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	1387333375	1323M,65K
load			none	8241696	7M,880K	4895566091	4G,572M,794K
query			none	2563705088	2G,396M,962K	9535931128	8G,902M,176K
global			none	-291657007	-278M,149K	6276209565	5G,865M,470K
tc/jemalloc cache			none	1235204568	1177M,1006K	-1	-1K
sum of all trackers			none	3515494345	3G,280M,651K	-1	-1K
process resident memory			none	12052701184	11G,230M,360K	20425457664	19G,23M,240K
process virtual memory			none	65053134848	60G,599M,516K	65498976256	61G,708K