On 07/22/2013 07:26 AM, "Jóhann B. Guðmundsson" wrote: > On 07/15/2013 05:57 PM, Russ Anderson wrote: >> 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 > > And you are currently running Fedora on those systems? <sigh> Yes. We want to run Fedora "full out" on these systems ... otherwise why would we be asking? P. > _______________________________________________ kernel mailing list kernel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/kernel
