[Beowulf] Why is communication so expensive for very small messages?
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Mark Hahn hahn at mcmaster.caTue Apr 24 12:15:00 PDT 2007
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> for size>=4, I get a latency of about 30 microseconds as expected, however for > size<4, communication costs increase massively, and latency now appears to be > 1ms! my guess would be some form of interrupt/message coalescing. > Secondly, can anyone suggest what's going on, or where I can go for more > information. what are your nics? have you looked at driver-level settings (ethtool, I guess)?
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