| From: | Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com> |
|---|---|
| To: | "Anand Kumar, Karthik" <Karthik(dot)AnandKumar(at)classmates(dot)com> |
| Cc: | pgsql-general <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: Sudden slow down and spike in system CPU causes max_connections to get exhausted |
| Date: | 2014-01-08 01:31:18 |
| Message-ID: | CAOR=d=1D2yUCi797OG1JqjwWyX8wCLH=6LnLr7pRKoJU=wzEXQ@mail.gmail.com |
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| Lists: | pgsql-general |
On Mon, Jan 6, 2014 at 6:06 PM, Anand Kumar, Karthik
<Karthik(dot)AnandKumar(at)classmates(dot)com> wrote:
> Hi,
>
> We run postgres 9.1.11, on Centos 6.3, and an ext2 filesystem
>
> Everything will run along okay, and every few hours, for about a couple of
> minutes, postgres will slow way down. A "select 1" query takes between 10
> and 15 seconds to run, and the box in general gets lethargic.
>
> This causes a pile up of connections at the DB, and we run out of
> max_connections.
>
> This is accompanied with a steep spike in system CPU and load avg. No spike
> in user CPU or in I/O.
As well as the previously mentioned huge pages thing, also look at vm
dirty ratio:
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