Load test using JMeter

[#1]

Dear All,

Using Qvs 11 SR2 with IIS webserver, I am performing load test using JMeter on test server having 8 GB RAM.

Getting heap memory related error message which says :

Time Stamp: 25Thu10114109

Test Name: DestJMXs\Portal4test.jmx

Error occurred during initialization of VM

Too small initial heap for new size specified

errorlevel=1

Press any key to continue . . .

Even though I have modified the JVM heap setting in jmeter.bat file to

set HEAP=-Xms8192m -Xmx8192m

set NEW=-XX:NewSize=8192m -XX:MaxNewSize=8192m

Appreciate if someone suggest how to overcome heap memory issue.
How do we allocate appropriate heap memory?

Thanks in advance,

Kumar