12 May
2020
12 May
'20
4:56 p.m.
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.