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Performance, Load, and Stress Testing - Comparison Chart:

Performance testing Load Testing Stress Testing
Superset of load and stress testing. A subset of performance testing. A subset of performance testing.
Helps to set the benchmark and standards for the application. To recognize the upper limit of the system, set SLA of the app and check how the system can handle a heavy load. To check out how the system behaves under extreme loads and how it recovers from failure.
The aim of performance testing is to get an indication of how an application behaves under regular parameters. Generating increased load on a web application is the main aim of load testing. Stress testing aims to ensure that under a sudden high load for a considerable duration the servers don't crash.
Resource usage, availability, and reliability of the product are validated under this testing. The attributes which are checked in a load test are peak performance, server quantity and response time. This kind of testing checks stability response time, etc.
In performance testing, Load limit is both below and above the threshold of a break. In load testing load limit is a threshold of a break. In stress testing load limit is above the threshold of a break.

Example of performance testing are:
  • Checking concurrent users, HTTP connections or checking Suitable response time.

Example of Load testing are:
  • Test of a word processor by make change in the large volume of data, test a printer by transferring heavy data.
  • Check mail server with thousands of concurrent users.

Example of Stress testing is:
  • Casually shut down and restart ports of a large network.

Why Performance Testing?
  • Validating that application performs properly
  • Validating to conform the performance needs of the business
  • Finding, analyzing and, fixing performance issues
  • Validating the hardware adequate to handle the expected load.
  • Doing capacity planning for future demand of the application

Why Load Testing?
  • Find bugs which are not possible with any other testing method. Such as memory management memory leaks, bugs, buffer overflows, etc.
  • To assure that application able to achieve the performance point recognized during performance testing.
  • To determine the operating capacity of an application
  • To check out that current infrastructure is sufficient to run the application or not.
  • Numbers of concurrent users which an application can support, and scalability to allow more users to access it.

Why Stress Testing?
  • It helps the testing unit to test the system in the situation of failures.
  • To make sure that the system has saved the data before crashing or not.
  • To check whether any unexpected failures do not harm the system security.
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Topic revision: r1 - 21 Apr 2020, KellyEverlyHall
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