updated documentation for executing install_dependencis.sh on EC2

benchmarks/README.md

@@ -8,6 +8,20 @@ The benchmarks measure the performance of TorchServe on various models and bench
 
 The script is mainly intended to run on a Ubuntu EC2 instance.  For this reason, we have provided an `install_dependencies.sh` script to install everything needed to execute the benchmark on this environment.  All you need to do is run this file and clone the TorchServe repo.
 
+While installing JMeter through brew, the `install_depdendencies.sh` script asks for following command line input.  
+```bash
+Installing JMeter through Brew
++ yes ''
++ brew update
+==> Select the Linuxbrew installation directory
+- Enter your password to install to /home/linuxbrew/.linuxbrew (recommended)
+- Press Control-D to install to /home/ubuntu/.linuxbrew
+- Press Control-C to cancel installation
+[sudo] password for ubuntu: 
+```
+
+Here `Press Control-D to install to /home/ubuntu/.linuxbrew` as the `ubuntu` user on EC2 node has password-less sudo access.
+
 ### MacOS
 
 For mac, you should have python3 and java installed.  If you wish to run the default benchmarks featuring a docker-based instance of TorchServe, you will need to install docker as well.  Finally, you will need to install jmeter with plugins which can be accomplished by running `mac_install_dependencies.sh`.