Re: [Boost-users] [pool] Speed of pool_allocator<>

From: Peter Dimov (pdimov_at_[hidden])
Date: 2004-07-01 09:33:28

Klaus Nowikow wrote:
>
> I changed the test program (see below). Now I use object_pool<>
> to create and destroy a number of elements (I use a vector<C*> to
> store them in the meantime). The results are even worse than before:
>
> new/delete:   0.08s
> object_pool: 25.20s

[...]

> template <template <class, class> class Pool>
> double Test()
> {
> Pool<C> P(CHUNK_SIZE);
> boost::timer Timer;
>
> std::vector<C*> V;
> for(int i = 0; i < NUM_ELEMENTS; ++i)
> {
> V.push_back(P.construct());
> }
> for(std::vector<C*>::iterator pos = V.begin(), end = V.end(); pos !=
> end; ++pos) {
> P.destroy(*pos);
> }
>
> return Timer.elapsed();
> }

Your test is still very unrealistic. You create a large number of objects in
one batch, then destroy them afterwards. A more realistic scenario would
have creation and destruction interleaved.

The most accurate test would be to try Boost.Pool with your actual
application and see how it affects its real-world performance. It's still
possible for it to be slower, of course, but at least you'd measure the real
thing.