| 1 | #!/usr/bin/env bash
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| 2 | #
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| 3 | # Benchmarks for small shell snippets.
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| 4 | #
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| 5 | # Usage:
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| 6 | # ./micro.sh <function name>
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| 7 | #
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| 8 | # TODO: Publish and HTML report with every release.
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| 9 |
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| 10 | set -o nounset
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| 11 | set -o pipefail
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| 12 | set -o errexit
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| 13 |
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| 14 | # OSH: 583 ms
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| 15 | # bash: 40 ms
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| 16 | # ~10 x
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| 17 | assign-loop() {
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| 18 | time for i in $(seq 10000); do
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| 19 | echo x
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| 20 | done | wc -l
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| 21 | }
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| 22 |
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| 23 | # OSH: 176 ms
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| 24 | # bash: 2 ms!
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| 25 | # This is probably mostly because printf is external!
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| 26 | # ~80x
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| 27 | printf-loop() {
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| 28 | time seq 100 | while read line; do
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| 29 | printf '%s\n' "$line"
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| 30 | done | wc -l
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| 31 | }
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| 32 |
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| 33 | # This microbenchmark justifies the parse_cache member in
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| 34 | # osh/builtin_printf.py.
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| 35 | #
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| 36 | # With the cache, it runs in ~150 ms.
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| 37 | # Without, it runs in ~230 ms.
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| 38 |
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| 39 | printf-loop-complex() {
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| 40 | time seq 1000 | while read line; do
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| 41 | printf 'hello \t %s \t %q\n' "$line" 'x y'
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| 42 | done | wc -l
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| 43 | }
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| 44 |
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| 45 | "$@"
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