Author: Robert Hyatt
Date: 17:32:06 01/20/01
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On January 20, 2001 at 16:12:25, Eugene Nalimov wrote: >On January 20, 2001 at 16:01:46, Robert Hyatt wrote: > >>On January 20, 2001 at 15:39:02, Joshua Lee wrote: >> >>>How fast is crafty on a 800Mhz PIII? AMD Athlon at 800Mhz? I don't know about >>>the Alpha too much which CPU speeds do they offer for comparison? Would a Dual >>>or Quad Xenon or Athlon compare with a Single Alpha ? Thanks >> >>Here is the output for running WAC at 60 seconds per move on a single xeon cpu, >>700mhz, 1M L2 cache: >>test results summary: >> >>total positions searched.......... 300 >>number right...................... 299 >>number wrong...................... 1 >>percentage right.................. 99 >>percentage wrong.................. 0 >>total nodes searched.............. 132559227.0 >>average search depth.............. 4.7 >>nodes per second.................. 412161 >> >> >> >>Here is the same test run on a 21264 alpha at 600mhz: >> >>test results summary: >> >>total positions searched.......... 300 >>number right...................... 300 >>number wrong...................... 0 >>percentage right.................. 100 >>percentage wrong.................. 0 >>total nodes searched.............. 236973211.0 >>average search depth.............. 4.5 >>nodes per second.................. 783641 >> >>As you can see, the alpha has a 16% slower clock speed, but is nearly 2x >>faster... >> >>Bob > >I believe that part of the explanation is the compiler. You are using obsolete >GNU compiler on the x86, but state-of-the-art compiler on Alpha. Good x86 C >compiler will give you at least additional 20%. > >Eugene That is definitely a part of it. However, I don't think the speed difference between the specific version of GCC that I use and MSVC 6 is 20%, although you might have access to more recent compilers that are better. But even with that 20% the alpha is way yonder faster than the X86 I ran on...
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