BTW, is Cray SeaStar2+ better than IB - for nodes w/many cores ?
BW seems like a SeaStar2+ advantage, though I haven't seen any
discussion of latency or message rate.
And I didn't see latencies comparison for SeaStar vs IB.
my guess is that for short routes, seastar is competitive,
but can fall behind on large machines (long routes).
regardless of how tight the seastar per-hop latency is,
IB has 2.5x the per-hop fanout (2or 3 outgoing 9.6 GB links
versus 18 outgoing 4 GB/s links). higher radix means an
advantage that increases with size.
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