Author: Robert Hyatt
Date: 06:36:54 03/27/01
Go up one level in this thread
On March 27, 2001 at 08:52:15, Andrew Dados wrote: >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- > This is correct. Threads share one address space so this isn't such a huge problem... > >> >>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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