Author: martin fierz
Date: 14:44:26 09/03/02
Go up one level in this thread
On September 03, 2002 at 16:26:33, Robert Hyatt wrote: >On September 03, 2002 at 15:50:45, Matthew Hull wrote: > >>On September 03, 2002 at 15:42:08, Gian-Carlo Pascutto wrote: >> >>>http://sjeng.sourceforge.net/ftp/hyatt1.png >>> >>>I will try to upload the full article as soon as I can. >>> >>>-- >>>GCP >> >>You've got to be kidding. When Vincent posts the numbers, he's got all these >>trailing zeros. What's with that? >> >>It is Vincent that's faking numbers here, not Bob. Bob's numbers are just >>rounded off. >> >>Vincent is the one emitting bogons here. > > >If you didn't see my response elsewhere, this output was produced by a program >I wrote to "eat" Cray Blitz log files. I did this for my dissertation as I >produced tens of thousands of test position logs for that. > >I believe that it does something similar to what I do today, which means that >anything between 1.71 and 1.8 is treated as 1.8, 1.81 to 1.9 is 1.9. that sure sounds like a bad thing to do! you should retain 2 digits, since the interesting number is not the speedup (1.8, 1.9, whatever), but rather the difference to 2. so if you measure 1.91 or 1.99, you really measure 0.09 or 0.01, and obviously these two numbers are quite different. also, if you really feel like rounding, you should do it in the normal sense, like 1.750 - 1.849 -> 1.8. i don't believe a word of vincent's post, but always rounding upwards is definitely making your data look better than it is, and should be rejected by any reviewer or thesis advisor - if he knew you were doing that :-). not that it makes a big difference of course - but for the 2-processor case we are talking about a potential >10% error, which where it starts getting significant. aloha martin > I am >not _certain_ as I don't have any of the old files left, they were all lost >somewhere around 96-97. And I might be wrong. But something tells me that >all this was integer values in Cray Blitz's logs, which means that it would >be convenient to compute speedup = something + roundup and truncate it as it >was all done in integers. > >however, I won't bet my life that I did that as the "log eater" was written in >1987 while working on my dissertation. that is a _long_ time ago to remember >some tiny detail inside the thing...
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