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Date: Wed, 31 Oct 2012 18:52:26 +0100 From: Pavel Machek <pavel@....cz> To: Ingo Molnar <mingo@...nel.org> Cc: David Ahern <dsahern@...il.com>, git@...r.kernel.org, Arnaldo Carvalho de Melo <acme@...radead.org>, linux-kernel@...r.kernel.org, Andrew Vagin <avagin@...nvz.org>, Borislav Petkov <bp@...64.org>, David Howells <dhowells@...hat.com>, Frederic Weisbecker <fweisbec@...il.com>, Jiri Olsa <jolsa@...hat.com>, Namhyung Kim <namhyung@...nel.org>, Paul Mackerras <paulus@...ba.org>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Stephane Eranian <eranian@...il.com>, Steven Rostedt <rostedt@...dmis.org>, arnaldo.melo@...il.com, Arnaldo Carvalho de Melo <acme@...hat.com> Subject: Re: 'git describe' is very slow on development trees with lots of commits Hi! > (Cc:-ed the Git development list.) > > * David Ahern <dsahern@...il.com> wrote: > > > PERF-VERSION-GEN and specifically the git commands are the > > cause of more delay than the config checks, especially when > > doing the build in a VM with the kernel source on an NFS > > mount. > > Yes, I have noticed that too. .... > The cost on this pretty fast machine is about 1 msecs per commit > - which adds up to about 2.5 seconds during much of the > development cycle. Well... I noticed my builds when little changed are very slow... and it was due to the computation of version string. Ouch. pavel@amd:~/mainline-altera/linux$ time git describe fixes-for-linus-506-g71ca8691 0.68user 0.22system 27.82 (0m27.820s) elapsed 3.26%CPU pavel@amd:~/mainline-altera/linux$ (Cached it is more reasonable 3 seconds, but it keeps going out of cache all the time. Uncached clean build is 3 minutes, cached is 9 seconds + time to do git describe). Thikpad X60. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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