“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+).
Returns (mode "stats")
{ (json object)"locked": { (json object) Information about locked memory manager"used": n, (numeric) Number of bytes used"free": n, (numeric) Number of bytes available in current arenas"total": n, (numeric) Total number of bytes managed"locked": n, (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": n, (numeric) Number allocated chunks"chunks_free": n (numeric) Number unused chunks }}