Am 03.11.2012 16:20, schrieb Petr Praus:
Your CPUs are indeed pretty oldschool. FSB based, IIRC, not NUMA.
A process migration would be even more expensive there.
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?
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, I'm pretty sure that having more work_mem is a good thing (tm)
normally ;-)
--
Gunnar "Nick" Bluth
RHCE/SCLA
Mobil +49 172 8853339
Email: [email protected]
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In 1984 mainstream users were choosing VMS over UNIX. Ten years later
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