I am hitting my head agains wall - and witnessing strange behaviour, where after time most of load focuses only to one thread. I am not sure what is the cause of this, but so far we have seen different things before load has concentrated to one single thread.
After reading thread: http://www.gossamer-threads.com/lists/zope/dev/24230?page=last
I started to wonder whether that signalling behaviour is also a cause for our problems - since we are running Debina linux without NPTL (
Linux 2.4.26 #1 SMP Thu Apr 22 11:16:14 EEST 2004 i686 unknown ).
When zope is started, it nicely starts multiple threads and when tested with ab - each thread gets their share of the work. We saw in event log previously exceptions that were never caught - and thought if those were the source of the problem. Eventhough we added ugly try catch code around this problematic code - we still notice load concentration to this one thread.
I will try to go and look with gdb those no longer working threads - but would like to know if anyone could give any pointers on what to look for or what to check.
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