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Re: Critical memory leak with J/Link

• To: mathgroup at smc.vnet.net
• Subject: [mg47558] Re: [mg47530] Critical memory leak with J/Link
• From: "Werner Schuster" <werner.schuster at netway.at>
• Date: Fri, 16 Apr 2004 05:20:23 -0400 (EDT)
• References: <200404150739.DAA11638@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

> Memory is not freed with calls to JavaGC[].  It is only freed with
> QuitJava[] or quitting the kernel.

You might want to refer to the "Reference Counts and Memory Management"
section of the J/Link Userguide;

JavaGC[] won't be of much help, if there is still a valid reference
to the Object; in your case, the "g" expression still points to the
MemoryHolder, which in turn still references the large Graph Expression
that you passed in. This is, as far as I see it, correct behaviour
 (Mathematica or J/Link doesn't know that you don't intend to use
the "g" expression/reference anymore, so it keeps it).

You can use either JavaBlock[] (wrap your code inside it) or one
of the Release* Expressions (ReleaseObject[],...) to get rid of the
reference (possibly followed by a JavaGC[] to make sure the GC frees the
memory).

I suppose that should solve your problem (unless I'm missing
something else).


murphee
-- 
Werner Schuster (murphee)
Student of SoftwareEngineering and KnowledgeManagement
Maintainer of the OGO-JOGI Project @ http://ogo-jogi.sourceforge.net/
Blog @ http://jroller.com/page/murphee

• References:
  • Critical memory leak with J/Link
    • From: "J. McKenzie Alexander" <jalex@lse.ac.uk>