init_shm: shortcut the trivial case of local_size is 1 #7251
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We are going to shortcut the Init_shm implementation when local_size is 1, and it won't handle Init_shm_get when localsize is 1.
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It's simpler to shortcut the trivial case. Set global MPIDU_Init_shm_local_size and MPIDU_Init_shm_local_rank. This prepares the flexibility that later we can extend Init_shm to dynamic processes.
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Pull Request Description
It's simpler to shortcut the trivial case.
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