The amount of heap memory allocated to the Java virtual machine can impact performance. If you specify minimum or maximum memory values that are either too low or too high (too high meaning more than the physical memory of the machine), you could experience excessive pagefile swapping.
Increasing the stack size for recursive workflows If you have workflows that are recursive in nature (that execute loops), you might see a StackOverflowError at execution time. Java does not handle the stack space for recursive type functions effectively. Therefore, for recursive workflows, you need to increase the stack size for the JVM. The JVM defaults to 512K. You might want to increase the stack size to 1M.
To increase the stack size, you can include the -Xss1M setting with the JAVA_OPTS in your start Tomcat script file.
JAVA_OPTS="-server -Xss1M -Xms512M -Xmx512M -XX:MaxPermSize=512m"