Question

java.lang.OutOfMemoryError: Java heap space in Eclipse using CPLEX

Asked by: nicoleheritage

I am getting a memory error while building an IP model with Eclipse. I am calling CPLEX solver.
The exception that I get is
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
      at ilog.cplex.CpxQExpr.<init>(CpxQExpr.java:36)
      at ilog.cplex.CpxQextractor.visitNegative(CpxQextractor.java:52)
      at ilog.cplex.CpxNegative.accept(CpxNegative.java:23)
      at ilog.cplex.CpxQextractor.visitLinkedExpr(CpxQextractor.java:80)
      at ilog.cplex.CpxLinkedExpr.accept(CpxLinkedExpr.java:46)
      at ilog.cplex.CpxRange.<init>(CpxRange.java:1334)
      at ilog.cplex.IloCplexModeler.addRange(IloCplexModeler.java:4043)
      at ilog.cplex.IloCplexModeler.addEq(IloCplexModeler.java:4173)
      at model.BalanceHindsightTimeBucketsv15.solveModel(BalanceHindsightTimeBucketsv15.java:322)
      at model.BalanceHindsightTimeBucketsv15.<init>(BalanceHindsightTimeBucketsv15.java:146)
      at test.DBTest.main(DBTest.java:31)

The line that I am getting the exception is in the code. This constraint is added successfully for almost half of the model, then it gives this error. When I run the model for shorter time horizon(i.e., smaller model) it works.

I tried increasing the JVM memory to 768MB that eclipse is using via eclipse.ini file. It didn't work. I found in many websites that JVM memory can be altered for a class with running
java -jar myJar.jar -Xmx768M. I tried running myJar.jar this way via command prompt, it gave some other error related to CPLEX.

So, my question is:

How do I increase the default heap size of eclipse or JVM for all the projects? 

//add x=y+z constraint	
cplex.addEq(chassis[index][t], cplex.sum(chassisImb[index][t],converted[index][t]),myLaneVector.get(index).getMyLane()+" at time "+ t+ " x=y+z constraint for that lane ");

                                  
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Asked On
2009-09-10 at 14:58:04ID24723058
Tags

Memory Error

,

increase heap space

,

eclipse

,

CPLEX

,

Java

Topics

Eclipse

,

Java Programming Language

Participating Experts
1
Points
500
Comments
6

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Answers

 

by: objectsPosted on 2009-09-10 at 15:03:27ID: 25304992

you need to increase the memory available too your application
in eclipse you can specify the option in the vm options of the run configuration

 

by: objectsPosted on 2009-09-10 at 15:04:09ID: 25304999

> How do I increase the default heap size of eclipse or JVM for all the projects?

you can specify default option in the java control panel, but probably not the best idea

 

by: nicoleheritagePosted on 2009-09-10 at 15:06:33ID: 25305015

Savant,

How do I

"in eclipse you can specify the option in the vm options of the run configuration"?

 

by: objectsPosted on 2009-09-10 at 15:35:22ID: 25305212

Goto Run menu and select Run Configurations
there you will find the settings used when running your application

 

by: nicoleheritagePosted on 2009-09-11 at 06:06:27ID: 25308946

I put -Xmx1024m in the VM arguments specifically for that run. It didn't give that error. Run successfully completed. Thanks, objects.

But, I still need a way to alter the setting that is not specific to a run.

Couldn't find this in JAVA control panel?
"you can specify default option in the java control panel, but probably not the best idea"

 

by: objectsPosted on 2009-09-11 at 15:18:23ID: 25313932

try setting the runtime parameters from the Java tab

20120131-EE-VQP-002

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