Distributed testing is a sort of testing which utilizes different systems to perform Stress Testing. Distributed testing in JMeter is applied to testing sites and server applications when they are working with different customers simultaneously. It typically includes running a similar test plan on all the machines.
Suppose, if you have an e-commerce website, it’s normal that you would expect a larger amount of activity on certain days such as Black Friday, for instance. At moments like these, we have to take our load tests to the next level and simulate larger numbers of simultaneous clients.
In the case, we are running our load tests locally with Apache JMeter™, there are sure drawbacks to the number of clients you can run, and regardless of whether your PC has enough CPU and memory.
How can we make a scenario with more than 800 simultaneous clients utilizing JMeter? One of the appropriate solutions is running distributed testing in JMeter. For those of you who have never heard about it, here is a short clarification.
When we discuss distributed testing in JMeter, we refer to a Master-Slave engineering where JMeter utilizes Java Remote Method Invocation to connect with objects in a distributed network.
Distributed load testing empowers having a local JMeter as a master that handles the test execution, together with different remote JMeter occurrences as slaves that will send the request to our target server.
For what reason do we require JMeter distributed testing?
What will you do if you have to reproduce an extensive number of clients in JMeter? Utilizing a single machine isn’t handy in such scenarios since one machine won’t have the computing power required to process all the requests. For this situation, you need to distribute the tests on an alternate machine to share the load. This is what happens in distributed testing in JMeter.
Distributed Load Testing in JMeter
For distributed load testing using JMeter, we have to make Master-slave setup wherein Master will control every one of the slaves and gather the test outcomes.
To make the system work firewall should be turned off and all the systems should be on the same subnet. Moreover, ideally, all the systems need to utilize a similar version of JMeter and Java.
Step 1: Before anything else, we have to begin the jmeter-server.bat in the slave system. For this simply go to the bin folder inside the JMeter home directory and run the batch file jmeter-server.bat in case of windows or jmeter-server in case of Linux.
Step 2: Presently on the master system open the properties record jmeter.properties and edit the remote_hosts section. Evacuate the loopback address value like 127.0.0.1 for the remote_host passage and determine the IP locations of all the slave systems isolated by commas.
Step 3: We simply need to Remote begin all the slave machines remotely in JMeter. For this simply open JMeter on the Master machine. Open your test script and remote begin all the nodes.
Test outcomes rely upon the following process:
- Master and slave systems configuration including processor speed and memory
- Network bandwidth
- The configuration of the JMeter load testing tool like number of users running in parallel
Drawbacks of Distributed Testing using JMeter Tool:
- The server whose execution is being load tested can be overloaded effectively if you make such a large number of requests through distributed JMeter performance testing.
- A slave machine can keep running up to 600 threads relying upon its computing assets and the complication of the test.
Apache JMeter testing tool is an open source utilized for load testing, functional testing, and performance testing. In JMeter, Master-Slave design is utilized for accomplishing load testing. Distributed performance testing using JMeter is a bit tricky and can give incorrect outcomes if not appropriately arranged.
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