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Hi
We are encountering a very strange behavior in iSeries response time and we are running out of possible causes to this phenomenon:
we developed a JAVA application that launches COBOL services on the iSeries, via a Socket. Everything seemed to run smoothly.
Then we've tried to test the overall performance of the application, therefore, we have used a test tool to simulate hundreds of simultaneous connections, and this is where the strange behavior is being noticed: at first everything seems to be alright, excellent response time from the service on the iSeries machine, the CPU was running at around 85-90%, then suddenly at a certain point, the response time from the service was more than 10 seconds, and after that point, the response time were very awkward, the same service gave very quick responses for some connection, and very slow responses for other connections. More strangely, we've noticed that when this behavior is occurring, the CPU utilization decreased to less that 50 or 40%... (meaning, while we are encountering performance issues, the iSeries CPU is resting!)
It is like the requests were not getting through to the service!
Is there any explanation to this?
Hardware fault? (memory, disk...)
Too much QZSDAOINIT open?
We have tried to identify any possible lock on the database, but nothing appeared to be faulty at this level neither.
Any help would be appreciated
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