Comment (by Ian Hinder):

I’m skeptical about RSS. I’ve seen processes grow in RSS until it reaches max memory, and then run perfectly happily while RSS remains flat. My impression is that pages are not actually being returned to the OS until there is a need for them. So, painful as it might be, I would run your test until you reach the point that the actual problem occurred; i.e. the OOM.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2194/memory-increase-during-regridding