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    SubjectRe: Minutes from Feb 21 LSE Call
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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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