Is this the FLASH astrophysics code developed at UC? That code is run with MPICH all the time without issues so one has to assume that your program usage is at least partly causing the problem. Jeff On Mon, Jul 8, 2013 at 9:17 AM, Pavan Balaji <[email protected]> wrote:

Also make sure you are freeing unused communicators.

-- Pavan

On 07/08/2013 08:14 AM, Wesley Bland wrote:

...

It seems that you're creating more communicators than MPICH can handle. It's possible that you might be able to get around this by setting the environment variable MPIR_PARAM_CTXID_EAGER_SIZE to something smaller than its default (which is 2). That frees up a few more communicators, but there is a pathological case where even with fewer communicators than the max, MPICH won't be able to agree on a new communicator id when needed. Try changing that environment variable and see if that fixes things.

Wesley

On Jul 8, 2013, at 5:33 AM, Reem Alraddadi <[email protected]> wrote:

...

Hi all, I am using mpich-3.0.4 on Mac os x version 10.7.5 to run FLASH code. It works fine in the beginning of the run and then I got the following error:

Fatal error in MPI_Comm_create: Other MPI error, error stack: MPI_Comm_create(600).................: MPI_Comm_create(comm=0x84000002, group=0xc8001349, new_comm=0x7fff606a8614) failed MPI_Comm_create(577).................: MPIR_Comm_create_intra(241)..........: MPIR_Get_contextid(799)..............: MPIR_Get_contextid_sparse_group(1146): Cannot allocate context ID because of fragmentation (169/2048 free on this process; ignore_id=0) Fatal error in MPI_Comm_create: Other MPI error, error stack: MPI_Comm_create(600).................: MPI_Comm_create(comm=0x84000002, group=0xc80012b6, new_comm=0x7fff670cc614) failed MPI_Comm_create(577).................: MPIR_Comm_create_intra(241)..........: MPIR_Get_contextid(799)..............: MPIR_Get_contextid_sparse_group(1146): Cannot allocate context ID because of fragmentation (316/2048 free on this process; ignore_id=0) Fatal error in MPI_Comm_create: Other MPI error, error stack: MPI_Comm_create(600).................: MPI_Comm_create(comm=0x84000004, group=0xc800000e, new_comm=0x7fff629d5614) failed MPI_Comm_create(577).................: MPIR_Comm_create_intra(241)..........: MPIR_Get_contextid(799)..............: MPIR_Get_contextid_sparse_group(1146): Cannot allocate context ID because of fragmentation (2020/2048 free on this process; ignore_id=0) Fatal error in MPI_Comm_create: Other MPI error, error stack: MPI_Comm_create(600).................: MPI_Comm_create(comm=0x84000002, group=0xc8000020, new_comm=0x7fff639ae614) failed MPI_Comm_create(577).................: MPIR_Comm_create_intra(241)..........: MPIR_Get_contextid(799)..............: MPIR_Get_contextid_sparse_group(1146): Cannot allocate context ID because of fragmentation (2002/2048 free on this process; ignore_id=0

Is there a way to fix that ?

Thanks, Reem _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss

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-- Pavan Balaji http://www.mcs.anl.gov/~balaji _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss

-- Jeff Hammond [email protected]