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 2,779
bash 118,863 714
osh-native-souffle 118,863 457
osh-native 118,863 419
osh-cpython 118,863 12

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 4 4 0 3 2,698 Build.sh
osh-native-souffle 8 7 1 8 2,698 Build.sh
osh-native 8 4 5 8 2,698 Build.sh
osh-cpython 281 259 22 21 2,698 Build.sh
dash 2 1 1 1 2,512 abuild
bash 5 4 1 3 2,512 abuild
osh-native-souffle 9 6 3 8 2,512 abuild
osh-native 9 7 2 8 2,512 abuild
osh-cpython 372 345 27 22 2,512 abuild
dash 8 6 2 2 20,489 configure
bash 31 30 1 4 20,489 configure
osh-native-souffle 41 35 6 20 20,489 configure
osh-native 44 36 8 21 20,489 configure
osh-cpython 1,805 1,768 37 43 20,489 configure
dash 21 20 1 1 69,779 configure-coreutils
bash 77 76 1 3 69,779 configure-coreutils
osh-native-souffle 147 123 24 51 69,779 configure-coreutils
osh-native 161 135 26 50 69,779 configure-coreutils
osh-cpython 5,365 5,286 78 87 69,779 configure-coreutils
bash 5 4 1 3 2,029 configure-helper.sh
osh-native-souffle 6 4 2 8 2,029 configure-helper.sh
osh-native 7 3 4 8 2,029 configure-helper.sh
osh-cpython 268 242 26 21 2,029 configure-helper.sh
dash 1 1 0 1 1,733 functions
bash 4 2 2 3 1,733 functions
osh-native-souffle 6 4 2 8 1,733 functions
osh-native 6 3 3 8 1,733 functions
osh-cpython 258 230 28 21 1,733 functions
dash 4 3 1 2 9,661 ltmain.sh
bash 17 14 3 4 9,661 ltmain.sh
osh-native-souffle 19 14 5 14 9,661 ltmain.sh
osh-native 21 17 4 15 9,661 ltmain.sh
osh-cpython 856 829 27 29 9,661 ltmain.sh
dash 1 0 1 1 1,679 t4014-format-patch.sh
bash 3 3 0 3 1,679 t4014-format-patch.sh
osh-native-souffle 4 3 1 7 1,679 t4014-format-patch.sh
osh-native 4 0 4 7 1,679 t4014-format-patch.sh
osh-cpython 100 78 22 19 1,679 t4014-format-patch.sh
dash 1 1 0 1 3,123 t9300-fast-import.sh
osh-native-souffle 4 0 4 7 3,123 t9300-fast-import.sh
osh-native 4 2 3 7 3,123 t9300-fast-import.sh
bash 5 5 0 3 3,123 t9300-fast-import.sh
osh-cpython 109 87 22 19 3,123 t9300-fast-import.sh
bash 15 14 1 3 5,160 test-cmd-util.sh
osh-native-souffle 16 13 4 12 5,160 test-cmd-util.sh
osh-native 18 16 2 12 5,160 test-cmd-util.sh
osh-cpython 786 766 20 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 32,960,592 2,698 Build.sh
bash 35,958,882 2,698 Build.sh
osh-native 37,592,943 2,698 Build.sh
dash 7,042,147 2,512 abuild
bash 43,761,475 2,512 abuild
osh-native-souffle 44,368,850 2,512 abuild
osh-native 45,313,305 2,512 abuild
dash 53,261,640 20,489 configure
osh-native-souffle 241,560,836 20,489 configure
osh-native 276,258,041 20,489 configure
bash 349,702,388 20,489 configure
dash 151,770,612 69,779 configure-coreutils
osh-native-souffle 782,334,805 69,779 configure-coreutils
osh-native 880,753,895 69,779 configure-coreutils
bash 886,197,417 69,779 configure-coreutils
osh-native-souffle 26,530,773 2,029 configure-helper.sh
osh-native 30,633,772 2,029 configure-helper.sh
bash 47,119,375 2,029 configure-helper.sh
dash 4,652,224 1,733 functions
osh-native-souffle 24,857,863 1,733 functions
bash 28,169,399 1,733 functions
osh-native 28,969,858 1,733 functions
dash 23,597,230 9,661 ltmain.sh
osh-native-souffle 97,402,207 9,661 ltmain.sh
osh-native 113,400,457 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 10,808,681 1,679 t4014-format-patch.sh
osh-native 11,858,162 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 12,672,636 3,123 t9300-fast-import.sh
osh-native 13,920,106 3,123 t9300-fast-import.sh
bash 41,138,083 3,123 t9300-fast-import.sh
osh-native-souffle 97,439,636 5,160 test-cmd-util.sh
osh-native 112,714,785 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-3f0ab3b3
dash dash-0ebcf347
osh-cpython osh-c41ee4a6
osh-native osh-46aa57f3
osh-native-souffle osh-native-souffle-65f81adc
host label host id
no-host no-host-e4839999

Raw Data

filename
no-host.2025-03-02__06-07-51.cachegrind.tsv
no-host.2025-03-02__06-07-51.times.csv