v2.0.x: group: Fix ompi_group_have_remote_peers
#3532
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`ompi_group_t::grp_proc_pointers[i]` may have sentinel values even for processes which reside in the local node because the array for `MPI_COMM_WORLD` is set up before `ompi_proc_complete_init`, which allocates `ompi_proc_t` objects for processes reside in the local node, is called in `MPI_INIT`. So using `ompi_proc_is_sentinel` against `ompi_group_t::grp_proc_pointers[i]` in order to determine whether the process resides in a remote node is not appropriate. This bug sometimes causes an `MPI_ERR_RMA_SHARED` error when `MPI_WIN_ALLOCATE_SHARED` is called, where sm OSC uses `ompi_group_have_remote_peers`. Signed-off-by: KAWASHIMA Takahiro <t-kawashima@jp.fujitsu.com> (cherry picked from commit e453e42)
hjelmn
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May 16, 2017
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@bwbarrett @hppritcha Merging this PR means that you also need to merge the v3.0.x equivalent (#3530). But otherwise: @hppritcha good to go |
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@hjelmn Could you review?
Corresponding master PR: #3489.
(cherry picked from commit e453e42)