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	8241696	7M,880K	3887829016	3G,635M,740K
query			none	2056873504	1961M,601K	7538283872	7G,21M,69K
global			none	-135012311	-128M,775K	6276209565	5G,865M,470K
tc/jemalloc cache			none	873791384	833M,319K	-1	-1K
sum of all trackers			none	2803894273	2G,626M,2K	-1	-1K
process resident memory			none	11133767680	10G,377M,1012K	17772347392	16G,565M,32K
process virtual memory			none	64966021120	60G,516M,436K	65360482304	60G,892M,628K