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	1444181354	1377M,285K
load			none	0	0K	13349659431	12G,443M,232K
query			none	3628236307	3G,388M,159K	5490238915	5G,115M,921K
global			none	-341411369	-325M,609K	15594555773	14G,536M,130K
tc/jemalloc cache			none	746203840	711M,650K	-1	-1K
sum of all trackers			none	4033028778	3G,774M,200K	-1	-1K
process resident memory			none	10350702592	9G,655M,204K	22839894016	21G,277M,840K
process virtual memory			none	71625719808	66G,723M,624K	72195641344	67G,243M,132K