HAST performance / dtrace / _umtx_op

[Karl Pielorz]

--On 26 April 2014 13:29:43 +0200 Jilles Tjoelker <jilles at stack.nl> wrote:

> _umtx_op implements blocking not only for mutexes but also for condition
> variables, and in the latter case waiting for a long time does not
> indicate a problem.

Thanks for the info - I'll keep looking around, though it's looking like 
the cause is not going to be anything obvious/simple (to me, anyway :-)

-Karl