Re: [boost] Cutting over to MPL - any suggestions on improvingperformance?

From: Beman Dawes (bdawes_at_[hidden])
Date: 2004-01-22 12:19:10

At 11:36 AM 1/22/2004, Phil Richards wrote:

 >On Tue, 20 Jan 2004 18:44:32 +0000, I wrote:
 >> On Sun, 18 Jan 2004 00:19:44 -0600, Aleksey Gurtovoy wrote: [with 
respect
 >> to my performance problems using the MPL]
 >>> Sounds like something is wrong. Let's figure it out.
 >[example program and results stripped]
 >
 >I've had a poke around with the example program and looked at the
 >implementation of fold.  Each of the fold statements in the example
 >adds about 0.5 seconds.  Very roughly,
 >0.1 seconds can be allocated to zip_view<vector2<V1, V2> >
 >and the same (actually a little over 0.1 seconds) to
 >  begin<Sequence>::type
 >  end<Sequence>::type
 >in the implementation of fold (parameters to aux::fold_impl).
 >
 >I'm going to try a non-general re-implementation of fold, and see what
 >happens, but, it won't be pretty even if it is more efficient.  And, of
 >course, it won't be general.

Given other timings which showed great differences between compilers, you 
might want to report the results for several compilers.

--Beman