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Michael NevinsSubject: JVM Heap error
Author: Michael Nevins
Date: 13 Sep 2010 11:26 AM
I have a nested array that pulls data from MySQL. At a certain depth it fails with a heap error. also how can I spped up my performance. Do I need to adjust certain MySQL settings. I attempted to adjust JVM setting but with no change.


Michael A. Nevins
Northrop Grumman
Electronic Systems

Ivan PedruzziSubject: JVM Heap error
Author: Ivan Pedruzzi
Date: 14 Sep 2010 10:31 AM

Hi Michael,

Could you share a use case that reproduce the problem?

The stack trace when the error occurs may be very valuable.

Hope this helps

Michael NevinsSubject: JVM Heap error
Author: Michael Nevins
Date: 15 Sep 2010 08:35 AM
I cannot provide examples because this is defense related work. What I can say is that we are building an xml file that in its final size is about 12 M. There are dozens of nested arrays of arrays of arrays. The processing seems to go from 1 minute to 1 hour as add one more depth level of array.

If I switch over to a 64 bit OS with 4 G more memory help. Is the bottle neck MySQL or Stylus Studio or CPU speed.

Can you tell me which paramters I might modify to improve performance.

Michael A. Nevins
Northrop Grumman
Electronic Systems

Ivan PedruzziSubject: JVM Heap error
Author: Ivan Pedruzzi
Date: 15 Sep 2010 11:00 PM

The output size is not a problem, but the query design can affect the performance.

Tuning the Java heap size has described in several posts may be a short term cure.

Java Settings in Stylus Studio

Java Tools Documentation (see -Xmsn and -Xmxn)

Without seeing the query there is little more we can do.

Hope this helps

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