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

From: Peter Dimov (pdimov_at_[hidden])
Date: 2003-01-30 14:03:26

From: "David Abrahams" <dave_at_[hidden]>
> >
> > Your test doesn't seem to terminate for me in a reasonable amount of
> > time (minutes) in any configuration.
>
> That was Cygwin GCC-3.2.

You made me download it.

GNU C++ version 3.2 20020927 (prerelease)
Cygwin
GNU libstdc++ version 20020927
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:
   1.281 seconds.
   1.552 seconds.
   1.232 seconds.
1048576 shared_ptr<X> allocations + deallocations:
   0.901 seconds.
   0.912 seconds.
   0.922 seconds.
1048576 shared_ptr<Y> allocations + deallocations:
   1.542 seconds.
   0.992 seconds.
   1.072 seconds.
1048576 shared_ptr<Z> allocations + deallocations:
   1.272 seconds.
   1.572 seconds.
   1.222 seconds.

GNU C++ version 3.2 20020927 (prerelease)
Cygwin
GNU libstdc++ version 20020927
BOOST_HAS_THREADS: (not defined)
BOOST_SP_USE_STD_ALLOCATOR: (defined)
BOOST_SP_USE_QUICK_ALLOCATOR: (not defined)
1048576 shared_ptr<int> allocations + deallocations:
   1.041 seconds.
   1.111 seconds.
   1.091 seconds.
1048576 shared_ptr<X> allocations + deallocations:
   0.901 seconds.
   0.821 seconds.
   0.831 seconds.
1048576 shared_ptr<Y> allocations + deallocations:
   1.442 seconds.
   0.831 seconds.
   0.831 seconds.
1048576 shared_ptr<Z> allocations + deallocations:
   1.022 seconds.
   1.092 seconds.
   1.011 seconds.

GNU C++ version 3.2 20020927 (prerelease)
Cygwin
GNU libstdc++ version 20020927
BOOST_HAS_THREADS: (not defined)
BOOST_SP_USE_STD_ALLOCATOR: (not defined)
BOOST_SP_USE_QUICK_ALLOCATOR: (defined)
1048576 shared_ptr<int> allocations + deallocations:
   1.632 seconds.
   1.052 seconds.
   1.032 seconds.
1048576 shared_ptr<X> allocations + deallocations:
   0.862 seconds.
   0.761 seconds.
   0.771 seconds.
1048576 shared_ptr<Y> allocations + deallocations:
   1.432 seconds.
   0.761 seconds.
   0.761 seconds.
1048576 shared_ptr<Z> allocations + deallocations:
   0.962 seconds.
   1.062 seconds.
   1.062 seconds.

std::allocator is good, but if you replace the "quick hack" deque with
something that allocates bigger pages, you may get rid of the warm up cost.