From: Scott Carey <scott@richrelevance.com>
To: Dmitri Girski <mitek17@gmail.com>, "pgsql-performance@postgresql.org"
	<pgsql-performance@postgresql.org>
Date: Tue, 5 Jan 2010 14:32:12 -0800
Subject: Re: pg_connect takes 3.0 seconds
Thread-Topic: [PERFORM] pg_connect takes 3.0 seconds
Thread-Index: AcqNrLJATCjOPbXERRGU/CUCOXfaBwAqjpEl
Message-ID: <C768FDEC.1DDB4%scott@richrelevance.com>
In-Reply-To: <daed64561001041812s602a3098l686f630d6448835f@mail.gmail.com>
Accept-Language: en-US
Content-Language: en
acceptlanguage: en-US
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0

Delays that are almost exactly 3 seconds over a network are almost always
some sort of network configuration issue.

Inside a datacenter, mis-configured load balancers or routers can cause low
level network issues that result in intermittent network delays of exactly =
3
seconds (a loop in a routing network?).
DNS timeouts are often 3 seconds.

Not sure if any of the above is it, but this sounds like a network
configuration problem to me.

On 1/4/10 6:12 PM, "Dmitri Girski" <mitek17@gmail.com> wrote:

> Hi everybody,
>=20
> I am running a PostgreSQL server 8.3.5 with a pretty much standard config=
.
>=20
> The web application server which runs Apache 1.3/PHP2.9 =A0has an intermi=
ttent
> problem:
> pg_connect takes exactly 3.0 seconds. The usual connection time is 0.0045=
.
> The long request happens at approximate rate 1:100.
>=20
> I turned on logs on postgres server side, and there is nothing=A0suspicio=
us=A0for
> me there. When a connection request comes, it is being served without any
> delay.=A0
>=20
> Could anyone point me to the direction in which I should investigate this
> problem further?
> Thank you in advance!
>=20
>=20
> PS The hardware is: Dell=A0SC1435/4Gb/2x2.0GHz/Gentoo Linux.
> The database & web servers are in the 2 local subnets.=A0
>=20
>=20
> Dmitri.
>=20
>=20