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	1379061698	1315M,179K
load			none	0	0K	8317074891	7G,763M,799K
query			none	2741101919	2G,566M,121K	4967337375	4G,641M,227K
global			none	215770597	205M,793K	15594555773	14G,536M,130K
tc/jemalloc cache			none	862888864	822M,936K	-1	-1K
sum of all trackers			none	3819761380	3G,570M,827K	-1	-1K
process resident memory			none	8772734976	8G,174M,340K	21430394880	19G,981M,632K
process virtual memory			none	64165101568	59G,776M,624K	64517595136	60G,88M,792K