[ grinder-Bugs-3406177 ] Instrumented objects are not garbage collected

Bugs item #3406177, was opened at 2011-09-08 11:47
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Category: Core engine
Group: None
>Status: Open
>Resolution: Fixed
Priority: 5
Private: No
Submitted By: GaryM ()
Assigned to: Philip Aston (philipa)
Summary: Instrumented objects are not garbage collected

Initial Comment:
I'm created a new instrumented object every Grinder run and eventually running out of tenured heap space in my JVM on extended soak tests.

>From Phil:

Each instrumented object uses memory to bind the instrumentation to the appropriate Test - a reasonable requirement. Unfortunately, The Grinder does not tidy up this memory if an instrumented object is garbage collected, and so instrumenting an object and throwing it away is an effective memory leak. Further, it will maintain a strong reference to the target object, pinning it in memory too.

Each instrumentation point in an object uses a CopyOnWriteArrayList, and hence a RentrantLock. This can be seen in an allocation stack trace (attached).


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>Comment By: GaryM ()
Date: 2011-09-14 13:05

Message:
Confirmed fixed with a 5 hour test that was leaking RentrantLock objects
previously. I can see the GC collecting RentrantLocks now.

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Comment By: Philip Aston (philipa)
Date: 2011-09-09 15:05

Message:
Looks like this is actually a bug in a third party class.

Please can you try the patch I'll attach to this bug. Just add it to the
start of the CLASSPATH you use to start the agent process.

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