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  jni memory allocation problems  (Read 1352 times)
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Offline Gorgorath

Junior Duke




Java games rock!


« Posted 2006-05-31 07:54:03 »

i have serious memory allocation problems via JNI i communicate with a dll, that consumes over 1 GB of system memory( it's just the way how the dll works). This dll does various calculation on the data, which further increases the memory allocation( in the order of 1.2 gb) but i get a java out of memory error( native ).
Is there a way i can give JNI more memory?

tia

Paul
Offline Ken Russell

JGO Coder




Java games rock!


« Reply #1 - Posted 2006-05-31 16:11:47 »

You're probably running out of address space on a 32-bit machine. The only workarounds for this are either to decrease the Java heap size to give the C heap more room to grow or to use a 64-bit JVM on a 64-bit CPU and OS.
Offline rreyelts

Junior Duke




There is nothing Nu under the sun


« Reply #2 - Posted 2006-05-31 17:02:48 »

You can also set the address space for java.exe to be 3G instead of 2G.

I wrote about this in my blog at http://jroller.com/page/rreyelts/20040914

Basically, you won't be able to grow your Java heap over 1.3G or so, because it needs to allocate its heap contiguously, but you can use the extra 1G of address space for your native code - which is exactly the problem you're trying to solve here.

About me: http://jroller.com/page/rreyelts
Jace - Easier JNI: http://jace.reyelts.com/jace
Retroweaver - Compile on JDK1.5, and deploy on 1.4: http://retroweaver.sf.net.
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