On the larger, cellular Itanium systems with multiple motherboards (rx6600 to Superdome) Oracle has done a lot of tuning with the HP-UX kernel calls to optimize for NUMA issues. Will be interesting to see what they bring to Linux. On Jul 17, 2012 9:01 PM, "Scott Marlowe" <scott.marl...@gmail.com> wrote:
> On Tue, Jul 17, 2012 at 7:52 PM, Greg Smith <g...@2ndquadrant.com> wrote: > > Newer Linux systems with lots of cores have a problem I've been running > into > > a lot more lately I wanted to share initial notes on. My "newer" means > > running the 2.6.32 kernel or later, since I mostly track "enterprise" > Linux > > distributions like RHEL6 and Debian Squeeze. The issue is around Linux's > > zone_reclaim feature. When it pops up, turning that feature off help a > lot. > > Details on what I understand of the problem are below, and as always > things > > may have changed already in even newer kernels. > > SNIP > > > Scott Marlowe has been griping about this on the mailing lists here for a > > while now, and it's increasingly trouble for systems I've been seeing > lately > > too. This is a well known problem with MySQL: > > > http://blog.jcole.us/2010/09/28/mysql-swap-insanity-and-the-numa-architecture/ > > Thanks for the link, I'll read up on it. I do have access to large > (24 to 40 core) NUMA machines so I might try some benchmarking on them > to see how they work. > > -- > Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) > To make changes to your subscription: > http://www.postgresql.org/mailpref/pgsql-performance >
