Author: Robert Hyatt
Date: 10:11:59 06/02/00
Go up one level in this thread
On June 02, 2000 at 10:52:20, Pete Galati wrote: >On June 02, 2000 at 10:42:17, Robert Hyatt wrote: > >>On June 02, 2000 at 10:13:35, Albert Silver wrote: >> >>>On June 02, 2000 at 02:01:29, Robert Hyatt wrote: >>> >>>>On June 02, 2000 at 01:44:29, Pete Galati wrote: >>>> >>>>>On June 02, 2000 at 00:58:00, blass uri wrote: >>>>> >>>>>>On June 02, 2000 at 00:18:23, Pete Galati wrote: >>>>>> >>>>>>>On June 02, 2000 at 00:06:40, Rick Luce wrote: >>>>>>> >>>>>>>>Junior 6 is slated to participate in the Dortmund tournament in July. How well >>>>>>>>do you think it will do? My guess is that Junior will fare poorly against such >>>>>>>>a strong field and could easily finish last. >>>>>>>> >>>>>>>>By my calculation, Fritz performed at about 2590 level at the Dutch >>>>>>>>Championship, if you discount the two games which were essentially forfeit wins. >>>>>>>> If Junior performs at a similar level, it could be in trouble. The competition >>>>>>>>at Dortmund will be much stronger including the likes of Khalifman, Anand, >>>>>>>>Huebner, Leko etc. >>>>>>>> >>>>>>>>Also, has there been any indication that any of the GMs will refuse to play >>>>>>>>Junior? >>>>>>>> >>>>>>>>-Rick >>>>>>> >>>>>>>Do you have a link for a site with info about the tournament? Which Junior? >>>>>>>What hrdware will it run on. My unqualified opinion, not knowing any answers to >>>>>>>those questions anyhow, is that Junior will do better than Fritz did. Just a >>>>>>>gut feeling. >>>>>>> >>>>>>>Pete >>>>>> >>>>>>I remember that Junior will use 8 processors so it will use better hardware than >>>>>>the hardware of Fritz. >>>>>> >>>>>>Uri >>>>> >>>>>Thanks, yes, I found this at the Chessbase site; "in the Super-GM tournament it >>>>>will have an eight-processor system". So Junior should do very well. >>>>> >>>>>Pete >>>> >>>> >>>>Don't panic here. 8 cpus is not twice as fast as 4 cpus, in the world of SMP >>>>searching. >>> >>>Yes, meaning it most likely won't even get an extra ply as opposed to 4 cpus >>>unless they are also using newer and faster processors (like the new 700 Mhz >>>Xeons) for the occasion. All the same, the matchups are fascinating. It's hard >>>to say how well it will do but if Xie Jun's games are any indication, Junior may >>>still be in for some serious trouble. Barring some of the absurdities that took >>>place, like the operator mistakes, the book problems, etc... Xie Jun did very >>>well against it, and I expect that these players will most likely make mincemeat >>>of it. Among other things, I think that contrary to the Dutch championship, all >>>the players here will be well-prepared against Junior as no one will want to >>>become its first Super GM scalp. Still, Junior's resilience should help save it >>>from many difficult positions so I predict a TPR slightly over 2600. >>> >>> Albert Silver >> >> >>The new 700 xeons won't go 4-way. To date, the fastest 4-way boxes are based on >>the 550mhz xeons that are about a year old now. We have been waiting on faster >>4-way chips, but Intel has not delivered. > >If this accounted for a major share of their market, you know they'd deliver. > >>The 8-way boxes are huge kludges >>that even in their best cases don't go 2x faster, just because memory can't keep >>up. And then there is SMP search inefficiency. I ran on an 8-way box and was >>not impressed at all (I ran on a 16-way alpha and was impressed out of my mind, >>however. :) ) > >Are there no advantages to the 8cpu boxes in this situation? > >Pete They are faster, but not a lot faster. IE I ran a common benchmark, which is simply a compute-bound program that requires a good bit of memory bandwidth to run. On my quad, if you run one copy it runs in N seconds. If you run 2 copies, it takes 2N+M seconds where M is not really too big and represents a memory bottleneck. I lose about 7% per cpu doing this... On the 8-way box, this benchmark would nor run more than 6 times faster, while on my 4-way box, it runs about 3.8 times faster. The 8-way has a memory bottleneck. The 4-way interleaving in the 4-way and 8-way boxes is barely enough for a 4-way machine. 8-way finds memory accesses a real delaying problem.
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