4014-format-patch.sh
osh-cpython 103 84 19 19 1,679 t4014-format-patch.sh
dash 1 0 1 1 3,123 t9300-fast-import.sh
osh-native-souffle 4 3 1 7 3,123 t9300-fast-import.sh
osh-native 5 3 2 8 3,123 t9300-fast-import.sh
bash 5 5 0 3 3,123 t9300-fast-import.sh
osh-cpython 111 93 17 19 3,123 t9300-fast-import.sh
bash 15 14 1 3 5,160 test-cmd-util.sh
osh-native-souffle 17 12 5 12 5,160 test-cmd-util.sh
osh-native 19 16 3 12 5,160 test-cmd-util.sh
osh-cpython 786 753 34 28 5,160 test-cmd-util.sh

Instruction Counts

shell label irefs num lines filename
dash 6,416,010 2,698 Build.sh
osh-native-souffle 32,964,457 2,698 Build.sh
bash 35,958,882 2,698 Build.sh
osh-native 37,602,480 2,698 Build.sh
dash 7,042,147 2,512 abuild
osh-native-souffle 38,801,036 2,512 abuild
bash 43,761,475 2,512 abuild
osh-native 45,324,567 2,512 abuild
dash 53,261,640 20,489 configure
osh-native-souffle 241,641,752 20,489 configure
osh-native 276,284,165 20,489 configure
bash 349,702,388 20,489 configure
dash 151,770,612 69,779 configure-coreutils
osh-native-souffle 782,431,548 69,779 configure-coreutils
osh-native 880,790,067 69,779 configure-coreutils
bash 886,197,417 69,779 configure-coreutils
osh-native-souffle 26,544,301 2,029 configure-helper.sh
osh-native 30,641,544 2,029 configure-helper.sh
bash 47,119,375 2,029 configure-helper.sh
dash 4,652,224 1,733 functions
osh-native-souffle 24,869,506 1,733 functions
bash 28,169,399 1,733 functions
osh-native 28,976,982 1,733 functions
dash 23,597,230 9,661 ltmain.sh
osh-native-souffle 97,428,661 9,661 ltmain.sh
osh-native 113,411,927 9,661 ltmain.sh
bash 172,930,991 9,661 ltmain.sh
dash 3,166,564 1,679 t4014-format-patch.sh
osh-native-souffle 10,814,605 1,679 t4014-format-patch.sh
osh-native 11,864,209 1,679 t4014-format-patch.sh
bash 25,314,918 1,679 t4014-format-patch.sh
dash 4,357,271 3,123 t9300-fast-import.sh
osh-native-souffle 12,678,634 3,123 t9300-fast-import.sh
osh-native 13,925,831 3,123 t9300-fast-import.sh
bash 41,138,083 3,123 t9300-fast-import.sh
osh-native-souffle 97,490,207 5,160 test-cmd-util.sh
osh-native 112,739,144 5,160 test-cmd-util.sh
bash 161,950,200 5,160 test-cmd-util.sh

Shell and Host Details

shell label shell id
bash bash-e47c1e8d
dash dash-0ebcf347
osh-cpython osh-d9c1729f
osh-native osh-f73c08c8
osh-native-souffle osh-native-souffle-d4f3f920
host label host id
no-host no-host-e4839999

Raw Data

filename
no-host.2025-03-28__12-00-32.cachegrind.tsv
no-host.2025-03-28__12-00-32.times.csv