Memory Usage

You can dramatically improve application performance by reducing the amount of garbage collection performed during execution. The following practices can also increase performance:

• Increase the initial heap size from the 1 MByte default with:

  java -ms number . java -mx number .

  The default maximum heap size is 16 MBytes.

• Find areas where too much memory is being used with:

  java -verbosegc

• Take size into account when allocating arrays (for instance, if short is big enough, use it instead of int).

• Avoid allocating objects in loops (readLine() is a common example)