Re: [boost] [function] timing trivia

From: Douglas Paul Gregor (gregod_at_[hidden])
Date: 2004-02-11 23:16:20

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?

        Doug