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

"Jignesh K. Shah" <J.K.Shah@Sun.COM> writes:
> Tom Lane wrote:
>> So follow that up --- try to determine which lock is being contended
>> for.  There's some very crude code in the sources that you can enable
>> with -DLWLOCK_STATS, but probably DTrace would be a better tool.

> Using plockstat -A -s 5 -p $pid

I don't know what that is, but it doesn't appear to have anything to do
with Postgres LWLocks or spinlocks, which are the locks I was thinking of.
Try asking Robert Lor about this --- IIRC he had some dtrace probes to
work with our locks.

            regards, tom lane