[Qt-creator] Perf parser

[Ulf Hermann]

> Is it possible to profile Creator using perf from within the same 
> Creator executable? I can profile other applications, but trying to 
> profile Creator I notice that perfparser remains 100% active when the 
> other instance window is already closed.

I've profiled Qt Creator with the Performance Analyzer before.

Profiling creator generates _a lot_ of data, though. If perfparser takes 
too long to process it, you could reduce the sampling frequency or the 
stack depth. If it still takes a long time with a very low sampling 
frequency (say, 10), then it's a bug in perfparser.

Also, make sure to use an optimized build of perfparser and the "parent" 
qtcreator. That makes a big difference for me at least.

Ulf