linux-kernel - Re: [PATCH 0/6] perf tools: Improve 'make build-test'

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Date:	Mon, 11 Jan 2016 09:46:08 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	"Wangnan (F)" <wangnan0@...wei.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>, jolsa@...nel.org,
	namhyung@...nel.or, lizefan@...wei.com, pi3orama@....com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/6] perf tools: Improve 'make build-test'

On Mon, Jan 11, 2016 at 10:55:50AM +0800, Wangnan (F) wrote:
> Hi Jiri,
> 
> I think if we can fold the feature checking in build-test then
> it can be even faster. We need only 2 feature check result (for
> normal building and static building), but in a full build-test
> we run 138 rounds feature checking. Would you please give some
> help on it?

I think we can add separate target that will skip the feature
detection, given that there's extra call before generating
FEATURE-DUMP file.. I'll check on this

> 
> Now I have a 160 cores server for building perf, currently busy
> time and idle time are 5:3 (result from top. I use 1s interval.
> Each test case takes about 8s,  in about 5 seconds I can see
> full of 'cc1' in perf top result). A full test-build still require
> more than 0.3 hours (8s * 34 cases * 2 (with and without O) *
> 2 (Makefile and Makefile.perf) = 1088 seconds).

nice

thanks,
jirka