Wednesday, 15 February 2012

Tips to Optimize QTP Scripts to Yield Better Performance

Tips to Optimize QTP Scripts to Yield Better Performance

We use Automated-testing tools to optimize our manual testing processes. But in order to reap full benefits of any automated testing tool, we must know the complete ins and outs of the tool otherwise it would be a huge waste of money spent on automation. We have to learn the automation tool very thoroughly. We also need to learn the language of the automation tool to do coding more effectively and efficiently. I believe that a software testing tool is as good as the person who is actually using it.
I have been getting so many emails from my esteemed readers asking about HP QuickTest Professional tutorials, QTP tips and tricks etc. Some readers even complain that their QTP scripts are too slow to execute. This time I decided to write a post on how to use QTP more effectively which means how to make our QTP scripts perform better. In order words, this post will throw light on some points, which will optimize your QTP scripts.
Some of the QTP optimization tips can be:  
Tip – 1: You should not use hard coded wait statement until absolutely necessary. Instead of the wait statement, you should use either exist or synchronization (sync) statements. The wait statement waits for the number of seconds, which have been provided. For example using wait(5) will wait for 5 seconds even if the browser gets into a ready state even after 2 seconds which means a waste of 3 seconds. Imagine how much time would be wasted if you have say 10 wait statements per script and you are running a batch of 500 scripts. A better alternative is using sync or exist statements for example:

Never use the exist statement without a value as it will take the default object synchronization timeout value from QTP settings. You can navigate to these settings from File->Settings and then go to Run tab. So use Exist(0) instead of Exist(10). Moreover, I will suggest to set the global object synchronization timeout to 1 second. 
 Tip – 2: Use declared variables instead of using variables on the fly. In order to enforce this in your scripts, use Option Explicit statement which forces the variable declaration. Moreover, using declared variables, scripts perform a bit faster. Also if you are using Option Explicit, it has to be the very first line of the code otherwise you will get an error.
Tip – 3: Using QTP for a longer period of time has a direct impact on the performance. It has been observed that a lot of Random Access Memory(RAM) gets consumed by QTP if QTP is running scripts for prolonged time. QTP starts eating system memory(memory leak) and sooner or later it will get hanged and we will be required to kill the qtpro.exe process and restart QTP all over again. In such a case, I will suggest you is to use QTP on computers with particular good amount of RAM and equally good clock speed.
Tip – 4: Do not load all addins while opening QTP. Use only the addins, which are required. This directly impacts QTP performance.
Tip – 5: I have personally experienced that opening QTP through a vbs file is faster than loading QTP through the icon.

Which one is right ?