Author: Robert Hyatt
Date: 06:20:23 05/23/98
Go up one level in this thread
On May 23, 1998 at 09:11:14, Ernst A. Heinz wrote: >On May 22, 1998 at 16:52:31, Robert Hyatt wrote: >> >>On May 22, 1998 at 15:12:19, Ernst A. Heinz wrote: >> >>>On May 22, 1998 at 13:19:04, Robert Hyatt wrote: >>> >>>Bob, >>> >>>Great WAC results -- my congratulations! >>> >>>>Note that the ALR machine is running approxmiately as fast as the 500mhz >>>>alpha machine we used in Paris, for comparison. On that machine we were >>>>hitting around 250K nodes per sec... on this machine roughly a little >>>>faster, but about 1/4 to 1/3 of the machine is "wasted" due to search >>>>overhead... So that the newer alpha machines would actually be a bit >>>>faster on one processor, and way faster with more than one... >>> >>>Sounds a bit strange to me if you look at the SPECint95 ratings of >>>a PPro 200 MHz = 8.7 (i.e., 4x PPro 200MHz = 4x 8.7 = 34.8) and a >>>500MHz Alpha-21164a = 15.0 ... >>> >>>Are you sure about comparing the speeds on the same positions? >>> >>>=Ernst= >> >>yes. We ran several tests comparing a single pentium pro/200 to the >>alpha/500 we used in Paris, and got 3.1X speedup on that machine. > >Hmh, for "Crafty 14.10" Kai Luebke's WWW pages mention the following >benchmark speeds: > >CPU MHz hash hashp nps n/M Tester >-------------- --- ---- ----- ------ --- ------ >Alpha 21164 500 96.0m 5.0m 187549 375 Michel van der List >Pentium II 300 48.0m 5.0m 122460 408 Michel van der List >Pentium II 233 48.0m 10.0m 111475 478 John Perry >Pentium Pro (233) 24.0m 5.0m 107949 --- Kai "AMD-Killer" Luebke >AMD K6 233 12.0m 5.0m 101103 434 Werner Muehlpfordt (1) >HP PA8000 160 12.0 640k 100485 628 Michael Kalisz >AMD K6 233 12.0m 5.0m 93735 402 Djordje Vidanovic >Pentium Pro 200 24.0m 10.0m 87143 --- Kai Lübke > >According to this list, "Crafty 14.10" runs roughly 2x faster on a >500MHz Alpha-21164a than on a 200MHz PPro which corresponds quite >well to the relative SPECint95 ratings of both CPUs ... > >=Ernst= it seems to depend on the machine. IE when Bruce ran crafty on his polywell, it didn't do nearly so well. But in the case of Crafty on the DEC 500mhz machine, it did fly right along... Jason had a benchmark he used (now in the bench command in crafty, which is much better test than the "a3" test used in the chart you gave above) that produced about 80K on the P6/200, and (finally) 250K on the alpha in Paris. When he left the USA, we were running roughly 2.5X faster on the alpha, but he played with the optimizer between rounds and reached 3.1X as the best optimizations he could find. You can find out what optimizations he used from jdeines@mindspring.com if you are interested... I believe the machine we used had a 1M L2 cache... not sure about the memory however... and as I mentioned... on the problem set of WAC, crafty is running about 2.2X faster than with one processor... in a game, it seems to be running about 3-3.2X faster when there is continuity from move to move to help move ordering... next chance I get, I'll run wac on a single alpha and compare/report the results... Bob BTW, several versions of Crafty have hit 299/300 on a P6/200 one processor, although most do 297.
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