Re: [boost] Re: shifted_ptr<> w/ lock mechanism

From: David Abrahams (dave_at_[hidden])
Date: 2003-01-30 13:11:04

"Peter Dimov" <pdimov_at_[hidden]> writes:

>
> You might need to use a lower n. Here's what I get (randomly choosing
> g++/mingw):
>
> GNU C++ version 2.95.3-6 (mingw special)
> Win32
> SGI standard library
> BOOST_HAS_THREADS: (not defined)
> BOOST_SP_USE_STD_ALLOCATOR: (not defined)
> BOOST_SP_USE_QUICK_ALLOCATOR: (not defined)
> 1048576 shared_ptr<int> allocations + deallocations:
>    1.582 seconds.
>    1.713 seconds.
>    1.702 seconds.
> 1048576 shared_ptr<X> allocations + deallocations:
>    1.151 seconds.
>    1.593 seconds.
>    1.603 seconds.
> 1048576 shared_ptr<Y> allocations + deallocations:
>    1.652 seconds.
>    1.071 seconds.
>    1.072 seconds.
> 1048576 shared_ptr<Z> allocations + deallocations:
>    1.713 seconds.
>    1.732 seconds.
>    1.722 seconds.
>
> GNU C++ version 2.95.3-6 (mingw special)
> Win32
> SGI standard library
> BOOST_HAS_THREADS: (not defined)
> BOOST_SP_USE_STD_ALLOCATOR: (not defined)
> BOOST_SP_USE_QUICK_ALLOCATOR: (defined)
> 1048576 shared_ptr<int> allocations + deallocations:
>    1.151 seconds.
>    0.961 seconds.
>    0.931 seconds.
> 1048576 shared_ptr<X> allocations + deallocations:
>    0.571 seconds.
>    0.551 seconds.
>    0.571 seconds.
> 1048576 shared_ptr<Y> allocations + deallocations:
>    0.761 seconds.
>    0.55 seconds.
>    0.54 seconds.
> 1048576 shared_ptr<Z> allocations + deallocations:
>    0.941 seconds.
>    0.921 seconds.
>    0.951 seconds.

Wow, that's a much bigger improvement than I saw!  I wonder why?

-- 
                       David Abrahams
   dave_at_[hidden] * http://www.boost-consulting.com
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