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 2,733
bash 118,863 686
osh-native-souffle 118,863 376
osh-native 118,863 362
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 5 3 8 2,698 Build.sh
osh-native 9 6 3 8 2,698 Build.sh
osh-cpython 297 271 25 21 2,698 Build.sh
dash 2 1 1 1 2,512 abuild
bash 5 4 2 3 2,512 abuild
osh-native-souffle 9 7 2 8 2,512 abuild
osh-native 9 7 2 9 2,512 abuild
osh-cpython 397 374 23 22 2,512 abuild
dash 8 7 2 2 20,489 configure
bash 32 32 0 4 20,489 configure
osh-native-souffle 50 40 10 20 20,489 configure
osh-native 53 44 9 21 20,489 configure
osh-cpython 1,941 1,897 43 43 20,489 configure
dash 21 20 1 2 69,779 configure-coreutils
bash 78 73 5 3 69,779 configure-coreutils
osh-native-souffle 187 160 27 49 69,779 configure-coreutils
osh-native 190 173 18 50 69,779 configure-coreutils
osh-cpython 5,632 5,537 95 87 69,779 configure-coreutils
bash 6 4 1 3 2,029 configure-helper.sh
osh-native 7 4 3 8 2,029 configure-helper.sh
osh-native-souffle 7 4 3 8 2,029 configure-helper.sh
osh-cpython 284 261 23 21 2,029 configure-helper.sh
dash 1 1 0 1 1,733 functions
bash 5 5 0 3 1,733 functions
osh-native-souffle 7 5 2 8 1,733 functions
osh-native 7 3 4 8 1,733 functions
osh-cpython 273 253 20 21 1,733 functions
dash 4 2 2 2 9,661 ltmain.sh
bash 18 18 0 4 9,661 ltmain.sh
osh-native-souffle 21 15 6 15 9,661 ltmain.sh
osh-native 24 22 2 15 9,661 ltmain.sh
osh-cpython 904 869 35 29 9,661 ltmain.sh
dash 1 0 1 1 1,679 t4014-format-patch.sh
osh-native-souffle 4 4 0 7 1,679 t4014-format-patch.sh
bash 4 3 1 3 1,679 t4014-format-patch.sh
osh-native 4 2 2 7 1,679 t4014-format-patch.sh
osh-cpython 111 83 28 19 1,679 t4014-format-patch.sh
dash 1 0 1 1 3,123 t9300-fast-import.sh
osh-native-souffle 4 1 3 7 3,123 t9300-fast-import.sh
osh-native 4 2 2 8 3,123 t9300-fast-import.sh
bash 5 4 1 3 3,123 t9300-fast-import.sh
osh-cpython 118 91 27 19 3,123 t9300-fast-import.sh
bash 16 13 3 3 5,160 test-cmd-util.sh
osh-native-souffle 19 15 4 12 5,160 test-cmd-util.sh
osh-native 20 17 3 12 5,160 test-cmd-util.sh
osh-cpython 799 779 20 27 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 32,963,467 2,698 Build.sh
bash 35,958,882 2,698 Build.sh
osh-native 37,601,607 2,698 Build.sh
dash 7,042,147 2,512 abuild
osh-native-souffle 38,799,988 2,512 abuild
bash 43,761,475 2,512 abuild
osh-native 45,323,741 2,512 abuild
dash 53,261,640 20,489 configure
osh-native-souffle 241,640,562 20,489 configure
osh-native 276,283,476 20,489 configure
bash 349,702,388 20,489 configure
dash 151,770,612 69,779 configure-coreutils
osh-native-souffle 782,429,546 69,779 configure-coreutils
osh-native 880,788,424 69,779 configure-coreutils
bash 886,197,417 69,779 configure-coreutils
osh-native-souffle 26,543,332 2,029 configure-helper.sh
osh-native 30,640,738 2,029 configure-helper.sh
bash 47,119,375 2,029 configure-helper.sh
dash 4,652,224 1,733 functions
osh-native-souffle 24,867,670 1,733 functions
bash 28,169,399 1,733 functions
osh-native 28,976,172 1,733 functions
dash 23,597,230 9,661 ltmain.sh
osh-native-souffle 97,427,605 9,661 ltmain.sh
osh-native 113,411,146 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 10,813,652 1,679 t4014-format-patch.sh
osh-native 11,863,415 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 12,677,685 3,123 t9300-fast-import.sh
osh-native 13,925,045 3,123 t9300-fast-import.sh
bash 41,138,083 3,123 t9300-fast-import.sh
osh-native-souffle 97,489,006 5,160 test-cmd-util.sh
osh-native 112,739,711 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-8bf24435
dash dash-0ebcf347
osh-cpython osh-e5bbf334
osh-native osh-1c7c4f3c
osh-native-souffle osh-native-souffle-5c6731c4
host label host id
no-host no-host-e4839999

Raw Data

filename
no-host.2025-03-26__22-48-55.cachegrind.tsv
no-host.2025-03-26__22-48-55.times.csv