Sorry should be corrected as MPI3.0 spec [1] [1] https://www.mpi-forum.org/docs/mpi-3.0/mpi30-report.pdf ; page=443
Best Regards, Udayanga On Tue, Jan 8, 2019 at 11:36 PM Udayanga Wickramasinghe <uswic...@iu.edu> wrote: > 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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