Eric Thibodeau wrote: > Mark, > > NUMA is an acronym meaning Non Uniform Memory Access. This is a > hardware constraint and is not a "performance" switch you turn on. Under > the Linux kernel there is an option that is meant to tell the kernel to > be conscious about that hardware fact and attempt to help it optimize > the way it maps the memory allocation to a task Vs the processor the > given task will be using (processor affinity, check out taskset (in > recent util-linux implementations, ie: 2.13+). > > In your specific case, you would have 4Gigs per CPU and would want to > make sure each task (assuming one per CPU) stays on the same CPU all the > time and would want to make sure each task fits within the "local" 4Gig. > > Here is a link that should help you out with that respect: > > http://www.nic.uoregon.edu/tau-wiki/Guide:Opteron_NUMA_Analysis >
For a more general (and detailed) discussion of NUMA, you might be able for find some computer architecture books at the library where you are a grad student. Might be a little *too* much info, though. This text book is a popular comp. architecture text book. you might even say it's the "gold standard" I'm pretty sure it discusses NUMA somewhere in between it's covers. http://www.amazon.com/Computer-Architecture-Quantitative-Approach-Kaufmann/dp/1558605967 Prentice Bisbal Linux Software Support Specialist/System Administrator School of Natural Sciences Institute for Advanced Study Princeton, NJ _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
