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Re: [PATCH] m4sh: prefer bash over sh

From: Ross Burton
Subject: Re: [PATCH] m4sh: prefer bash over sh
Date: Mon, 23 Mar 2020 16:11:13 +0000

On Mon, 23 Mar 2020 at 15:12, Zack Weinberg <address@hidden> wrote:
> Ignoring what I just said in the other thread, a patch like this would
> be a lot more compelling if it came with some performance
> measurements.  Do you have time to find out whether bash is, in fact,
> faster at executing long configure scripts than dash?

You're absolutely right that I should provide evidence.  We didn't
make this change for no real reason but the underlying assumptions may
be historical.  gettext is my favourite pathological test as it runs
several nested configure scripts.

$ export CONFIG_SHELL=/bin/dash
$ hyperfine  '$CONFIG_SHELL configure'
Benchmark #1: $CONFIG_SHELL configure
  Time (mean ± σ):     50.530 s ±  0.188 s    [User: 28.922 s, System: 13.621 s]
  Range (min … max):   50.207 s … 50.868 s    10 runs

$ export CONFIG_SHELL=/bin/bash
$ hyperfine  '$CONFIG_SHELL configure'
Benchmark #1: $CONFIG_SHELL configure
  Time (mean ± σ):     55.853 s ±  0.214 s    [User: 32.428 s, System: 16.291 s]
  Range (min … max):   55.578 s … 56.276 s    10 runs

Consider this patch retracted.


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