Default heap size in Java.

Default maximum heap space is 1/2 of physical memory of size upto 192 bytes and 1/4th of physical memory for size upto 1Gig. So for 1Gig machine maximum heap size is 256MB 2.maximum heap size will not be used until program creates enough object to fill initial heap space which will be much lesser but at-least 8 MB or 1/64th part of Physical memory upto 1GB.

For Servers, Java virtual machine default maximum heap space is 1G for 4GB of physical memory on a 32 bit JVM. for 64 bit JVM its 32G for a physical memory of 128GB.

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