Re: [PATCH] parallelize g++ testing a bit more

[Jakub Jelinek <jakub at redhat dot com>]

On Mon, Jun 20, 2011 at 09:28:56AM -0400, Jason Merrill wrote:
> On 06/17/2011 08:20 PM, Mike Stump wrote:
> >On Jun 17, 2011, at 10:47 AM, Nathan Froyd wrote:
> >>I've done a lot of g++-only testsuite runs lately
> >
> >I think it is reasonable to have even more of them, say, if you have 16 cores and just test c++...  I wonder what the scaling is like as we approach larger N.  :-)
> 
> In my test runs, one of the libstdc++ batches (normal3) takes longer
> than any of the g++ batches, so breaking that up would be more
> effective for me.  :)

Yeah, certainly, libstdc++ needs more parallelization most.
But, as I wrote already to Rainer in Autumn, the methodology
for splitting things up should be on a fast box look at
the time spent in each of the parts as reported by dejagnu
in the log files, and split it to make the jobs roughly even
sized with not overcomplicated patterns.

Here are some numbers from my last x86_64-linux regtest.

>From these numbers, I'd say the first parallelization changes
should be split gcc/execute.exp testing from 2 to 4 parallel jobs,
gcc/compile.exp from one to 2, gfortran/dg.exp from 3 to 6 and
libstdc++-v3/conformance.exp from 4 to 8 or 10.
Everything else is much less important.

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	Jakub