Author: Robert Hyatt
Date: 09:26:55 12/10/02
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On December 10, 2002 at 11:03:13, Vincent Diepeveen wrote: > >please read the data posting done here about crafty with mt=2 at a 3Ghz P4 >with SMT turned on. That is _one_ test run, on a _very_ small set of positions, with a version of Crafty that is _known_ to have a problem with spinlocks/spinwaits on an SMT machine. So what is your point? > >> >> >>>so is no good of a standard >>>here. Also it is doing 2 probes in 2 different hashtables which i cannot >>>do even in DIEP (too slow for me) i do 8 probes in 1 hashtable sequential >>>(so a good bandwidth is helping diep more than it is crafty for example). >>> >>>My own testing at the machines you mentionned, with exception of the >>>3.0Ghz P4, i found that for the newer generation P4s the speed >>>difference is only 1.5 for 133Mhz versus 133Mhz bus. >> >>What in the world does that mean??? > >Ah bad memory of you and not 100% clear sentence of me: No bad memory of me. You said "difference of only 1.5 for 133mhz vs 133mhz" so there is _no_ memory issue there. There _is_ a writing issue. _yours_. If I read correctly, 133 == 133, yet you say 133 is 1.5X faster than 133. And that is a "bad memory" on my part? Thought so... :) > >1 Ghz K7 = 1.7Ghz P4 (old core with 100Mhz quad pumped rdram versus 133Mhz > memory of k7) > >new core (ddr ram especially both 133Mhz now) > >1 Ghz K7 = 1.5ghz P4 but now you must see it as 1.6Ghz K7 == 2.4Ghz P4 >for DIEP that is. > >For WARP it was better than that. > > >No as you can see in the posted data, crafty had a 13-16% speedup at >a single cpu P4 at 3 Ghz with MT=2. On that one set of positions. I posted _other_ data as well... You need to stop quoting things as "absolute fact" when there is so much variability. Particularly things like "needs less nodes with mt=2" as that is total nonsense for the average case and only happens in unique cases. >>>>Vincent
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