Author: Gian-Carlo Pascutto
Date: 02:34:09 02/09/02
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On February 09, 2002 at 04:50:22, 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. Keep in mind the FPU of the P4 is horrible. Much slower than the Athlon. However, it's SSE2 module is very fast _and_ optimized for just the kind of thing you're testing. So, if possible, I'd be interesting to optimize your code for Pentium 4 (if only by recompiling with Intel C+autovectorization) and see what comes out. -- GCP
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