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	1120773183	1068M,873K
load			none	1047080	1022K	9219549474	8G,600M,458K
query			none	262085344	249M,966K	1964174176	1873M,186K
global			none	-1033893155	-985M,1021K	6366515621	5G,951M,596K
tc/jemalloc cache			none	623926600	595M,23K	-1	-1K
sum of all trackers			none	-146834131	-140M,32K	-1	-1K
process resident memory			none	5946810368	5G,551M,328K	15653781504	14G,592M,624K
process virtual memory			none	72067211264	67G,120M,664K	72495747072	67G,529M,340K