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	49152	48K
schema_change			none	0	0K	0	0K
compaction			none	0	0K	1270709507	1211M,863K
load			none	914052	892K	4527516269	4G,221M,794K
query			none	497791769	474M,748K	1245427577	1187M,749K
global			none	152863601	145M,800K	5185940339	4G,849M,714K
tc/jemalloc cache			none	754362136	719M,425K	-1	-1K
sum of all trackers			none	1405931558	1340M,820K	-1	-1K
process resident memory			none	5882613760	5G,490M,100K	11328315392	10G,563M,536K
process virtual memory			none	58403270656	54G,401M,716K	58738987008	54G,721M,884K