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	1448933447	1381M,830K
load			none	1728732	1688K	13349659431	12G,443M,232K
query			none	10960411654	10G,212M,679K	13937414126	12G,1003M,771K
global			none	-885743616	-844M,728K	279494341627	260G,306M,588K
tc/jemalloc cache			none	708606104	675M,798K	-1	-1K
sum of all trackers			none	10785002874	10G,45M,389K	-1	-1K
process resident memory			none	18774016000	17G,496M,304K	24150712320	22G,503M,936K
process virtual memory			none	78536044544	73G,145M,828K	79264374784	73G,840M,408K