How to increase Heap Size in Jmeter

Quite often we are unable to perform Load/ Stress/ Performance tests on local machines due to lack of memory size.

A simple hack can help us resolve this. How to increase Heap Size in Jmeter?

1. Increase the heap size:

a) Navigate to JMeter installation directory. <Installation Directory>/bin
b) Locate and Open Jmeter.bat in Text Editor
c) Search for "if not defined HEAP ("
d) Replace existing function with below code:
if not defined HEAP (
    rem See the unix startup file for the rationale of the following parameters,
    rem including some tuning recommendations
   set HEAP=-Xms8192m -Xmx8192m
   set NEW=-XX:NewSize=8192m -XX:MaxNewSize=8192m

//Here the 8192m represents 8 GB of RAM to be allocated for test run
)

2. Now execute the .jmx file using Command Line

<InstallationDirectory>/bin> jmeter -n -t <loadTest.jmx>
How to increase Heap Size in Jmeter How to increase Heap Size in Jmeter Reviewed by Ishan Dev Shukl on May 22, 2019 Rating: 5

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