Re: User concurrency thresholding: where do I look?

"Jignesh K. Shah" <J.K.Shah@Sun.COM> writes:
> Yes I did see increase in context switches and CPU migrations at that
> point using mpstat.

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.

            regards, tom lane