| From: | Rob <rclemley(at)yahoo(dot)com> |
|---|---|
| To: | Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com> |
| Cc: | pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: System overload / context switching / oom, 8.3 |
| Date: | 2010-02-02 21:44:36 |
| Message-ID: | 4B689CC4.8010406@yahoo.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-performance |
Scott Marlowe wrote:
> On Tue, Feb 2, 2010 at 12:11 PM, Rob <rclemley(at)yahoo(dot)com> wrote:
>
>> postgresql.conf:
>> max_connections = 1100
>> work_mem = 32MB
>>
>
> 32MB * 1000 = 32,000MB... And that's if you max out connections and
> they each only do 1 sort. If you're running many queries that run > 1
> sorts it'll happen a lot sooner.
>
> Either drop max connections or work_mem is what I'd do to start with.
> If you have one or two reporting apps that need it higher, then set it
> higher for just those connections / users
Thanks much. So does dropping work_mem to the default of 1MB sound good?
By moving databases around we're getting max_connections below 600 or 700.
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