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Subject: [bug#27850] gnu: mpi: openmpi: Don't enable thread-multiple
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From: Dave Love <fx@gnu.org>
References: <87wp6thqjc.fsf@i-ulialbion.it.manchester.ac.uk>
	<87379c4oxs.fsf@gnu.org>
Date: Mon, 31 Jul 2017 19:09:15 +0100
In-Reply-To: <87379c4oxs.fsf@gnu.org> ("Ludovic
	\=\?iso-8859-1\?Q\?Court\=E8s\?\=
	\=\?iso-8859-1\?Q\?\=22's\?\= message of "Mon, 31
	Jul 2017 17:16:15 +0200")
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To: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludovic.courtes@inria.fr>
Cc: 27850@debbugs.gnu.org

Ludovic Court=E8s <ludovic.courtes@inria.fr> writes:

>> diff --git a/gnu/packages/mpi.scm b/gnu/packages/mpi.scm
>> index 54fdd35ad..678d7dd88 100644
>> --- a/gnu/packages/mpi.scm
>> +++ b/gnu/packages/mpi.scm
>> @@ -130,10 +130,10 @@ bind processes, and much more.")
>>      (native-inputs
>>       `(("pkg-config" ,pkg-config)
>>         ("perl" ,perl)))
>> +    (outputs '("out" "lib" "debug"))
>
> This should go to a separate patch.

Yes, that's a mistake, and I'd actually forgotten I'd sent the patch.
(I detest git.)  I have a new version to send, which I'll edit for the
nitpicks.

>>      (arguments
>>       `(#:configure-flags `("--enable-static"
>>=20=20
>> -                           "--enable-mpi-thread-multiple"
>
> Should we upgrade our openmpi package instead of doing this?

I don't know whether they've fixed all the breakage I knew about in
OMPI 2 or whether there's still any penalty from thread-multiple.  1.10
seems fairly safe, but I don't have strong opinions if people think 2 is
solid.  Apart from ABI incompatibility, I assume it has the usual
incompatibilities at the mpirun/MCA level, and that they aren't well
documented.