18.337 WebMeeting

Message from: Steven G. Johnson (stevenj@MIT.EDU)
About: IMPORTANT REMINDER: Timing Change

Thu, 24 Apr 97 01:43:02 EDT

  • Next message: Jeff Chuang: "Tools directory for MPI on Xolas"
    Friends, Romans, and Countrymen,

    Please change the timing in your program to use gethrtime() (or the Cilk equivalent,
    if you are using Cilk) as described in the "Rules Clarification: Timing" message
    above. (Don't worry...this change should only take a few seconds to make.)

    gethrtime() works and it does what we want, and I think we should all measure
    time in the same way if we are to compare our results.

    Remember NOT to divide the time by the number of processors when you use
    gethrtime() (otherwise, your Mflops will be worse if you use more processors!).

    See you all today in class!

    It will be interesting to see what people have come up with. Don't worry if you
    think your program is slow; this is all for fun, anyway. (I know my program is not
    nearly as fast as I would like it to be; I haven't had time to explore some of the more
    interesting algorithms.)

    Cordially,
    Steven G. Johnson
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