Re: [boost] [gsoc] heap review

Subject: Re: [boost] [gsoc] heap review
From: Thomas Klimpel (Thomas.Klimpel_at_[hidden])
Date: 2011-05-12 13:20:41

Phil Endecott wrote:
> OK, but the issue is that I don't trust that you can accurately measure
> execution times of the order of microseconds.  The overhead of, for
> example, the system call to read the clock will be significant.  If you
> believe that you can accurately measure such short periods, you should
> justify your methodology.  Otherwise, repeat a few thousand times.

http://www.fftw.org/cycle.h

But I agree, measuring something on the order of 1 microsecond won't be reliable, even with this non-portable code. Not sure whether fftw uses this itself when measuring which algorithm to use for a specific setup at runtime.

Regards,
Thomas