From: Jeff King <peff@peff.net>
Date: Wed, 24 Jan 2018 19:51:22 GMT
Subject: Re: [PATCH 4/5] travis-ci: don't run the test suite as root in the 32 bit Linux build
Message-ID: <20180124195122.GA7278@sigill.intra.peff.net>
In-Reply-To: <20180124180142.GA26290@sigill.intra.peff.net>

On Wed, Jan 24, 2018 at 01:01:42PM -0500, Jeff King wrote:

> Just for fun, I tried running:
> 
>   cd t
>   best-of-five make GIT_PROVE_OPTS='-j3'
>   best-of-five make GIT_PROVE_OPTS='-j3 --state=slow,save'
>   best-of-five make GIT_PROVE_OPTS='-j3 --shuffle'
> [...]
> I wonder what is different between my setup and Travis. I guess one
> is that I use a tmpfs for the test-root. I wonder if that could throw
> off the relative timings, or the importance of parallelization.

I just tried again without a tmpfs (actually, with
GIT_TEST_OPTS=--verbose-log, which matches Travis) and still got the
"prove" version as only about 10s faster. So I dunno. My disk is an SSD,
so that probably _is_ faster than Travis's disks, and maybe that would
matter.

I'm giving up on finding it. If you happen to have a recipe for
reproducing a larger speedup with "--state=slow,save", I'd be curious to
see it. But don't spend much time on it on my account. The existing
prove-caching setup is there and working, so even in the worst case if
it's not helping, it's not actively hurting much.

-Peff