Re: [Starpu-devel] [Morse-devel] MPI tags limitation with Starpu

[Mathieu Faverge <mathieu.faverge@inria.fr>]

Hello Sameh,

Can't you reuse the descriptor multiple times, as I suggested ?

Mathieu


Le 21/02/2017 à 11:28, Sameh Abdulah a écrit :

Hello,

I check our system and I found that we rely on cray mpich and this gives me only 21 bits not 31 bits for tag width. if I need to cover all my tiles I need 19 bits out of 21 bits and 2 bits only will not be enough for my descriptors.  Can you advice me what to do?

--Sameh

On Mon, Feb 20, 2017 at 5:24 PM, Sameh Abdulah <sameh.abdulah@kaust.edu.sa> wrote:

Thanks guys for your help. I will try Mathieu's solutions and I will come back to you.

--Sameh

On Mon, Feb 20, 2017 at 4:36 PM, Samuel Thibault <samuel.thibault@inria.fr> wrote:
Hello,

Mathieu Faverge, on lun. 20 févr. 2017 11:28:58 +0100, wrote:
> Be careful, if you MPI implementation allows less than 31 bits,

Starting with StarPU 1.2, we use our own tag support, which always
includes 32bits, so that should not be a problem. We could also increase
that to 64bit.

Samuel

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