getmemoryinfo (0.16.3 RPC)

getmemoryinfo ("mode")
Returns an object containing information about memory usage.
Arguments:
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"):
"<malloc version="1">..."

Examples:
> bitcoin-cli getmemoryinfo 
> curl --user myusername --data-binary '{"jsonrpc": "1.0", "id":"curltest", "method": "getmemoryinfo", "params": [] }' -H 'content-type: text/plain;' http://127.0.0.1:8332/