Comments on: Calling Java from MATLAB, Memory Issues

By: Joseph Fitzgerald

Joseph Fitzgerald — Wed, 08 Feb 2012 23:06:17 +0000

When I call a Java method from Matlab, is the memory copied to the Java heap? And then when I return data from Java to Matlab is that data copied to the Matlab heap? If so, is this a big performance concern that I should try to optimize (reduce the passing of data between heaps)? Thanks!

By: Yair Altman

Yair Altman — Sun, 07 Aug 2011 19:23:04 +0000

@Irad – you can activate Java’s garbage collector programmatically by calling: java.lang.System.gc

Of course, this does not really solve true memory problems. You actually need to do the much harder work of identifying your memory leaks and solving them. System.gc is merely a temporary band-aid.

By: Irad

Irad — Tue, 02 Aug 2011 10:58:44 +0000

I have a similar problem with a GUI I’ve written, and the matlab garbage collector is not efficient enough, but when I use the “Perform GC” on the JMC I get a very good collection.
the GUI is intended for end users.

is there a way to improve the collection without installing a java heap monitoring tool?

By: Shirley Zheng

Shirley Zheng — Fri, 15 Apr 2011 15:41:25 +0000

Mike:

It’s a good articles. But I have a different question to ask:

I called a java class in my .m file 350 times, it works perfect. then I put all the java class and libraries in two jar file, one has java libraries, the other one has java classes. Now the program works ok, but I wonder if there will be any special requirement when I compile the m file into executables?

Thanks

Shirley

By: Mike

Mike — Wed, 07 Jul 2010 15:02:07 +0000

@enkh, I'm not sure what you're asking. For C code to be useful it has to be compiled and linked (hence the dll). You can create a C MEX function, compile that and use it from MATLAB, if that's what you're asking?

By: enkh

enkh — Tue, 06 Jul 2010 17:48:34 +0000

Hi Mike,

Can i call C function instead of C dll from Matlab?

By: Mike

Mike — Fri, 11 Jun 2010 14:56:03 +0000

@Jason,

I made this graph with a Java profiling program called JProfiler on top of a debug build of MATLAB.

By: Jason

Jason — Wed, 09 Jun 2010 17:35:57 +0000

Hi Michael,

Thank you for the nice article, very informative. I am wondering what tool you were using to monitor the memory usage and produce the animated graph?

Best,
Jason