Performance Testing : Why Performance Testing 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

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