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From "Albert Strasheim" <>
Subject Blocking on UsageManager.waitForSpace again
Date Thu, 18 Jan 2007 00:26:16 GMT
Hello all

We're having a problem where our application is blocking on 
UsageManager.waitForSpace for no obvious reason. The symptoms are very 
similar to what was discussed in this thread:

We set up few sessions with producers and consumers that send two types of 
messages, with all message sizes in the low kB range. We're using 
non-persistent, non-durable topics to communicate.

The application runs fine for about 2 minutes and during this time 
MemoryPercentageUsed (checked with JConsole) remains below 10% the whole 
time until it suddenly goes up to 100 and the application stops. Our 
application isn't doing any different at the point this abrupt increase 
occurs. It produces and consumes the same messages as fast as the CPU allows 
the whole time until it blocks.

Running with the JDK 1.6.0 server VM without any extra arguments, according 
to JConsole, the maximum heap size is 517 MB. It seems like the hang occurs 
each time exactly when the used heap size goes over 200 MB. Running 
ith  -Xms384m -Xmx512m I see the used heap size go up to 300+ MB then come 
back to down to a little more than 200 MB and then when it reaches 260 MB, 
it hangs again.

Running the client VM, the hang happens when the used heap size goes over 
300 MB, each time.

I'm using Windows XP SP2 with a Core 2 Duo processor.

Any thoughts?


Albert Strasheim

P. S. JConsole doesn't report any deadlocks in ActiveMQ or our application, 
so it looks like it really is blocking on UsageManager.waitForSpace.

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