Re: [Boost-users] fast_pool_allocator, std::multi_map and purge_memory

Subject: Re: [Boost-users] fast_pool_allocator, std::multi_map and purge_memory
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2009-08-31 11:07:34

AMDG

Soeren Meyer-Eppler wrote:
> I have written a small test program to measure the performance
> benefit of using a boost::fast_pool_allocator vs the default system
> allocator in conjunction with a std::multi_map. Memory overhead is
> ~16% lower and the boost allocator is ~4x faster - sweet. However, I
> can't release the allocated memory via the singleton_pool interface
> as described in the documentation.
>
> In my test program quoted below the call to purge_memory always
> returns 0 and according to window's task manager the memory has not
> been released. An even simpler test just using an allocator for ints
> and allocating/relasing/purging 10.000.000 ints works as expected.
> What am I doing wrong?
>   

std::multi_map doesn't allocate object of the value_type.
It uses Allocator::rebind to allocate objects of its internal
node type, which contains extra member.

In Christ,
Steven Watanabe