[Flow] [Doctrine] Why memory usage constantly increases on batch inserts

[Pavlina Drosos]

Hi all, 

I have recently tried a very simple batch inserts example with Doctrine inside a Typo3 Flow command controller, exactly like this:

http://www.doctrine-project.org/blog/doctrine2-batch-processing.html (the Mass inserts example).

I call $this->entityManager->clear(); and gc_collect_cycles(); inside the controller, exactly like in the example, but my memory usage constantly increases.

Could someone tell me why is this happening and how to avoid it?

Thanks.