Many differences are commonly found between the test and production systems after the proper validation of test system. A differently configured performance test environment will produce invalid results which can greatly mislead all the stakeholders and the application itself can fail in production. There can be a dozens of reasons why your test environment is not producing the required results and some of them are as follows:
- Load Injectors overloaded: Check the load injector machines resource utilization. Quite often load injector machines consume more processor and memory and are unable to simulate the required number of virtual users. Run a small and simple test first and check the system resources consumption on these before running the detailed test.
- Insufficient network bandwidth: Network bandwidth plays a vital role when you are conducting the performance test over the WAN. Test results can greatly differ on the basis of available bandwidth. So make sure that sufficient network bandwidth is available for starting the test. Moreover, you need two network interface cards (NICs) when web server and database server are on different layers, one NIC will be facing the clients and the other one will be used for database communication.
- Improper test data: Improper test data can also create various issues in performance testing. It’s highly possible that a variable is not parameterized and same value is being submitted to the database for every user, which can lead to low processor activity due to artificial locking.
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