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 7.3
dash 111,674 2.4
osh-native 118,863 12.4
osh-native-souffle 118,863 11.0

(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 2,600
bash 118,863 1,273
osh-native-souffle 118,863 504
osh-native 118,863 468
osh-cpython 118,863 10

Per-File Measurements

Time and Memory

shell label elapsed ms user ms sys ms max rss MB num lines filename
dash 2 2 0 2 2,698 Build.sh
bash 3 2 1 3 2,698 Build.sh
osh-native-souffle 7 6 1 9 2,698 Build.sh
osh-native 7 4 4 9 2,698 Build.sh
osh-cpython 313 298 15 21 2,698 Build.sh
dash 2 1 1 2 2,512 abuild
bash 4 2 2 3 2,512 abuild
osh-native-souffle 8 4 4 9 2,512 abuild
osh-native 8 8 0 9 2,512 abuild
osh-cpython 423 400 23 22 2,512 abuild
dash 9 8 1 2 20,489 configure
bash 17 16 1 4 20,489 configure
osh-native-souffle 39 28 11 21 20,489 configure
osh-native 41 32 9 21 20,489 configure
osh-cpython 2,072 2,038 34 44 20,489 configure
dash 23 23 0 2 69,779 configure-coreutils
bash 42 41 1 4 69,779 configure-coreutils
osh-native-souffle 130 108 21 50 69,779 configure-coreutils
osh-native 141 119 22 50 69,779 configure-coreutils
osh-cpython 5,985 5,918 66 91 69,779 configure-coreutils
bash 3 2 2 3 2,029 configure-helper.sh
osh-native-souffle 6 4 2 9 2,029 configure-helper.sh
osh-native 6 3 3 9 2,029 configure-helper.sh
osh-cpython 297 269 28 21 2,029 configure-helper.sh
dash 1 1 0 1 1,733 functions
bash 3 2 1 3 1,733 functions
osh-native-souffle 6 3 3 8 1,733 functions
osh-native 6 4 2 9 1,733 functions
osh-cpython 291 265 26 21 1,733 functions
dash 4 4 0 2 9,661 ltmain.sh
bash 9 9 0 4 9,661 ltmain.sh
osh-native-souffle 18 9 9 15 9,661 ltmain.sh
osh-native 19 13 6 16 9,661 ltmain.sh
osh-cpython 961 934 26 29 9,661 ltmain.sh
dash 1 0 1 1 1,679 t4014-format-patch.sh
bash 2 1 1 3 1,679 t4014-format-patch.sh
osh-native-souffle 4 3 1 7 1,679 t4014-format-patch.sh
osh-native 4 2 2 8 1,679 t4014-format-patch.sh
osh-cpython 109 88 22 19 1,679 t4014-format-patch.sh
dash 1 1 0 1 3,123 t9300-fast-import.sh
bash 2 2 1 3 3,123 t9300-fast-import.sh
osh-native-souffle 4 1 3 8 3,123 t9300-fast-import.sh
osh-native 4 0 4 8 3,123 t9300-fast-import.sh
osh-cpython 119 101 19 19 3,123 t9300-fast-import.sh
bash 8 7 1 3 5,160 test-cmd-util.sh
osh-native-souffle 16 12 4 12 5,160 test-cmd-util.sh
osh-native 17 10 7 13 5,160 test-cmd-util.sh
osh-cpython 878 853 25 28 5,160 test-cmd-util.sh

Instruction Counts

shell label irefs num lines filename
dash 6,683,550 2,698 Build.sh
bash 19,397,953 2,698 Build.sh
osh-native-souffle 31,029,916 2,698 Build.sh
osh-native 35,340,995 2,698 Build.sh
dash 7,343,949 2,512 abuild
bash 23,565,556 2,512 abuild
osh-native-souffle 36,278,608 2,512 abuild
osh-native 42,304,695 2,512 abuild
dash 55,988,249 20,489 configure
bash 166,228,288 20,489 configure
osh-native-souffle 230,513,858 20,489 configure
osh-native 262,822,815 20,489 configure
dash 161,007,687 69,779 configure-coreutils
bash 440,577,808 69,779 configure-coreutils
osh-native-souffle 753,049,390 69,779 configure-coreutils
osh-native 844,512,592 69,779 configure-coreutils
bash 22,785,798 2,029 configure-helper.sh
osh-native-souffle 24,675,024 2,029 configure-helper.sh
osh-native 28,503,407 2,029 configure-helper.sh
dash 4,811,021 1,733 functions
bash 15,304,971 1,733 functions
osh-native-souffle 23,050,271 1,733 functions
osh-native 26,864,825 1,733 functions
dash 24,901,464 9,661 ltmain.sh
bash 80,225,385 9,661 ltmain.sh
osh-native-souffle 91,936,396 9,661 ltmain.sh
osh-native 106,833,845 9,661 ltmain.sh
dash 3,292,797 1,679 t4014-format-patch.sh
osh-native-souffle 9,909,381 1,679 t4014-format-patch.sh
osh-native 10,889,911 1,679 t4014-format-patch.sh
bash 11,084,082 1,679 t4014-format-patch.sh
dash 4,583,408 3,123 t9300-fast-import.sh
osh-native-souffle 11,713,219 3,123 t9300-fast-import.sh
osh-native 12,894,313 3,123 t9300-fast-import.sh
bash 16,672,903 3,123 t9300-fast-import.sh
bash 73,188,823 5,160 test-cmd-util.sh
osh-native-souffle 92,391,455 5,160 test-cmd-util.sh
osh-native 106,871,573 5,160 test-cmd-util.sh

Shell and Host Details

shell label shell id
bash bash-eec00a4c
dash dash-cea41b3e
osh-cpython osh-da97606d
osh-native osh-c88396bf
osh-native-souffle osh-native-souffle-42ac59b0
host label host id
no-host no-host-2411472

Raw Data

filename
no-host.2025-05-15__17-15-10.cachegrind.tsv
no-host.2025-05-15__17-15-10.times.csv