Heikki Linnakangas <heikki.linnakangas@enterprisedb.com> writes:
> A couple of weeks ago I wrote a little patch that's similar to
> LWLOCK_STATS, but it prints out % of wallclock time that is spent
> acquiring, releasing, or waiting for a lock. I find that more useful
> than the counters.
I would think that the measurement overhead required to obtain two
wall-clock values for every LWLock touch would be so high as to render
any results from this quite suspect.
regards, tom lane