Hi, I am running into an issue in open-mpi where it crashes abruptly during MPI_WIN_ATTACH.
[nid00307:25463] *** An error occurred in MPI_Win_attach [nid00307:25463] *** reported by process [140736284524545,140728898420736] [nid00307:25463] *** on win rdma window 3 [nid00307:25463] *** MPI_ERR_RMA_ATTACH: Could not attach RMA segment [nid00307:25463] *** MPI_ERRORS_ARE_FATAL (processes in this win will now abort, [nid00307:25463] *** and potentially your MPI job) Looking more into this issue, it seems like open-mpi has a restriction on the maximum number of segments attached to 32. (OpenMpi3.0 spec doesn't spec doesn't say a lot about this scenario --"The argument win must be a window that was created with MPI_WIN_CREATE_DYNAMIC. Multiple (but nonoverlapping) memory regions may be attached to the same window") To workaround this, I have temporarily modified the variable mca_osc_rdma_component.max_attach. Is there any way to configure this in open-mpi? Thanks Udayanga
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