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If you receive an error message saying your modeling tool is out of memory, the application does not have enough memory to operate. You can change the amount of allocated memory directly in the error message dialog or by changing modeling tool properties.

Tip
titleMemory allocation concept

Memory allocation for the product is the same as Java heap size. To increase the amount of memory allocated for the product, simply increase the Java heap size.


Recommended amount of allocated memory

The amount of allocated memory (or Java heap size) should be set to less than the available physical RAM on your computer. To calculate the approximate amount of memory you should allocate, subtract the amount of memory taken by any other processes that will run concurrently with your modeling tool from the total amount of RAM in your computer. Otherwise your JVM process will likely swap, and that will slow down the application.

Warning
titleDo not allocate too much memory

If you increase the Java heap size too much, you will get an error message that the Java virtual machine cannot be created, and a modeling tool will not start.


The maximum theoretical heap limit for the 32-bit JVM is 4G. In practice, the limit can be much lower, due to various additional constraints such as available swap, kernel address space usage, memory fragmentation, and VM overhead.

  • On most 32-bit Windows systems the maximum heap size ranges from 1.4G to 1.6G.
  • On 32-bit Solaris kernels the address space is limited to 2G.
  • On 64-bit operating systems running the 32-bit VM, the max heap size can be higher, approaching 4G on many Solaris systems.
  • On 64-bit VMs, the maximum Java heap size is limited only by the amount of physical memory and swap space your system provides.

Changing the amount of allocated memory

You can set the amount of memory allocated for your modeling tool either in the Environment Options dialog or in the modeling tool properties file.


To change the amount of allocated memory in the Environment Options dialog


  1. In the main menu of your modeling tool, go to Options > Environment. The Environment Options dialog opens.
  2. Expand the General options group on the left side of the dialog, and select the Memory Settings category.
  3. In the option specification area on the right side of the dialog, change the value of the Maximum Heap Size or Thread Stack Size option.


To change the amount of allocated memory in the modeling tool properties file


  1. Go to <modeling tool installation directory>\bin and open the modeling tool properties file.
  2. In the JAVA_ARGS line, change the value of the -Xmx or -Xss property. For example, change the -Xmx800M to -Xmx1066M.

  3. Save and close the file.
  4. Restart your modeling tool.
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