Messages in this thread | | | Subject | Re: Minutes from Feb 21 LSE Call | From | Andy Pfiffer <> | Date | 24 Feb 2003 10:36:55 -0800 |
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On Sat, 2003-02-22 at 15:28, Larry McVoy wrote: > On Sat, Feb 22, 2003 at 02:17:39PM -0800, William Lee Irwin III wrote: > > On Sat, Feb 22, 2003 at 05:06:27PM -0500, Mark Hahn wrote: > > > ccNUMA worst-case latencies are not much different from decent > > > cluster (message-passing) latencies. > > > > Not even close, by several orders of magnitude. > > Err, I think you're wrong. It's been a long time since I looked, but I'm > pretty sure myrinet had single digit microseconds. Yup, google rocks, > 7.6 usecs, user to user. Last I checked, Sequents worst case was around > there, right?
FYI: The Intel/DOE ASCI Red system (>1 TFLOPS) delivered user-to-user messaging of < 5us. With a tail wind, peak point-to-point data rates, delivered from a user-mode buffer into another user-mode buffer anywhere else on the system were just shy of 400 megabytes/second (actual rates could be affected by several factors -- obviously).
Andy
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