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 2,729
bash 118,863 694
osh-native-souffle 118,863 421
osh-native 118,863 387
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 3 2 3 2,698 Build.sh
osh-native-souffle 7 6 2 8 2,698 Build.sh
osh-native 8 4 4 8 2,698 Build.sh
osh-cpython 290 266 24 22 2,698 Build.sh
dash 2 2 0 1 2,512 abuild
bash 5 4 2 3 2,512 abuild
osh-native-souffle 9 4 4 8 2,512 abuild
osh-native 9 7 2 9 2,512 abuild
osh-cpython 382 350 31 22 2,512 abuild
dash 8 7 1 2 20,489 configure
bash 32 32 0 4 20,489 configure
osh-native-souffle 45 37 8 20 20,489 configure
osh-native 51 39 12 21 20,489 configure
osh-cpython 1,880 1,834 46 43 20,489 configure
dash 21 19 2 2 69,779 configure-coreutils
bash 79 78 1 3 69,779 configure-coreutils
osh-native-souffle 162 140 22 49 69,779 configure-coreutils
osh-native 176 156 20 50 69,779 configure-coreutils
osh-cpython 5,459 5,387 71 87 69,779 configure-coreutils
bash 5 4 2 3 2,029 configure-helper.sh
osh-native-souffle 6 6 1 8 2,029 configure-helper.sh
osh-native 7 5 2 9 2,029 configure-helper.sh
osh-cpython 280 259 21 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 4 2 8 1,733 functions
osh-native 7 5 3 8 1,733 functions
osh-cpython 266 239 27 21 1,733 functions
dash 5 4 1 2 9,661 ltmain.sh
bash 17 14 3 4 9,661 ltmain.sh
osh-native-souffle 20 12 8 15 9,661 ltmain.sh
osh-native 22 18 4 15 9,661 ltmain.sh
osh-cpython 862 833 29 29 9,661 ltmain.sh
dash 1 0 1 1 1,679 t4014-format-patch.sh
bash 3 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 3 1 7 1,679 t4014-format-patch.sh
osh-cpython 105 88 17 19 1,679 t4014-format-patch.sh
dash 1 0 1 1 3,123 t9300-fast-import.sh
osh-native-souffle 4 2 2 7 3,123 t9300-fast-import.sh
osh-native 4 2 2 7 3,123 t9300-fast-import.sh
bash 5 4 1 3 3,123 t9300-fast-import.sh
osh-cpython 114 91 24 19 3,123 t9300-fast-import.sh
bash 15 14 1 3 5,160 test-cmd-util.sh
osh-native-souffle 18 12 5 12 5,160 test-cmd-util.sh
osh-native 19 13 6 12 5,160 test-cmd-util.sh
osh-cpython 789 763 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 32,961,856 2,698 Build.sh
bash 35,958,882 2,698 Build.sh
osh-native 37,599,764 2,698 Build.sh
dash 7,042,147 2,512 abuild
osh-native-souffle 38,798,371 2,512 abuild
bash 43,761,475 2,512 abuild
osh-native 45,321,096 2,512 abuild
dash 53,261,640 20,489 configure
osh-native-souffle 241,632,003 20,489 configure
osh-native 276,275,155 20,489 configure
bash 349,702,388 20,489 configure
dash 151,770,612 69,779 configure-coreutils
osh-native-souffle 782,423,369 69,779 configure-coreutils
osh-native 880,783,741 69,779 configure-coreutils
bash 886,197,417 69,779 configure-coreutils
osh-native-souffle 26,541,948 2,029 configure-helper.sh
osh-native 30,639,270 2,029 configure-helper.sh
bash 47,119,375 2,029 configure-helper.sh
dash 4,652,224 1,733 functions
osh-native-souffle 24,867,146 1,733 functions
bash 28,169,399 1,733 functions
osh-native 28,974,674 1,733 functions
dash 23,597,230 9,661 ltmain.sh
osh-native-souffle 97,425,109 9,661 ltmain.sh
osh-native 113,409,134 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 10,812,718 1,679 t4014-format-patch.sh
osh-native 11,862,289 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 12,676,752 3,123 t9300-fast-import.sh
osh-native 13,924,073 3,123 t9300-fast-import.sh
bash 41,138,083 3,123 t9300-fast-import.sh
osh-native-souffle 97,477,040 5,160 test-cmd-util.sh
osh-native 112,727,253 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-72b2aed6
dash dash-0ebcf347
osh-cpython osh-bab6da59
osh-native osh-463f0b8b
osh-native-souffle osh-native-souffle-2de4bc9d
host label host id
no-host no-host-e4839999

Raw Data

filename
no-host.2025-03-25__03-54-48.cachegrind.tsv
no-host.2025-03-25__03-54-48.times.csv