[mpich-discuss] mpich on Mac os x

[Wesley Bland]

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 <raba500 at york.ac.uk> 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     discuss at mpich.org
> To manage subscription options or unsubscribe:
> https://lists.mpich.org/mailman/listinfo/discuss