Re: osd_memory_target in Rook, set automatically via k8s Resource Requests, and hardware recommendations

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FWIW on Luminous / Ubunto Trusty (at least) I would sometimes find a handful to tens of GB “released” by tcmalloc but not reclaimed.  In such circumstances a “heap release” usually did wonders to free up physmem / VM.  YMMV.


> 
> 
>> - AND... there is no guarantee that the kernel will actually reclaim memory that OSDs release/unmap
> Correct, we can't explicitly force the kernel to reclaim memory.
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