coll: update the json selection of MPIR_Bcast_intra_scatter_ring_allgather #7332
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For some algorithm, e.g. MPIR_Bcast_intra_scatter_ring_allgather, what matters is not message size, but message size per process, since that determines whether each round is bandwidth-bound.
The MPIR_Bcast_intra_scatter_ring_allgather won't perform if the per_proc_msg_size (chunk size) is too small, which accumulates latency in each round.
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Did you do a performance test with this, or are these changes just based on the conversation earlier this week? Its on my TODOs to do some performance runs on Aurora, so I can try testing this too |
Thanks for volunteering! :) The patch is to address the obvious issue so it don't perform outrageously bad. Yes, we should use tests to finetune the threshold. |
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Pull Request Description
The MPIR_Bcast_intra_scatter_ring_allgather won't perform if the
per_proc_msg_size (chunk size) is too small, which accumulates latency
in each round.
Fixes #7330
[skip warnings]
Author Checklist
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