[mpich-discuss] Issue with MPI_Comm_spawn_multiple

[Seo, Sangmin]

Hi Toni,

We figured out the reason (the spawned processes hang because when the "hosts" info keys for two commands have the same value (e.g., localhost) two processes get the same rank.), but it seems it will take some time to fix this. Pavan will rewrite the problematic part in hydra.

I’ve created a ticket (https://trac.mpich.org/projects/mpich/ticket/2308) for this issue and cc’ed you in the ticket.

Regards,
Sangmin


On Oct 8, 2015, at 10:17 AM, Antonio J. Peña <antonio.pena at bsc.es<mailto:antonio.pena at bsc.es>> wrote:


Thanks a lot Sangmin!


On 10/08/2015 03:43 PM, Seo, Sangmin wrote:
Hi Toni,

I confirmed the problem and am looking into it. I will get back to you after I resolve it.

Regards,
Sangmin


On Oct 6, 2015, at 7:23 AM, Antonio J. Peña <antonio.pena at bsc.es<mailto:antonio.pena at bsc.es>> wrote:


Right, but I do need to use the hosts key to get control of where the processes are spawned. Any clue?


On 10/02/2015 07:32 PM, Thakur, Rajeev wrote:
Looks like it is related to the hosts key. Works without that.

Rajeev

On Oct 2, 2015, at 10:34 AM, Antonio J. Peña <antonio.pena at bsc.es<mailto:antonio.pena at bsc.es>> wrote:

Hi folks!

I've been facing an issue with MPI_Comm_spawn_multiple when all the
following conditions are met:

 1. 'count' is > 1
 2. Any value of 'array_of_maxprocs' is > 1
 3. Setting the "hosts" info key

What I'm finding is that the spawned processes hang at MPI_Init. Find
attached a test case. You can reproduce my issue with -np 1.

Is there anything I'm doing wrong? I'm using MPICH master at 1e6c4d8. I
haven't found a pending ticket, xfail test, or test case covering this
situation.

All the best,
  Toni

[P.S.: It still feels weird to be on the other side of discuss at mpich.org<mailto:discuss at mpich.org>]

--
Antonio J. Peña
Senior Researcher
Barcelona Supercomputing Center



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