Re: [PATCH] backports: speed up building with bash
Johannes Berg <[email protected]>
| Newsgroups | org.kernel.vger.backports |
|---|---|
| Message-ID | <[email protected]> |
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 <[email protected]> > > > > 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 -- To unsubscribe from this list: send the line "unsubscribe backports" in