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)
experimental			none	0	0K	0	0K
clone			none	0	0K	0	0K
schema_change			none	0	0K	0	0K
compaction			none	0	0K	1445273736	1378M,328K
load			none	978768	955K	13349659431	12G,443M,232K
query			none	7681020713	7G,157M,196K	9057514985	8G,445M,941K
global			none	-549415156	-523M,986K	279494341627	260G,306M,588K
tc/jemalloc cache			none	705417072	672M,755K	-1	-1K
sum of all trackers			none	7838001397	7G,306M,922K	-1	-1K
process resident memory			none	14948425728	13G,943M,952K	23943352320	22G,306M,164K
process virtual memory			none	78327795712	72G,971M,212K	78806183936	73G,403M,444K