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	1447948575	1380M,892K
load			none	-1020196	-996K	13349659431	12G,443M,232K
query			none	9467667878	8G,837M,73K	11977222241	11G,158M,378K
global			none	-574730432	-548M,108K	279494341627	260G,306M,588K
tc/jemalloc cache			none	842370096	803M,355K	-1	-1K
sum of all trackers			none	9734287346	9G,67M,347K	-1	-1K
process resident memory			none	17171390464	15G,1015M,936K	23966162944	22G,327M,936K
process virtual memory			none	78449754112	73G,63M,528K	79242604544	73G,819M,652K