[Zope] Weird hangs on zope/plone.

[Brian Sullivan]

On 10/9/07, Maciej Wisniowski <maciej.wisniowski at coig.katowice.pl> wrote:
> > I set the number of threads:
> >     zserver-threads 25
> > I set:
> >     pool-size 27
> > on <zodb_db main>
> I think you should rather use ZEO than raise number of threads to such a
> big value. Also there are some rules about pool-size. I don't remember
> exactly but seems to me that it is too small, but
> in general I suppose it has nothing to do with your problem...
>
>
> Situation you're seeing may appear if there is something that blocks
> all your threads, like all threads are waiting for RDBMS response...
>
>
> > How can i run some kind of debug on zope (debug-mode on dont log
> > anything more) to check this next time happen?
> Use DeadlockDebugger and if this doesn't help try:
> http://www.zopelabs.com/cookbook/1073504990

DeadlockDebugger certainly helped me in a similar situation.

I went through similar blind flailing machinations - modifying threads
and pool sizes (in the end I found not a Zope or Plone coding problem
but some of my Javascript code was inadvertently occasionally causing
a tight looped remote access of a generated page --effectively a self
inflicted DOS attack!)