I'm not really an expert, but here are my 2 cents:
To the best of my limited knowlede, there is no direct way of ensuring
that the total memory being requested by N workers remains below a
certain threshold. You can control the number of child processes
forked by foreach/doPar in the registerDoPar
I've got allocations on a couple of shared memory supercomputers, which
I use to run computationally-intensive scripts on multiple cores of the
same node. I've got 24 cores on the one, and 48 on the other.
In both cases, there is a hard memory limit, which is shared among the
cores in the nod
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