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 2,674
bash 118,863 641
osh-native-souffle 118,863 442
osh-native 118,863 396
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 4 1 3 2,698 Build.sh
osh-native-souffle 8 5 3 8 2,698 Build.sh
osh-native 8 6 2 8 2,698 Build.sh
osh-cpython 286 261 25 21 2,698 Build.sh
dash 2 2 0 1 2,512 abuild
bash 6 5 1 3 2,512 abuild
osh-native-souffle 9 4 6 8 2,512 abuild
osh-native 10 5 5 9 2,512 abuild
osh-cpython 383 354 28 22 2,512 abuild
dash 8 7 2 2 20,489 configure
bash 34 33 1 4 20,489 configure
osh-native-souffle 42 34 8 21 20,489 configure
osh-native 48 39 9 21 20,489 configure
osh-cpython 1,852 1,795 57 43 20,489 configure
dash 21 20 2 2 69,779 configure-coreutils
bash 83 82 1 3 69,779 configure-coreutils
osh-native-souffle 151 127 24 51 69,779 configure-coreutils
osh-native 167 146 21 50 69,779 configure-coreutils
osh-cpython 5,499 5,410 88 87 69,779 configure-coreutils
osh-native-souffle 7 5 1 8 2,029 configure-helper.sh
bash 7 5 2 3 2,029 configure-helper.sh
osh-native 9 5 3 8 2,029 configure-helper.sh
osh-cpython 276 252 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 3 3 8 1,733 functions
osh-native 7 3 4 8 1,733 functions
osh-cpython 264 241 22 21 1,733 functions
dash 5 3 1 2 9,661 ltmain.sh
osh-native-souffle 20 14 6 14 9,661 ltmain.sh
bash 23 21 2 4 9,661 ltmain.sh
osh-native 23 19 5 15 9,661 ltmain.sh
osh-cpython 874 843 31 29 9,661 ltmain.sh
dash 1 1 1 1 1,679 t4014-format-patch.sh
bash 4 3 1 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 105 87 18 19 1,679 t4014-format-patch.sh
dash 1 1 0 1 3,123 t9300-fast-import.sh
osh-native-souffle 4 4 1 7 3,123 t9300-fast-import.sh
osh-native 5 2 3 7 3,123 t9300-fast-import.sh
bash 5 4 1 3 3,123 t9300-fast-import.sh
osh-cpython 115 99 17 19 3,123 t9300-fast-import.sh
bash 16 15 1 3 5,160 test-cmd-util.sh
osh-native-souffle 17 10 7 12 5,160 test-cmd-util.sh
osh-native 20 15 4 12 5,160 test-cmd-util.sh
osh-cpython 792 766 26 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 32,960,754 2,698 Build.sh
bash 35,958,882 2,698 Build.sh
osh-native 37,593,001 2,698 Build.sh
dash 7,042,147 2,512 abuild
bash 43,761,475 2,512 abuild
osh-native-souffle 44,369,012 2,512 abuild
osh-native 45,313,363 2,512 abuild
dash 53,261,640 20,489 configure
osh-native-souffle 241,560,998 20,489 configure
osh-native 276,258,129 20,489 configure
bash 349,702,388 20,489 configure
dash 151,770,612 69,779 configure-coreutils
osh-native-souffle 782,334,966 69,779 configure-coreutils
osh-native 880,753,983 69,779 configure-coreutils
bash 886,197,417 69,779 configure-coreutils
osh-native-souffle 26,530,935 2,029 configure-helper.sh
osh-native 30,633,830 2,029 configure-helper.sh
bash 47,119,375 2,029 configure-helper.sh
dash 4,652,224 1,733 functions
osh-native-souffle 24,858,025 1,733 functions
bash 28,169,399 1,733 functions
osh-native 28,969,916 1,733 functions
dash 23,597,230 9,661 ltmain.sh
osh-native-souffle 97,402,507 9,661 ltmain.sh
osh-native 113,400,324 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 10,808,889 1,679 t4014-format-patch.sh
osh-native 11,858,156 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 12,672,798 3,123 t9300-fast-import.sh
osh-native 13,920,164 3,123 t9300-fast-import.sh
bash 41,138,083 3,123 t9300-fast-import.sh
osh-native-souffle 97,439,891 5,160 test-cmd-util.sh
osh-native 112,714,746 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-b7cecaef
dash dash-0ebcf347
osh-cpython osh-466cebda
osh-native osh-658d90cf
osh-native-souffle osh-native-souffle-03b5a597
host label host id
no-host no-host-e4839999

Raw Data

filename
no-host.2025-03-02__05-43-18.cachegrind.tsv
no-host.2025-03-02__05-43-18.times.csv