Comment (by Roland Haas):

I ran the “trunk” code once more, this time advising malloc to return memory to the OS as soon as possible by setting MALLOC_TRIM_THRESHOLD_=0and MALLOC_TOP_PAD_=0 (see man mallopt) and this reduces RSS significantly:

For glibc (ie GNU/Linux, no tcmalloc, no jemalloc) one can use the function malloc_trim to do the same thing. A solution without having to modify code is to set the two variables mentioned above in your RunScript:

export MALLOC_TRIM_THRESHOLD_=0
export MALLOC_TOP_PAD_=0

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