History

Why performance tools came into picture????????

Manually also we can execute performance testings but we need huge resources.

There are many limitations to the manual performance testing.

• Expensive, requiring large amounts of both personnel and machinery.
• Complicated, especially co-ordinating and synchronising multiple testers
• Involves a high degree of organization, especially to record and analyse results meaningfully
• Repeatability of the manual tests is limited

See the following screen shot to understand how we will do performance test by manually.

So to overcome all the limitations of manual performance testing , The performance testing tools came into picture.

Instead of using many tester we can use single machine with that we can apply huge amount of load on the targetted applications.

For better understanding purpose see the following screenshot.

Now a days many tolls are available in the market among those few are commericial tools and few are open source tolls.

Those are

1. loadrunner
2. jmeter
3. vsts
4. neo load
5. web load
6. rational performance
7. silk performanace
8. Load ninja
9. stress stimulus
10. load impact
11. loadster

The following are the advantages of performance testing tools.

• Reduces personnel requirements by replacing human users with virtual users or Vusers. These Vusers emulate the behaviour of real users
• Because numerous Vusers can run on a single computer, the tool reduces the amount of hardware required for testing.
• Monitors the application performance online, enabling you to fine-tune your system during test execution.
• It automatically records the performance of the application during a test. You can choose from a wide variety of graphs and reports to view the performance data.
• Because the tests are fully automated, you can easily repeat them as often as you need.

Performance Testing_Introduction :

  Performance Testing is a Non-Functional testing performed to evaluate application performance under some load and stress condition. It is generally measures in terms of speed, scalability & stability for the user activity.

Speed: Determines whether the application responds quickly.

Scalability: Determines maximum load the software application can handle.

Stability: Determines if the application is stable under varying loads. There are different types of performance testing.

 Why LOAD RUNNER????? 

Introduction: One of the best automated performance tool. It uses ANSI C as the default programming language and other languages like JAVA & VB.

 Advantages:

1. It supports all types of protocols (HTTP, FTP and SMTP).

2. Easy to analyze the results and generating scripts. Load Runner was invented by Mercury, and acquired by Hewlett – Packard Organization.

Why JMeter???

JMeter is an software that can be used to execute performance testing, load testing and functional testing of your web applications. JMeter can also simulate a heavy load on a server by creating tons of virtual concurrent users to web server.

JMeter is an open source application. This means that you can download JMeter’s source code to analyze and modify it if you want.

Stefano Mazzocchi of the Apache Software Foundation first designed it. He is now a software engineer at Google. Nowadays, JMeter has become one of the most popular testing tools in the world, beside Selenium and Load Runner.