Author: Slater Wold
Date: 16:13:21 08/05/03
Go up one level in this thread
On August 05, 2003 at 18:38:51, Robert Hyatt wrote: >On August 05, 2003 at 17:30:51, Matthew Hull wrote: > >>Does Crafty scale above 4 processors? For example, could crafty utilize all the >>CPUs on an IBM pSeries 690 7040-681T 32-way? >> >>http://www-132.ibm.com/content/home/store_IBMPublicUSA/en_US/eServer/pSeries/high_end/690.html >> >>MH > > >I didn't have time to look closely. But it is most likely a NUMA platform, >which means that Crafty as it exists now is not going to work well on it. NUMA >machines require careful attention to what is put where in memory, so that >often-used data is as close to the physical processor (in terms of access >latency) as possible. The current implementation of SMP in Crafty is based >on pure SMP, where memory is simply shared. > >If I ever have time to fiddle with a NUMA machine, I'll probably look at >fixing the major issue, which is to put split blocks close to each processor, >and when giving a specific processor a tree to search, using a split block that >is _close_ to it. I really don't think it is a NUMA machine. "Advanced symmetric multiprocessing (SMP) up to 32-way", is how the exactly describe it. And when you go to their 'Clusters' section, this machine isn't mentioned.
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