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 2,715
bash 118,863 707
osh-native 118,863 416
osh-native-souffle 118,863 411
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 2 0 1 2,698 Build.sh
bash 5 3 2 3 2,698 Build.sh
osh-native-souffle 8 4 4 8 2,698 Build.sh
osh-native 8 5 3 8 2,698 Build.sh
osh-cpython 290 268 21 22 2,698 Build.sh
dash 2 1 1 1 2,512 abuild
bash 5 4 1 3 2,512 abuild
osh-native-souffle 8 6 3 8 2,512 abuild
osh-native 9 6 3 9 2,512 abuild
osh-cpython 383 357 26 22 2,512 abuild
dash 8 7 1 2 20,489 configure
bash 32 31 1 4 20,489 configure
osh-native-souffle 45 38 7 20 20,489 configure
osh-native 45 41 4 21 20,489 configure
osh-cpython 1,870 1,821 49 43 20,489 configure
dash 21 19 2 2 69,779 configure-coreutils
bash 77 76 1 3 69,779 configure-coreutils
osh-native 160 137 23 50 69,779 configure-coreutils
osh-native-souffle 171 143 28 49 69,779 configure-coreutils
osh-cpython 5,505 5,435 70 87 69,779 configure-coreutils
bash 6 4 2 3 2,029 configure-helper.sh
osh-native-souffle 6 4 2 8 2,029 configure-helper.sh
osh-native 7 6 1 8 2,029 configure-helper.sh
osh-cpython 280 258 21 21 2,029 configure-helper.sh
dash 1 0 1 1 1,733 functions
bash 4 3 1 3 1,733 functions
osh-native-souffle 6 4 2 8 1,733 functions
osh-native 7 5 2 8 1,733 functions
osh-cpython 269 250 20 21 1,733 functions
dash 5 4 1 2 9,661 ltmain.sh
bash 17 15 2 4 9,661 ltmain.sh
osh-native-souffle 20 12 8 15 9,661 ltmain.sh
osh-native 21 18 4 15 9,661 ltmain.sh
osh-cpython 874 846 28 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 1 3 7 1,679 t4014-format-patch.sh
osh-cpython 106 87 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
bash 5 3 1 3 3,123 t9300-fast-import.sh
osh-native 5 3 2 8 3,123 t9300-fast-import.sh
osh-cpython 116 96 20 19 3,123 t9300-fast-import.sh
bash 15 14 1 3 5,160 test-cmd-util.sh
osh-native-souffle 17 13 4 12 5,160 test-cmd-util.sh
osh-native 18 14 4 12 5,160 test-cmd-util.sh
osh-cpython 779 753 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 32,965,614 2,698 Build.sh
bash 35,958,882 2,698 Build.sh
osh-native 37,603,533 2,698 Build.sh
dash 7,042,147 2,512 abuild
osh-native-souffle 38,802,175 2,512 abuild
bash 43,761,475 2,512 abuild
osh-native 45,325,678 2,512 abuild
dash 53,261,640 20,489 configure
osh-native-souffle 241,644,384 20,489 configure
osh-native 276,286,681 20,489 configure
bash 349,702,388 20,489 configure
dash 151,770,612 69,779 configure-coreutils
osh-native-souffle 782,435,526 69,779 configure-coreutils
osh-native 880,793,865 69,779 configure-coreutils
bash 886,197,417 69,779 configure-coreutils
osh-native-souffle 26,544,277 2,029 configure-helper.sh
osh-native 30,642,330 2,029 configure-helper.sh
bash 47,119,375 2,029 configure-helper.sh
dash 4,652,224 1,733 functions
osh-native-souffle 24,870,316 1,733 functions
bash 28,169,399 1,733 functions
osh-native 28,977,776 1,733 functions
dash 23,597,230 9,661 ltmain.sh
osh-native-souffle 97,429,856 9,661 ltmain.sh
osh-native 113,413,576 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 10,815,032 1,679 t4014-format-patch.sh
osh-native 11,864,721 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 12,679,145 3,123 t9300-fast-import.sh
osh-native 13,926,303 3,123 t9300-fast-import.sh
bash 41,138,083 3,123 t9300-fast-import.sh
osh-native-souffle 97,491,720 5,160 test-cmd-util.sh
osh-native 112,742,181 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-ab7b6074
dash dash-0ebcf347
osh-cpython osh-6037e87d
osh-native osh-d38d853a
osh-native-souffle osh-native-souffle-ad8fbd87
host label host id
no-host no-host-e4839999

Raw Data

filename
no-host.2025-03-28__12-03-21.cachegrind.tsv
no-host.2025-03-28__12-03-21.times.csv