Author: Andrew Dados
Date: 05:52:15 03/27/01
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On March 27, 2001 at 08:17:43, Vincent Diepeveen wrote: >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. My guess is big difference for SMP DIEP is running separate processes instead of threads. 8 probes is just icing on that cake. For what I know windows (unix too) will load each process to its own address space, so they will fight for L3 cashe. Or am I totally wrong here? -Andrew- > >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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