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I found an article that explains at least some of the extra resident memory use: it is about how malloc and free work and a very good read. It has two parts:...

Thank you both for your answers.
Lindley, I was aware of that, but when I delete a bunch of objects, on subsequent generation of objects the resident memory shouldn't go up or not as much. But it...

bertandernie,

Thanks for the reply, I considered that, but I think there is more happening. Let me give an example of a short run which I profiled. (My final runs run out of memory on a system...

I programmed a simulation model that uses lot's (~1e8) small objects, stored in std::map. These number objects increases as the simulation progresses in time. The model naturally uses a lot of ram,...