Re: User concurrency thresholding: where do I look? - Mailing list pgsql-performance

On Fri, 2007-07-27 at 04:58 -0400, Alvaro Herrera wrote:
> Jignesh K. Shah wrote:
>
> > Top Wait time   seems to come from the following code path for
> > ProcArrayLock:
> >
> >             Lock Id            Mode           Count
> >       ProcArrayLock       Exclusive              21
> >
> >             Lock Id   Combined Time (ns)
> >       ProcArrayLock           5255937500
> >
> >             Lock Id   Combined Time (ns)
> >
> >
> >              postgres`LWLockAcquire+0x1f0
> >              postgres`CommitTransaction+0x104
>
> Yeah, ProcArrayLock is pretty contended.  I think it would be kinda neat
> if we could split it up in partitions.  This lock is quite particular
> though.

Maybe, if we did we should set the partitions according to numbers of
users, so lower numbers of users are all in one partition.

--
  Simon Riggs
  EnterpriseDB  http://www.enterprisedb.com