Re: [PATCH] backports: speed up building with bash

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On Tue, 2019-12-03 at 16:18 +0100, Johannes Berg wrote:
> On Tue, 2019-12-03 at 16:06 +0100, Johannes Berg wrote:
> > From: Johannes Berg <johannes.berg@xxxxxxxxx>
> > 
> > When building with /bin/sh -> bash, things are SUPER slow (at least
> > for me), because bash takes a LOOONG time to look at the environment
> > variables (and we typically have around 6k), adding ~300ms to each
> > bash invocation for me.
> The real results are like this:
> Completely clean build, after git clean -fdxq, but I have ccache primed
> so all the stuff is build overhead - gcc is ccache and just returns
> directly from the cache.
> without the patch:
> real	9m17.180s
> user	24m38.063s
> sys	0m32.138s
> with the patch:
> real	0m18.157s
> user	0m24.553s
> sys	0m13.342s

That was with bash, with dash:

without the patch:
real	0m33.018s
user	0m56.248s
sys	0m22.898s

with the patch:
real	0m18.113s
user	0m18.036s
sys	0m12.903s


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