Re: [Stlport-devel] Tweaking vector allocation

[Petr O. <pt...@is...>]

On Saturday 02 August 2008 09:09:00 Nigel Stewart wrote:
> ...
> But there are quite a few allocators involved in std::hash_map
> with the internal vector and slist, including temporary ones.

Why not to change allocator on malloc or new? Otherwise you
depends upon internal implementation of ... well, std::hash_map.

In any case, change implementation of std::hash_map just because
you want to develop specific allocator ... bad suggestion IMO.

> Having allocators that are costly to copy or swap don't seem
> so promising.  Nor any assumption that the same allocator
> is responsible for allocating and deallocating a node.
> 
> My main aim is to deal with list, set and map nodes by
> allocating larger pieces of memory and subdividing those
> to reduce malloc/free traffic and overhead.
> 
> I guess this kind of optimisation is not new, but I don't
> see too much online regarding custom allocators for
> std::hash_map, std::list and std::map.
>