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	1387264410	1322M,1022K
load			none	0	0K	3884399074	3G,632M,462K
query			none	1145283200	1092M,232K	5423953024	5G,52M,701K
global			none	65344165	62M,324K	6276209565	5G,865M,470K
tc/jemalloc cache			none	801749128	764M,622K	-1	-1K
sum of all trackers			none	2012376493	1919M,155K	-1	-1K
process resident memory			none	8286289920	7G,734M,432K	15249911808	14G,207M,460K
process virtual memory			none	64465092608	60G,38M,720K	64842768384	60G,398M,904K