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)
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"
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
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!
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