Restrictions for J/Link-ed Programs?
- To: mathgroup at smc.vnet.net
- Subject: [mg100887] Restrictions for J/Link-ed Programs?
- From: Christian Staudt <christian.staudt at ira.uka.de>
- Date: Wed, 17 Jun 2009 04:38:04 -0400 (EDT)
Hi MathGroup, I would like to use Mathematica with J/Link as a frontend and plotting environment for a computing-intensive benchmark written in Java. Unfortunately, I ran into the following two (related?) problems: a) As soon as the memory footprint of the Java process reaches about 260 MB (on my Macbook) or about 320 MB (on my Linux machine), it grinds to a halt. Apparently, the memory footprint is not allowed to increase any further, so the garbage collector goes out of its way to free memory - but will eventually fail with a "GC overhead exceeded" exception. This happens only if the program is called with J/Link. Called from the command line, it runs normally since it is allowed to use more memory. I tried to pass e.g. "java -Xmx2000m ..." as an Argument to ReinstallJava[CommandLine->...], but Mathematica seems to ignore or override the -Xmx option. b) The benchmark uses the linear program solver Cplex, which needs to communicate with a license token server in order to work. Again, it runs just fine from the command line, but not with J/Link. The communication with the license server fails with a timeout. My guess is that Mathematica puts restrictions on the linked program for security reasons or similar - affecting memory usage (a) and network communication (b). I could not find information on this on the web. Is my guess correct? If yes, how can these restrictions be removed? If I cannot solve this I have to do a laborious workaround, calling the Java program via Run ... so quick help would be very much appreciated. Thank you! Greetings, Christian