Re: Max connections

Yes, I had, but apparently the values were not high enough to
accommodate that many connections.

I retuned the IPC kernel setting, and now it appears to be running fine.

Thanks.

From: Shoaib Mir [mailto:shoaibmir(at)gmail(dot)com]
Sent: Monday, August 10, 2009 11:51 PM
To: Benjamin Krajmalnik
Cc: pgsql-admin(at)postgresql(dot)org
Subject: Re: [ADMIN] Max connections

On Tue, Aug 11, 2009 at 3:42 PM, Benjamin Krajmalnik <kraj(at)illumen(dot)com>
wrote:

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.

Are there any other config setting which should be changed
together with max_connections to successfully start the postmaster?

Increasing max_connection will make PostgreSQL to request more System V
shared memory or semaphores than your operating system's default
configuration allow. Did you tune/tweak the kernel options for that?
Details for those options can be found at

http://www.postgresql.org/docs/8.3/static/kernel-resources.html#SYSVIPC

--
Shoaib Mir
http://shoaibmir.wordpress.com/