On Thursday 12 November 2009 9:08:35 pm Sean Hamilton wrote: > Greetings -hackers, > > I have two unrelated questions. > > First, what is the status of NUMA support in FreeBSD? Is > there a performance penalty on Nehalem-class systems, > compared with Linux, which advertises NUMA awareness? Google > seems to turn up very little on this subject.
Yes, there is a penalty. I have some very simplistic NUMA support in a p4 branch (//depot/user/jhb/numa/...) that just makes threads allocate memory close to the current CPU when requesting a free page. It's not very general purpose, but it can be useful if you pin all your tasks to specific packages. I haven't tested it with non-pinned workloads to see what effect it has. -- John Baldwin _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[email protected]"
