[mpich-discuss] mpich on Mac os x

[Pavan Balaji]

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 <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
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-- 
Pavan Balaji
http://www.mcs.anl.gov/~balaji