Re: Max connections

From: "Benjamin Krajmalnik" <kraj(at)illumen(dot)com>
To: "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: <pgsql-admin(at)postgresql(dot)org>
Subject: Re: Max connections
Date: 2009-08-11 16:40:10
Message-ID: F4E6A2751A2823418A21D4A160B689883FCD91@fletch.stackdump.local
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Tom,

This exercise is exactly to help us size our production server, but I
appreciate what you are saying.
I am using pgbouncer, but my understanding is that I need to make as
many potential connections available on the server side as the maximum
pool size - I will shoot them an email to get some guidance.

As always, thank you so much for your assistance.

> -----Original Message-----
> From: Tom Lane [mailto:tgl(at)sss(dot)pgh(dot)pa(dot)us]
> Sent: Tuesday, August 11, 2009 7:54 AM
> To: Benjamin Krajmalnik
> Cc: pgsql-admin(at)postgresql(dot)org
> Subject: Re: [ADMIN] Max connections
>
> "Benjamin Krajmalnik" <kraj(at)illumen(dot)com> writes:
> > I am setting up a test environment to simulate a very high load. We
> > have a server farm which is receiving data (cold be thousands of
> > simultaneous users posting data). I currently have max_connections
> set
> > to 500 and the server is starting ok. If I try to increase the
> > max_connections to 1000, the server is unable to start. I am
running
> a
> > VM with 4GB RAM. Swap space is not being used, and the system is
> > showing about 1.5GB of ram not being utilized.
>
> Quite honestly, you're living in fantasy land if you expect to support
> 1000 concurrently active backends on such a restricted server. Get
> yourself a connection pooler and knock down max_connections to 100 or
> so.
>
> regards, tom lane

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