Execution time of the particular function

[suma]

Hi,
Is there any tool to find out the execution time of the particular function in qt.

Thanks.

[lgeyer]

You can use "QElapsedTimer":http://doc.qt.nokia.com/latest/qelapsedtimer.html or "Q_BENCHMARK":http://doc.qt.nokia.com/latest/qtest.html#QBENCHMARK of the "QtTest":http://doc.qt.nokia.com/latest/qtest.html module, which allows for measuring various performance metrics (Walltime, tick counter, Valgrind/Callgrind, Event Counter).

[suma]

Hi,
Thanks for fast reply.Im using Qt 4.4 but those classes are introduced in 4.7. Any other solution?

[lgeyer]

"QTime":http://doc.qt.nokia.com/latest/qtime.html#elapsed should do the trick too.

[suma]

This i have tried out. It ll be fine if i get any tool to do this work.

[andre]

What is your ultimate goal? Do you want to hunt for bottlenecks in your application, or are you actually interested in the time a function took at runtime when the application is on your user's machine? In the first case, I suggest you use a tool like valgrind instead. In the second case, QTime will do just fine. Just do something like this:

@
QTime timer;
timer.start()
myLongFunction();
int runtime = timer.elapsed(); //gets the runtime in ms
@

[suma]

Hi,
Thank u very much. I ll find more about that tool.