Re: [Boost-Users] Re: multi_array performance

From: Beman Dawes (bdawes_at_[hidden])
Date: 2003-07-02 10:53:20

At 09:08 AM 7/2/2003, Marco Segurini wrote:
 >"Darren Cook" <darren_at_[hidden]> ha scritto nel messaggio
 >news:3F028EC9.8020208_at_dcook.org...
 >> > ... the output (using vc++ in release mode with no optimization) is
 >> >
 >> > Multi_array: 1663
 >> > Pointer....:70
 >>
 >> I've nothing helpful to say about multi_array, but how do the timings
 >> compare when you use the maximum speed optimizations? Much STL/Boost 
code
 >is
 >> written on the assumption that lots of things will be optimized away.
 >>
 >> Darren
 >>
 >
 >I make a test setting vc++ 7.1 with "Maximize Speed /O2" optimization 
with
 >these results:
 >
 > Multi_array: 471
 > Pointer....:0
 >
 >so the difference persists.

That seems beyond what might be expected from an abstraction penalty. Have 
you looked at the code being generated to see where the added time is 
coming from?

--Beman