Re: Deterioration in performance when query executed in multi threads

On Wed, May 01, 2013 at 02:05:06PM +0000, Anne Rosset wrote:
> Hi all,
> We are running a stress test that executes one select query with multiple threads.
> The query executes very fast (10ms). It returns 100 rows.  I see deterioration in the performance when we have
multiplethreads executing the query. With 100 threads, the query takes between 3s and 8s. 
>
> I suppose there is a way to tune our database. What are the parameters I should look into? (shared_buffer?,
wal_buffer?)
>
> Thanks for your help,
> Anne

Try a connection pooler like pgbouncer to keep the number of simultaneous queries
bounded to a reasonable number. You will actually get better performance.

Regards,
Ken