Author: Hristo
Date: 18:21:26 02/09/02
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On February 09, 2002 at 20:51:27, Will Singleton wrote: >On February 09, 2002 at 05:02:58, Hristo wrote: > >>Here is a report from the field. >>Exactly one week ago I bought a Mac. My very first Mac. >>A dual 1GHz G4 + 1GRam and all the other normal stuff. >>I’m absolutely impressed!!! After the initial shock of everything being new and >>different I must admit that this is the easiest “thing” to use, administer, >>configure and it is by far the prettiest interface and hardware out there. I >>still have the AMD and Intel boxez (indeed) but they have not seen much use >>lately. The only drawback, which to me is significant, is that linux+XWindows >>doesn’t run on this Mac (yet). The video card ... again, other than that >>Yellowdog linux boots just fine. >> >>The interesting thing is that the G4-1GHz outperforms the PIII-1GHz, P4-1.8GHz >>and Xeon 1.7GHz. My test was an FFT routine (class) I use at work. The code is >>not optimized in any shape or form for the G4. The worst case is when doing >>64K-samples FFT (using floats). >> >>G4 - 18 fft/sec >>Xeon 1.7 - 6.04 fft/sec >>P4 1.8 - 5.93 fft/sec >>pIII 1 - 5 fft/sec >> >>Yes ... the cache got the best out of the Intel Chipsen. ;-) >>Until this point the G4 was still better than the rest of them. All of the CPUs >>scaled “n log(n)” in the range of 1K-...-32K samples. >> >>If interested I can send you the source code to test yourself. >> >>It, almost, seems that one can write a chess program using “float” instead of >>“int” and still get the same performance. >> >>BTW >>Does anyone have test(s) you would like to try on a G4?! If reasonable I might >>do it. >> >>Regards. >>hristo > >Your email address seems invalid. Here's my message: > >Interesting fp test. I'd be interested to see how my program runs on your >machine. Would you mind running it? (If you're using os x, mine won't work. >You would need to run it in classic mode.) > I would love to try your program. No problem with the classic mode. The chess program that comes with OSX is buggy as hell and weak at the same time. :-) >As far as using floats to get a speed-up, I'm not sure how to go about that. If >I just declared certain often-used vars as floats, it might show something. But >most of my ints do a lot of bit-wise operations, so floats wouldn't work there. > The move generation might be better off with int. Other, as supposed to shifts, math can be used for some of the evaluation, I guess. I have an idea, but it would be a long post ... ;-/ >Any suggestions? Let me know if you want to run my prog, and I'll email the >executable. > Please send it to the address donquixote@pacbell.net hristo >Will
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