RE: [boost] [function] timing trivia

From: Matthew Hurd (matt_at_[hidden])
Date: 2004-02-11 23:33:53

> On Behalf Of Douglas Paul Gregor
> Subject: Re: [boost] [function] timing trivia
> 
> On Thu, 12 Feb 2004, Matthew Hurd wrote:
> > Just completed some timings of the cost of a boost function call using a
> > boost::function<void (void)> and a raw function pointer versus inlining
> the
> > function's code directly into the source.
> >
> > For my circumstances (your mileage may vary):
> > 	Calling via raw function pointer = 314  microseconds +/- 1
> > 	Calling via boost function variable = 328 microseconds +/- 1
> >
> > Only 14 microseconds of difference.  Nice work, I was expecting much
> more.
> > Note:  Optimised VC7.1 output, winXP 1a, Athlon 2800+ (2.09GHz)
> 
> Looks like VC 7.1 is doing a good job optimizing this. I get asked about
> the performance of function<> every once in a while; mind if I stick this
> data in the FAQ?

Please do.  Please consider anything I post public domain unless it is
obviously embarrassing ;-)

Regards,

Matt Hurd.