Memory usage by subsystem

*Notice:

1. MemTracker only counts the memory on part of the main execution path, which is usually less than the real process memory.

2. each `type` is the sum of a set of tracker values, `sum of all trackers` is the sum of all trackers of all types, .

3. `process resident memory` is the physical memory of the process, from /proc VmRSS VmHWM.

4. `process virtual memory` is the virtual memory of the process, from /proc VmSize VmPeak.

5.`/mem_tracker?type=` to view the memory details of each type, for example, `/mem_tracker?type=query` will list the memory of all queries; `/mem_tracker?type=global` will list the memory of all Cache, metadata and other global life cycles.

see documentation for details.

Type	Label	Parent Label	Limit	Current Consumption(Bytes)	Current Consumption(Normalize)	Peak Consumption(Bytes)	Peak Consumption(Normalize)
overview	other		none	0	0K	0	0K
overview	schema_change		none	0	0K	0	0K
overview	compaction		none	0	0K	0	0K
overview	load		none	0	0K	140243688	133M,764K
overview	query		none	0	0K	282686912	269M,605K
overview	global		none	49298260	47M,14K	49420909	47M,134K
overview	tc/jemalloc_cache		none	436346800	416M,135K	-1	-1K
overview	tc/jemalloc_metadata		none	244743712	233M,415K	-1	-1K
overview	sum of all trackers		none	730388772	696M,566K	-1	-1K
overview	process resident memory		none	1331896320	1270M,200K	4495998976	4G,191M,736K
overview	reserve_memory		none	0	0K	-1	-1K
overview	process virtual memory		none	104590213120	97G,417M,0K	104598614016	97G,425M,12K