ib_read_lat question
Hey Ido,
ib_read_lat displays RTT latency, while the other lat programs display RTT/2. Is this intended? Or is read_lat.c/print_report() missing a divide-by-two?
Thanks,
Steve.
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Quoted 3 lines
ib_read_latdisplays RTT latency, while the other lat programs display RTT/2. Is this intended? Or is read_lat.c/print_report() missing a divide-by-two?
The tests should measure how long it takes the data to reach the destination. For writes/sends, that would be RTT/2. For reads, the destination is local, so you should want RTT. --
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Quoted 4 lines · Sean
Quoted 3 lines
ib_read_latdisplays RTT latency, while the other lat programs display RTT/2. Is this intended? Or is read_lat.c/print_report() missing a divide-by-two?The tests should measure how long it takes the data to reach the destination. For writes/sends, that would be RTT/2. For reads, the destination is local, so you should want RTT.
Guess that makes sense.
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Quoted 8 lines · Steve Wise
Quoted 4 lines · Sean
Quoted 3 lines
ib_read_latdisplays RTT latency, while the other lat programs display RTT/2. Is this intended? Or is read_lat.c/print_report() missing a divide-by-two?The tests should measure how long it takes the data to reach the destination. For writes/sends, that would be RTT/2. For reads, the destination is local, so you should want RTT.
Guess that makes sense.
Yes, to me too.
Thanks Sean
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