[Zope] Weird hangs on zope/plone.

Maciej Wisniowski maciej.wisniowski at coig.katowice.pl
Tue Oct 9 15:11:40 EDT 2007

> When i google it i find a post somewhere saying about increase the
> number of threads and the number of the pool, but nothing about this
> limitation! :(
What kind of limitation? Instead of raising number of threads on one
zope instance you should just use few Zope instances with smaller number
of threads. AFAIK it's more effective.

> I will test DeadlockDebugger, but the main problem is only happen in
> the morning (around 8:00am-10:00am.
So install deadlockdebugger and look at it's output between 8:00-10:00.
It may be safely used on production instances.

Also check if some external resources like LDAP are not restarted/backed
up or sth. like that at this time, or before (eg. there is a backup at
night that causes 'something' wrong for connections from your zope and
your users start working since 8:00 - thats when you see 'hangup').

Maciej Wisniowski

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