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 2,800
bash 118,863 708
osh-native-souffle 118,863 444
osh-native 118,863 421
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 4 4 1 3 2,698 Build.sh
osh-native-souffle 7 5 2 8 2,698 Build.sh
osh-native 8 6 2 8 2,698 Build.sh
osh-cpython 284 260 25 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 6 2 8 2,512 abuild
osh-native 9 6 3 8 2,512 abuild
osh-cpython 382 354 27 22 2,512 abuild
dash 8 8 0 2 20,489 configure
bash 32 32 0 4 20,489 configure
osh-native-souffle 40 32 8 21 20,489 configure
osh-native 44 35 9 21 20,489 configure
osh-cpython 1,841 1,800 41 43 20,489 configure
dash 21 20 1 2 69,779 configure-coreutils
bash 77 76 1 3 69,779 configure-coreutils
osh-native-souffle 157 137 21 49 69,779 configure-coreutils
osh-native 161 135 26 50 69,779 configure-coreutils
osh-cpython 5,379 5,289 90 87 69,779 configure-coreutils
bash 5 4 1 3 2,029 configure-helper.sh
osh-native-souffle 6 5 1 8 2,029 configure-helper.sh
osh-native 7 4 3 8 2,029 configure-helper.sh
osh-cpython 265 248 17 21 2,029 configure-helper.sh
dash 1 1 0 1 1,733 functions
bash 4 4 0 3 1,733 functions
osh-native-souffle 6 3 3 8 1,733 functions
osh-native 7 4 2 8 1,733 functions
osh-cpython 263 241 22 21 1,733 functions
dash 4 4 0 2 9,661 ltmain.sh
bash 16 14 3 4 9,661 ltmain.sh
osh-native-souffle 19 14 5 15 9,661 ltmain.sh
osh-native 21 16 5 15 9,661 ltmain.sh
osh-cpython 854 831 23 29 9,661 ltmain.sh
dash 1 0 1 1 1,679 t4014-format-patch.sh
bash 4 2 1 3 1,679 t4014-format-patch.sh
osh-native-souffle 4 3 1 7 1,679 t4014-format-patch.sh
osh-native 4 0 4 7 1,679 t4014-format-patch.sh
osh-cpython 104 84 20 19 1,679 t4014-format-patch.sh
dash 1 1 0 1 3,123 t9300-fast-import.sh
osh-native-souffle 4 2 2 7 3,123 t9300-fast-import.sh
osh-native 4 3 1 7 3,123 t9300-fast-import.sh
bash 5 3 1 3 3,123 t9300-fast-import.sh
osh-cpython 113 93 18 19 3,123 t9300-fast-import.sh
bash 15 14 1 3 5,160 test-cmd-util.sh
osh-native-souffle 16 15 1 12 5,160 test-cmd-util.sh
osh-native 18 11 7 12 5,160 test-cmd-util.sh
osh-cpython 785 762 23 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 32,964,093 2,698 Build.sh
bash 35,958,882 2,698 Build.sh
osh-native 37,602,310 2,698 Build.sh
dash 7,042,147 2,512 abuild
osh-native-souffle 38,800,672 2,512 abuild
bash 43,761,475 2,512 abuild
osh-native 45,324,396 2,512 abuild
dash 53,261,640 20,489 configure
osh-native-souffle 241,641,388 20,489 configure
osh-native 276,284,025 20,489 configure
bash 349,702,388 20,489 configure
dash 151,770,612 69,779 configure-coreutils
osh-native-souffle 782,431,184 69,779 configure-coreutils
osh-native 880,789,927 69,779 configure-coreutils
bash 886,197,417 69,779 configure-coreutils
osh-native-souffle 26,543,937 2,029 configure-helper.sh
osh-native 30,641,404 2,029 configure-helper.sh
bash 47,119,375 2,029 configure-helper.sh
dash 4,652,224 1,733 functions
osh-native-souffle 24,869,142 1,733 functions
bash 28,169,399 1,733 functions
osh-native 28,976,842 1,733 functions
dash 23,597,230 9,661 ltmain.sh
osh-native-souffle 97,428,297 9,661 ltmain.sh
osh-native 113,411,853 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 10,814,241 1,679 t4014-format-patch.sh
osh-native 11,864,091 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 12,678,270 3,123 t9300-fast-import.sh
osh-native 13,925,661 3,123 t9300-fast-import.sh
bash 41,138,083 3,123 t9300-fast-import.sh
osh-native-souffle 97,489,842 5,160 test-cmd-util.sh
osh-native 112,739,005 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-e4a066bc
dash dash-0ebcf347
osh-cpython osh-88f40618
osh-native osh-561daf83
osh-native-souffle osh-native-souffle-d2a39d33
host label host id
no-host no-host-e4839999

Raw Data

filename
no-host.2025-03-27__16-53-38.cachegrind.tsv
no-host.2025-03-27__16-53-38.times.csv