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 2,734
bash 118,863 704
osh-native-souffle 118,863 474
osh-native 118,863 442
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 5 4 1 3 2,698 Build.sh
osh-native-souffle 7 3 4 8 2,698 Build.sh
osh-native 8 6 2 8 2,698 Build.sh
osh-cpython 290 271 19 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 5 3 8 2,512 abuild
osh-native 9 5 4 9 2,512 abuild
osh-cpython 390 363 27 22 2,512 abuild
dash 8 7 1 2 20,489 configure
bash 32 30 2 3 20,489 configure
osh-native-souffle 40 33 6 21 20,489 configure
osh-native 44 36 8 21 20,489 configure
osh-cpython 1,833 1,795 38 43 20,489 configure
dash 21 20 1 2 69,779 configure-coreutils
bash 78 77 1 3 69,779 configure-coreutils
osh-native-souffle 141 115 26 50 69,779 configure-coreutils
osh-native 148 130 18 50 69,779 configure-coreutils
osh-cpython 5,383 5,296 87 87 69,779 configure-coreutils
bash 5 5 0 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 276 250 26 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 5 2 8 1,733 functions
osh-cpython 269 245 23 21 1,733 functions
dash 4 3 1 2 9,661 ltmain.sh
bash 17 17 0 4 9,661 ltmain.sh
osh-native-souffle 19 14 5 15 9,661 ltmain.sh
osh-native 21 15 6 15 9,661 ltmain.sh
osh-cpython 881 849 32 29 9,661 ltmain.sh
dash 1 1 0 1 1,679 t4014-format-patch.sh
bash 3 3 1 3 1,679 t4014-format-patch.sh
osh-native-souffle 4 2 2 7 1,679 t4014-format-patch.sh
osh-native 4 2 2 7 1,679 t4014-format-patch.sh
osh-cpython 106 91 15 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 3 8 3,123 t9300-fast-import.sh
bash 5 4 1 3 3,123 t9300-fast-import.sh
osh-cpython 109 94 15 19 3,123 t9300-fast-import.sh
bash 15 14 1 3 5,160 test-cmd-util.sh
osh-native-souffle 16 13 3 12 5,160 test-cmd-util.sh
osh-native 18 12 6 12 5,160 test-cmd-util.sh
osh-cpython 786 760 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 32,965,586 2,698 Build.sh
bash 35,958,882 2,698 Build.sh
osh-native 37,603,536 2,698 Build.sh
dash 7,042,147 2,512 abuild
osh-native-souffle 38,802,147 2,512 abuild
bash 43,761,475 2,512 abuild
osh-native 45,325,680 2,512 abuild
dash 53,261,640 20,489 configure
osh-native-souffle 241,644,356 20,489 configure
osh-native 276,286,653 20,489 configure
bash 349,702,388 20,489 configure
dash 151,770,612 69,779 configure-coreutils
osh-native-souffle 782,435,497 69,779 configure-coreutils
osh-native 880,793,807 69,779 configure-coreutils
bash 886,197,417 69,779 configure-coreutils
osh-native-souffle 26,545,098 2,029 configure-helper.sh
osh-native 30,642,302 2,029 configure-helper.sh
bash 47,119,375 2,029 configure-helper.sh
dash 4,652,224 1,733 functions
osh-native-souffle 24,870,288 1,733 functions
bash 28,169,399 1,733 functions
osh-native 28,977,748 1,733 functions
dash 23,597,230 9,661 ltmain.sh
osh-native-souffle 97,429,828 9,661 ltmain.sh
osh-native 113,413,547 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 10,815,004 1,679 t4014-format-patch.sh
osh-native 11,864,693 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 12,679,117 3,123 t9300-fast-import.sh
osh-native 13,926,305 3,123 t9300-fast-import.sh
bash 41,138,083 3,123 t9300-fast-import.sh
osh-native-souffle 97,491,692 5,160 test-cmd-util.sh
osh-native 112,742,182 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-dd4c9e24
dash dash-0ebcf347
osh-cpython osh-3f55d5d5
osh-native osh-c558b0b9
osh-native-souffle osh-native-souffle-c136e465
host label host id
no-host no-host-e4839999

Raw Data

filename
no-host.2025-03-29__13-15-28.cachegrind.tsv
no-host.2025-03-29__13-15-28.times.csv