Re: Beginning tuning

Phillip,

You'd have to give us a lot more information than this to help you.

machine specs ?
Postgresql version and jdbc version
postgresql configuration
are you using a db pool ?

Dave

On 6-Nov-07, at 9:09 AM, Phillip Mills wrote:

> I'm just getting started on the process of analyzing performance for
> a Java Enterprise application. (The main negative symptom at the
> moment is that it doesn't use more than three processors on an eight-
> processor system, regardless of load.)
>
> One of the first things I've noticed out of a number of thread dumps
> is that there's about an 80% chance that the stack points to I/O
> requests from PGStream.ReceiveChar(). I'm wondering about any hints
> or pointers that would help me understand whether that's expected
> behavior, or something that needs fixing, or just generally how to
> evaluate/improve JDBC performance.
>
> (Regarding the main problem, none of my threads are reported in a
> blocked state, leading to my focus on I/O.)