Hi Jost,
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Having at last connected a PHP script to WebSphere MQ via the
php-java-bridge I've been benchmarking the connection with Apache "ab",
and while the results are good performance-wise, the following error is
intermittently logged:
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Exception in thread "JavaBridge" java.util.NoSuchElementException
at java.util.LinkedList.remove(LinkedList.java:644)
at java.util.LinkedList.removeFirst(LinkedList.java:134)
at
php.java.bridge.ThreadPool.getNextRunnable(ThreadPool.java:33)
at php.java.bridge.ThreadPool.access$100(ThreadPool.java:7)
at php.java.bridge.ThreadPool$Delegate.run(ThreadPool.java:20)
The error occurs only when I specify a concurrency level greater than 1
- in my current setup it is most evident when running 5 concurrent
clients, which is not that much load.
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From what I gather there may be a problem with thread synchronization in
the bridge; what do you think?
I'm still running php-java-bridge v.2.0.7 and plan to upgrade, but can't
see anything in the changelog that addresses a similar problem.
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On a side note, I observe decreasing throughput after running several
benchmarks with identical parameters: the slugginess goes away when I
restart the bridge ... do I need to explicitly invoke some "garbage
collection" method at script's end?
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Bye,
Massimo
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