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	77824	76K
schema_change			none	0	0K	0	0K
compaction			none	0	0K	2831336049	2G,652M,176K
load			none	885808	865K	6984430406	6G,516M,892K
query			none	6100069476	5G,697M,491K	10696767031	9G,985M,237K
global			none	-1973095131	-1881M,706K	5185940339	4G,849M,714K
tc/jemalloc cache			none	925419440	882M,561K	-1	-1K
sum of all trackers			none	5053279593	4G,723M,187K	-1	-1K
process resident memory			none	17995440128	16G,777M,808K	23247085568	21G,666M,152K
process virtual memory			none	87386820608	81G,394M,580K	87705747456	81G,698M,736K