On Mon, Jul 15, 2013 at 01:41:05PM -0400, Prarit Bhargava wrote: > On 07/15/2013 01:33 PM, "Jóhann B. Guðmundsson" wrote: > > On 07/15/2013 05:21 PM, Prarit Bhargava wrote: > >> I've done some testing across various systems (both "large" and "small"). > >> Increasing NR_CPUS seems to have a negligible effect. I see about a 1.1M > >> increase in memory usage when switching between 128 cpus and 5120 cpus. Since > >> most systems ship with 4G or more these days, I cannot see an issue with > >> consuming a small amount of memory like this. > >> > >> The current NR_CPUS in Fedora is 128 and the current NR_CPUS in RHEL7 is 5120. > >> I do not see any reason that those values have to be different anymore. > >> > >> Thoughts/concerns? > > > > I guess the question here is anyone aware of anyone running Fedora with 128 > > Yes - me. And I have HW that exceeds that number. > > > cpu's or for that matter 5120. > > Yes -- Russ, care to share some numbers? We have a 5120 cpu system: 128 blades, 2 sockets per blade, 10 cores per socket, 2 HyperThreads per core. That system has 8 TB memory. We have another with 4096 cpus: 128 blades, 2 sockets per blade, 8 cores per socket, 2 HyperThreads per core. That system has 16 TB memory. Many smaller ones in the 512-1024 cpu range. FWIW, RHEL6 is CONFIG_NR_CPUS=4096 Thanks, -- Russ Anderson, OS RAS/Partitioning Project Lead SGI - Silicon Graphics Inc rja@xxxxxxx _______________________________________________ kernel mailing list kernel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/kernel
