[Qt-interest] how to computing costed time of a function?

[Thiago Macieira]

Em Quinta-feira 16 Julho 2009, às 11:28:54, Amit Pundir escreveu:
> On Thu, Jul 16, 2009 at 2:26 PM, Christopher Rasch-Olsen
>
> Raa<christopher at technophile.info> wrote:
> > You could use QTime for such measurement. Have a look at QTime::start().
> > QTime timer;
> > timer.start();
> > long_operation();
> > qDebug() << "Elapsed:" << timer.elapsed();
>
> Hi, is there any way to measure elapsed time in microseconds?

You need a high-resolution timer for that. You're going to need operating 
system help for that, in order to access some performance registers available 
in most modern CPUs.

So Qt doesn't offer any such thing. I recommend using valgrind (tool callgrind) 
and oprofile on Linux.

-- 
Thiago Macieira - thiago.macieira (AT) nokia.com
  Senior Product Manager - Nokia, Qt Software
     Sandakerveien 116, NO-0402 Oslo, Norway
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