[mvapich-discuss] Increasing the number of RMA windows

[Chaitra Kumar]

Hi Team,

We have a requirement to create more than 500 RMA windows.  We are using
the variable: MV2_MAX_NUM_WIN to increase the number of RMA windows during
MPI program launch.  But we are getting error even after setting the
variable.

Is there any upper limit on the number of RMA windows which can be created
by an MPI program?
Is there any other way to increase the number of RMA windows?

The error we are getting is:

[cli_383]: aborting job:

Fatal error in MPI_Win_create:

Other MPI error, error stack:

MPI_Win_create(189)..................: MPI_Win_create(base=0x7f8095c3a010,
size=1073741824, disp_unit=1, info=0x9c000000, comm=0xc4001344,
win=0x2611a38) failed

MPID_Win_create(95)..................:

win_init(281)........................:

MPIR_Comm_dup_impl(71)...............:

MPIR_Comm_copy(1651).................:

MPIR_Get_contextid(878)..............:

MPIR_Get_contextid_sparse_group(1242):  Cannot allocate context ID because
of fragmentation (279/2048 free on this process; ignore_id=0)



[cli_434]: aborting job:

Fatal error in MPI_Win_create:

Other MPI error, error stack:

MPI_Win_create(189)..................: MPI_Win_create(base=0x7fd6c9c87010,
size=1073741824, disp_unit=1, info=0x9c000000, comm=0xc400111d,
win=0x24caa38) failed

MPID_Win_create(95)..................:

win_init(281)........................:

MPIR_Comm_dup_impl(71)...............:

MPIR_Comm_copy(1651).................:

MPIR_Get_contextid(878)..............:

MPIR_Get_contextid_sparse_group(1242):  Cannot allocate context ID because
of fragmentation (344/2048 free on this process; ignore_id=0)


Thanks for your help.



Regards,

Chaitra
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