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	417398442	398M,63K
overview	load		none	0	0K	927723678	884M,764K
overview	query		none	0	0K	1543450924	1471M,972K
overview	global		none	58580273	55M,887K	2186304587	2G,37M,23K
overview	tc/jemalloc cache		none	926208400	883M,308K	-1	-1K
overview	sum of all trackers		none	984788673	939M,171K	-1	-1K
overview	process resident memory		none	2270515200	2G,117M,340K	4788424704	4G,470M,612K
overview	reserved memory		none	0	0K	-1	-1K
overview	process virtual memory		none	48926519296	45G,579M,988K	48926650368	45G,580M,92K