Am 03.11.2012 16:20, schrieb Petr Praus:
Ok, I've actually looked these up now... at the time these were current, I was in the lucky situation to only deal with Opterons. And actually, with these CPUs it is pretty possible that Scott Marlowe's hint (check vm.zone_reclaim_mode) was pointing in the right direction. Did you check that?
Your CPUs are indeed pretty oldschool. FSB based, IIRC, not NUMA. A process migration would be even more expensive there.
I did check that, it's zero. I responded to his message, but my messages to the mailing list are getting delayed by ~24 hours because somebody has to always bless them.
Well, I'm pretty sure that having more work_mem is a good thing (tm) normally ;-)
Yes, same behaviour. I let the shared_buffers be the default (which is 8MB). With work_mem 1MB the query runs fast, with 96MB it runs slow (same times as before). It really seems that the culprit is work_mem.
Well, that's what I always thought too! :-)
-- Gunnar "Nick" Bluth RHCE/SCLA Mobil +49 172 8853339 Email: gunnar.bluth@xxxxxxxxxxx __________________________________________________________________________ In 1984 mainstream users were choosing VMS over UNIX. Ten years later they are choosing Windows over UNIX. What part of that message aren't you getting? - Tom Payne
