Running Ceph with the tcmalloc heap profiler

When running a Ceph cluster from sources, the tcmalloc heap profiler can be started for all daemons with:

CEPH_HEAP_PROFILER_INIT=true \
  CEPH_NUM_MON=1 CEPH_NUM_OSD=3 \
  ./vstart.sh -n -X -l mon osd

The osd.0 stats can be displayed with

$ ceph tell osd.0 heap stats
*** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***
osd.0tcmalloc heap stats:------------------------------------------------
MALLOC:        6084984 (    5.8 MiB) Bytes in use by application
MALLOC: +       180224 (    0.2 MiB) Bytes in page heap freelist
MALLOC: +      1430776 (    1.4 MiB) Bytes in central cache freelist
MALLOC: +      7402112 (    7.1 MiB) Bytes in transfer cache freelist
MALLOC: +      5873424 (    5.6 MiB) Bytes in thread cache freelists
MALLOC: +      1290392 (    1.2 MiB) Bytes in malloc metadata
MALLOC:   ------------
MALLOC: =     22261912 (   21.2 MiB) Actual memory used (physical + swap)
MALLOC: +            0 (    0.0 MiB) Bytes released to OS (aka unmapped)
MALLOC:   ------------
MALLOC: =     22261912 (   21.2 MiB) Virtual address space used
MALLOC:
MALLOC:           1212              Spans in use
MALLOC:             65              Thread heaps in use
MALLOC:           8192              Tcmalloc page size
------------------------------------------------

See the Ceph memory profiling documentation for more information.

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