Postgresql locks up server - no response at all
noackjr at alumni.rice.edu
Wed Aug 4 14:19:25 PDT 2004
On 08/04/04 15:34, Jeremy Chadwick wrote:
> I've seen this with our SuperMicro SuperServer 5013C-T, running mysqld.
> Please note that the server is "heavily loaded" (note the quotes); usually
> a load of around 0.50 to 1.00 at all times, with mysqld being the top
> process. Server runs all latest -CURRENT builds.
> Many people over in freebsd-threads mentioned this problem, and recommended
> all sorts-of different workarounds. I tried every one available to me,
> except mucking with PREEMPTION (as I did not feel comfortable tinkering
> with a random .h file on the box; seemed to be a kernel-related thing,
> so I'd rather have just an "options" line for it -- I'm conditionally
The one you didn't try most likely was the culprit. Robert Watson
showed that PREEMPTION and threading don't play well together right now:
The thought is that PREEMPTION uncovers scheduler bugs, but nobody's
figured it out at the moment.
> Wed Aug 4 13:28:35 PDT 2004
> * -CURRENT box is still alive and well.
PREEMPTION was turned off on August 1st, so if you've updated since then
things should have stabilized a bit:
More information about the freebsd-current