Author: Robert Hyatt
Date: 11:06:43 10/14/02
Go up one level in this thread
On October 14, 2002 at 11:36:41, Vincent Diepeveen wrote: >On October 13, 2002 at 22:00:01, Robert Hyatt wrote: > >>On October 13, 2002 at 10:21:05, Gian-Carlo Pascutto wrote: >> >>>On October 13, 2002 at 10:05:38, Robert Hyatt wrote: >>> >>>>But not on an 8-way using the fusion chipset. the quads scale well due to 4->way memory interleaving. The 8-way still uses 4-way interleaving ahd produces >>>>a significant memory bottleneck... >>> >>>Want to bet that, when actualy efficiency is not a consideration, >>>I can design a parallel system that scales well _in NPS_ no matter >>>what memory bandwidth is available? >> >>I'll take that bet, so long as it is a _real_ parallel search using shared >>memory. >> >>Note that we are talking about a real chess program. Not some junk thing that >>just searches the same stuff everywhere... >> >>IE something comparable to Fritz. > >I do not see why fritz would not get that 3.5 MLN nodes a second >at 4 processors or a dual P4 2.8Ghz when optimized for it. Then why don't you read before you post? We are discussing the NPS change when going from a quad to an 8-way box. I pointed out that the 8-way box still uses the same 4-way memory interleaving as is used in the quad, so that the 8-way box is not going to scale as well. I have no idea what your comments mean in that context... We are talking about an 8-way 900mhz xeon box. Not a dual. Not a quad. Not a NUMA box. Just an 8-way xeon. > >If he simply has kicked out the stupid MMX stuff and replaced it >by less MMX stuff and decent P4 code (so no branches) he can get >3.5MLN at a dual 2.8 P4 with DDR ram and 533 bus. > >For sure is that his program fits within the caches... Who cares? We are not talking about P4 or duals or quads... Take a deep breath, read carefully, then rejoin the conversation when you are up to it... > >> >>> >>>I could start by not sharing the hashtables. >>> >>>You get the idea... >>> >> >> >>No I don't, because we are talking about _fritz_ here. A _real_ parallel search >>engine. Nobody in their right mind would do that unless forced to do so due to >>some oddball constraint having nothing to do with chess. >> >> >> >> >> >>>-- >>>GCP
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