Author: Djordje Vidanovic
Date: 21:15:59 10/24/03
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On October 24, 2003 at 20:35:24, Robert Hyatt wrote: >On October 24, 2003 at 15:45:31, Gian-Carlo Pascutto wrote: > >>On October 24, 2003 at 15:16:24, Omid David Tabibi wrote: >> >>>No threads?! How do you conduct parallel search then (if I may ask)? >> >>Multiprocessing + shared memory >> >>-- >>GCP > > >IE fork() + either mmap() or shmget()/shmat(). > >It has some drawbacks. Eugene's probe code is threaded. Not using >threads hurts there, as you don't get the LRU buffer management >efficiency in the egtb cache. It might help marginally on a NUMA box >to have separate copies of the code/read-only data on each processor's >local memory (Eugene doesn't think this is much of a factor however, >due to cache sizes on larger NUMA boxes). Deep Sjeng uses the ipcs command and ipcrm shm 'shmid'... for hash bigger than 32MB. Djordje
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