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Starting eclipse with more memory for large projects

Introduction

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Srikanth Eswaran

Srikanth Eswaran has seen nearly three decades of lifestyle across three generations starting from India being the land of snake charmers to the country becoming the next infrastructural superpower. In this time, he has been through some demanding situations, trials and tribulations which has made him a polished and mature individual who is now poised to handle what life throws at him. His interests lie in writing, discussing online, photography, web-design, software project management and methodologies and automobiles to name a few.


eclipse, large, projects, java, memory

Starting eclipse with more memory for large projects

Posted by Srikanth Eswaran on .
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eclipse, large, projects, java, memory

Starting eclipse with more memory for large projects

Posted by Srikanth Eswaran on .

I had come across a situation where my Eclipse IDE used to crash or shutdown forcibly due to less memory being available. After searching around for a while, I came across a command that enables you to start this IDE with more memory. Here it is:

eclipse -vmargs -Xmx<memory size>

I have tried combinations of 512M and 1024M (0.5 GB and 1GB respectively) and the IDE worked fine without a crash since then. This is a useful command and I hope you can refer this site for starting up eclipse with more memory in future and avoid some precious time saving IDE crashes in future!

UPDATE: On this link, I also found six common errors one would make while starting up eclipse with virtual memory arguments. I reproduce here the excerpt of the six errors:

Two JVM options are often used to tune JVM heap size: -Xmx for maximum heap size, and -Xms for initial heap size. Here are some common mistakes I have seen when using them:

  • Missing m, M, g or G at the end (they are case insensitive). For example,

java -Xmx128 BigAppjava.lang.OutOfMemoryError: Java heap space

The correct command should be: java -Xmx128m BigApp. To be precise, -Xmx128 is a valid setting for very small apps, like HelloWorld. But in real life, I guess you really mean -Xmx128m

  • Extra space in JVM options, or incorrectly use =. For example,
    java -Xmx 128m BigAppInvalid maximum heap size: -XmxCould not create the Java virtual machine.
    java -Xmx=512m HelloWorldInvalid maximum heap size: -Xmx=512mCould not create the Java virtual machine.

The correct command should be java -Xmx128m BigApp, with no whitespace nor =. -X options are different than -Dkey=value system properties, where = is used.

  • Only setting -Xms JVM option and its value is greater than the default maximum heap size, which is 64m. The default minimum heap size seems to be 0. For example,

java -Xms128m BigAppError occurred during initialization of VMIncompatible initial and maximum heap sizes specified

The correct command should be java -Xms128m -Xmx128m BigApp. It’s a good idea to set the minimum and maximum heap size to the same value. In any case, don’t let the minimum heap size exceed the maximum heap size.

  • Heap size is larger than your computer’s physical memory. For example,

java -Xmx2g BigAppError occurred during initialization of VMCould not reserve enough space for object heapCould not create the Java virtual machine.

The fix is to make it lower than the physical memory: java -Xmx1g BigApp

  • Incorrectly use mb as the unit, where m or M should be used instead.

java -Xms256mb -Xmx256mb BigAppInvalid initial heap size: -Xms256mbCould not create the Java virtual machine.

The heap size is larger than JVM thinks you would ever need. For example, java -Xmx256g BigAppInvalid maximum heap size: -Xmx256gThe specified size exceeds the maximum representable size.Could not create the Java virtual machine. The fix is to lower it to a reasonable value: java -Xmx256m BigApp

  • The value is not expressed in whole number. For example,

java -Xmx0.9g BigAppInvalid maximum heap size: -Xmx0.9gCould not create the Java virtual machine.

The correct command should be java -Xmx928m BigApp

user

Srikanth Eswaran

http://srik.in

Srikanth Eswaran has seen nearly three decades of lifestyle across three generations starting from India being the land of snake charmers to the country becoming the next infrastructural superpower. In this time, he has been through some demanding situations, trials and tribulations which has made him a polished and mature individual who is now poised to handle what life throws at him. His interests lie in writing, discussing online, photography, web-design, software project management and methodologies and automobiles to name a few.