| From: | Shaun Thomas <sthomas(at)optionshouse(dot)com> |
|---|---|
| To: | Merlin Moncure <mmoncure(at)gmail(dot)com> |
| Cc: | Vlad <marchenko(at)gmail(dot)com>, Jeff Janes <jeff(dot)janes(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: High SYS CPU - need advise |
| Date: | 2012-11-20 16:12:42 |
| Message-ID: | 50ABABFA.9070509@optionshouse.com |
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| Thread: | |
| Lists: | pgsql-general |
On 11/20/2012 10:03 AM, Merlin Moncure wrote:
> Shared buffer manipulation changing contention is suggesting you're
> running into free list lock issues. How many active backends/cores?
Oh, the reason I wanted to point it out was that we see a lot more than
CPU contention with higher shared_buffer settings. The scheduler starts
aggressively clearing out the file cache *and* freeing memory, driving
load way higher than it should be. That doesn't result in a very high
iowait, but all that page swapping sure isn't free.
--
Shaun Thomas
OptionsHouse | 141 W. Jackson Blvd. | Suite 500 | Chicago IL, 60604
312-444-8534
sthomas(at)optionshouse(dot)com
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