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	725046	708K	6984430406	6G,516M,892K
query			none	3393737380	3G,164M,532K	10696767031	9G,985M,237K
global			none	-620730717	-591M,998K	5185940339	4G,849M,714K
tc/jemalloc cache			none	909606344	867M,479K	-1	-1K
sum of all trackers			none	3683338053	3G,440M,721K	-1	-1K
process resident memory			none	12192251904	11G,363M,448K	20534329344	19G,127M,64K
process virtual memory			none	86553595904	80G,623M,964K	86973235200	81G,144K