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Date: Wed, 23 Aug 2017 17:09:21 +0800
From: Fam Zheng <famz@redhat.com>
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Subject: Re: [Qemu-devel] make check speed
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To: Thomas Huth <thuth@redhat.com>
Cc: Laurent Vivier <lvivier@redhat.com>, Peter Maydell <peter.maydell@linaro.org>, "Michael S. Tsirkin" <mst@redhat.com>, Cornelia Huck <cohuck@redhat.com>, Richard Henderson <richard.henderson@linaro.org>, QEMU Developers <qemu-devel@nongnu.org>, Philippe =?iso-8859-1?Q?Mathieu-Daud=E9?= <f4bug@amsat.org>, Cleber Rosa <crosa@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, =?utf-8?B?THVrw6HFoQ==?= Doktor <ldoktor@redhat.com>, Alex =?iso-8859-1?Q?Benn=E9e?= <alex.bennee@linaro.org>, David Gibson <david@gibson.dropbear.id.au>

On Wed, 08/23 16:52, Fam Zheng wrote:
> On Wed, 08/23 10:35, Thomas Huth wrote:
> > Is it safe nowadays to run "make check -j4" for example? Last time I
> > tried (maybe 1 or 2 years ago), there were still issues since some tests
> > were using hard-coded temporary file names, so the parallel tests were
> > disturbing each other, for example...
> 
> We really should fix them.
> 
> Last year I wanted to get some speed up in patchew's "make check" jobs so I
> tried this:
> 
> https://lists.gnu.org/archive/html/qemu-devel/2016-09/msg07713.html
> 
> On my laptop it can save 50% time as shown in the commit message, unfortunately
> the patch didn't get enough traction, and I've since then rarely used -j in
> "make check" command lines (what?!).

Spoke too soon, I forgot my git-publish hook has been doing "make check -j8" on
all patches I post, and it seems to work well.

Fam