That's the correct way to set that environment variable, but I would have to agree with Pavan here. If you're running into the cap on context id's (especially with so few processes) it would seem that you're creating a lot of communicators that you probably don't need. Are you sure that you're freeing them correctly after use? Wesley On Jul 8, 2013, at 10:05 AM, Reem Alraddadi <[email protected]> wrote:

Hi Wesley. I wrote the following: mpirun --np 4 --env MPIR_PARAM_CTXID_EAGER_SIZE 1 ./flash4 but the error still the same. Did I do it in the wrong way??

Thanks, Reem

Message: 5 Date: Mon, 8 Jul 2013 08:14:48 -0500 From: Wesley Bland <[email protected]> To: [email protected] Subject: Re: [mpich-discuss] mpich on Mac os x Message-ID: <[email protected]> Content-Type: text/plain; charset=iso-8859-1

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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