https://github.com/neved4/pdksh-perf
💡 Performance differences in pdksh-derived shells
https://github.com/neved4/pdksh-perf
Last synced: about 2 months ago
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💡 Performance differences in pdksh-derived shells
- Host: GitHub
- URL: https://github.com/neved4/pdksh-perf
- Owner: Neved4
- Created: 2023-10-18T22:30:32.000Z (over 1 year ago)
- Default Branch: main
- Last Pushed: 2023-10-24T11:27:54.000Z (over 1 year ago)
- Last Synced: 2025-02-05T23:25:37.244Z (3 months ago)
- Language: Shell
- Homepage:
- Size: 1.95 KB
- Stars: 1
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# `pdksh-perf` - printf performance in `oksh`, `mksh`, `posh`
Some performance differences in `pdksh`-derived shells.
### Getting Started
To benchmark these, install [`hyperfine`], then run:
```sh
for i in mksh oksh
do
hyperfine -w32 -r64 -S none --sort mean-time -L shell $i \
'{shell} ./bg_for.ksh' '{shell} ./bg_printf.ksh' '{shell} ./bg_while.ksh'
done
```
#### Output
```log
Summary
mksh ./bg_for.ksh ran
1.04 ± 0.08 times faster than mksh ./bg_while.ksh
4.04 ± 0.25 times faster than mksh ./bg_printf.ksh
oksh ./bg_for.ksh ran
1.01 ± 0.07 times faster than oksh ./bg_while.ksh
2.20 ± 0.14 times faster than oksh ./bg_printf.ksh
```
These benchmarks can be reproduced in `oksh 7.3` and `mksh 59c`. The `posh 0.14.1` shell lacks a built-in `print`. All of them come originally from `pdksh`.
Without using the `print` built-in, execution slows down by a factor of 3X. With a more [detailed table], execution drops significantly to **[110X times slower]**. These disparities disappeared once the `print` function was introduced.
[`hyperfine`]: https://github.com/sharkdp/hyperfine/tree/master
[detailed table]: https://github.com/Neved4/color.sh/blob/main/src/color.sh
[110X times slower]: https://github.com/Neved4/color.sh/blob/main/src/bench.md