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From: Johannes Berg <johannes@sipsolutions.net>
To: backports@vger.kernel.org
Subject: Re: [PATCH] backports: speed up building with bash
Date: Tue, 03 Dec 2019 16:21:08 +0100
Message-ID: <757c854e78543992b5110208517cd8d3ca8e9414.camel@sipsolutions.net> (raw)
In-Reply-To: <1bef9e95439caedef7dd2252b5414035e370f7b7.camel@sipsolutions.net> (sfid-20191203_161831_359846_43C56C36)

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@intel.com>
> > 
> > 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

johannes

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Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-03 15:06 Johannes Berg
2019-12-03 15:15 ` Johannes Berg
2019-12-03 15:18 ` Johannes Berg
2019-12-03 15:21   ` Johannes Berg [this message]

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