Re: Peformance Tuning Opterons/ Hard Disk Layout

teolupus(at)gmail(dot)com ("Bruno Almeida do Lago") wrote:
> Is there a real limit for max_connections? Here we've an Oracle server with
> up to 1200 simultaneous conections over it!
>
> "max_connections: exactly like previous versions, this needs to be set to
> the actual number of simultaneous connections you expect to need. High
> settings will require more shared memory (shared_buffers). As the
> per-connection overhead, both from PostgreSQL and the host OS, can be quite
> high, it's important to use connection pooling if you need to service a
> large number of users. For example, 150 active connections on a medium-end
> 32-bit Linux server will consume significant system resources, and 600 is
> about the limit."

Right now, I have an Opteron box with:
a) A load average of about 0.1, possibly less ;-), and
b) 570 concurrent connections.

Having so connections is something of a "fool's errand," as it really
is ludicrously unnecessary, but I wouldn't be too afraid of having
1000 connections on that box, as long as they're being used for
relatively small transactions.

You can, of course, kill performance on any not-outrageously-large
system if a few of those users are doing big queries...
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