Author: Robert Hyatt
Date: 17:16:00 09/04/02
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On September 04, 2002 at 19:22:25, martin fierz wrote: >On September 04, 2002 at 18:20:49, Terry Ripple wrote: > >>This is hardly the place to try and discredit our fellow CCC members and you >>know who i'am refering to! This was very distasteful and uncalled for and >>shouldn't have been allowed to continue at all. >> >>I just wanted to give my opinion on this matter! >> >>Regards, >> Terry > >i disagree with you... bob's DTS paper has 2 major flaws with numbers: >1. numbers in a table are claimed to be measured, and they are not, and vincent >is absolutely right to point this out. > >2. bob's rounding of 1.81 to 1.9 and rounding the average of these rounded >results can result in an average speedup of 1.82 to be reported as 2.0. this is >ridiculous and any undergraduate student should not get away with something like >that. I don't follow that point. Each "speedup" is computed from two numbers, the N processor time divided into the one processor time. There is a roundoff/truncation issue there. I didn't say "I did round up". I said "it is possible that the log eater might have done that." But that only happened on a single speedup. There is no "second" roundup because each speedup is only computed once. So for normal math, the error is +/- .05. If I happened to have done it in integer math, then the error _could_ have been +/- .09. Unfortunately, without the code, I can't say which. I suspect it was pure floating point, using the %.1f type format, which means .05 is the actual error. But that is just my best guess. Not a statement of fact... > >in science (unlike religion), you are allowed (and supposed) to point out >mistakes even of prominent members of the community. bob hyatt is not the pope, >and if he makes mistakes, i will say so. there is no need to do it in vincent's >tone of course, but that is a different matter ;-) > >what should be totally clear is that even if the numbers are a bit flawed, it >does not invalidate the paper at all. but the numbers are flawed, and saying so >has NOTHING to do with "bashing". > >aloha > martin
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