Author: Vincent Diepeveen
Date: 05:17:43 03/27/01
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On March 26, 2001 at 22:44:53, Robert Hyatt wrote: >On March 26, 2001 at 20:54:48, Dan Andersson wrote: > >>I have to agree that multibanked memory and lage cashe size are very beneficial. >>Those factors could very well explain the superlinearity. >> >>Regards Dan Andersson > > >I don't think the 4-way interleaving helps. That _barely_ lets the machine >hold its own, memory-wise, because there are 4x as many cpus fighting over >access to memory... making it nearly 4x faster just barely breaks even. The >larger L2 cache may well make a difference, of course... You speak for Crafty. I speak for DIEP. I'm doing 8 probes of at least 16 bytes an entry. that's 128 bytes. I also do that to get a possible evaluation out of hashtable as i store evaluations in hashtable. So i do way more of those octo-probes as most progs try the hashtable... Further my whole program is made out of 'int'. So that means in short that all kind of tables are 4 times bigger (in bytes) as they could be. That means that when compared to some years ago i need quite some accesses to main memory. Both the bigger L2 cache and the faster memory helps a lot then. Best Regards, Vincent
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