Thanks Alex,
Your explanation was the motivation I needed to attempt the recursive

> Yes and no. It is correct that the garbage collector does not run at each
> release. Instead, it runs when a new cell is needed and the current heap is
> found to be full.
> So garbage collection is indeed "immediate", in that as long as there is
> free
> memory no collection is needed, and if not, the collector runs (typically
> just a
> few milliseconds).
> If after a collection still no cells are available, the heap is increased.
> Therefore, if a program slowly allocates more and more memory, it helps
> intially
> to allocate a bigger heap, e.g. (gc 800) or whatever size is needed in the
> long
> run.

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