getmemoryinfo ("mode")

The getmemoryinfo RPC returns information about memory usage.

*bitcoin-cli help getmemoryinfo

getmemoryinfo ("mode")
Returns an object containing information about memory usage.
1. "mode" determines what kind of information is returned. This argument is optional, the default mode is "stats".
  - "stats" returns general statistics about memory usage in the daemon.
  - "mallocinfo" returns an XML string describing low-level heap state (only available if compiled with glibc 2.10+).

Result (mode "stats"):
  "locked": {               (json object) Information about locked memory manager
    "used": xxxxx,          (numeric) Number of bytes used
    "free": xxxxx,          (numeric) Number of bytes available in current arenas
    "total": xxxxxxx,       (numeric) Total number of bytes managed
    "locked": xxxxxx,       (numeric) Amount of bytes that succeeded locking. If this number is smaller than total, locking pages failed at some point and key data could be swapped to disk.
    "chunks_used": xxxxx,   (numeric) Number allocated chunks
    "chunks_free": xxxxx,   (numeric) Number unused chunks

Result (mode "mallocinfo"):

> bitcoin-cli getmemoryinfo 
> curl --user myusername --data-binary '{"jsonrpc": "1.0", "id":"curltest", "method": "getmemoryinfo", "params": [] }' -H 'content-type: text/plain;'