@Vaibhav : There are many free jmeter plugins available, i recommend you to use 'perfmon for jmeter' plugin.
you can download it from here : http://jmeter-plugins.org/wiki/PerfMon/
This is Very Good Detailed Tutorial by IBM on Rational Performance Tester.
Please Visit : http://www.ibm.com/developerworks/rational/library/07/1211_lee-tham1/
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