Re: [Boost-users] accumulators: not copying doubles into the acc set

Subject: Re: [Boost-users] accumulators: not copying doubles into the acc set
From: Dave Abrahams (dave_at_[hidden])
Date: 2012-08-01 07:43:48

on Sat Jul 07 2012, "MM" <finjulhich-AT-gmail.com> wrote:

> Now I tried to find 2 comparables ways of calculating the mean on a large
> number of doubles and time them
>
> http://codepad.org/12Uw654j
>
> Is this a fair comparison?

Nope.  The version using Boost.Accumulators has to count the number of
samples, whereas the hand-coded version has the number of samples
encoded as a constant.  A fair comparison would use the "sum"
accumulator and then divide by 134217728u.

-- 
Dave Abrahams
BoostPro Computing                  Software Development        Training
http://www.boostpro.com             Clang/LLVM/EDG Compilers  C++  Boost