Use of the JVM tuning JDK tool

JPS list the running virtual machine processes, using the following:

JPS [-option] [HostID]

Options	function
Q	Output only Lvmid, omit the name of the main class
M	Output the parameters of Main method
L	Output the full package name, apply the main class name, the full path name of the jar
V	Output JVM Parameters

Jstat

To monitor the virtual machine health status information, how to use:

jstat-<option> <pid> [Interval[s|ms]] 

Options	function
Gc	The amount of time that the GC operation accumulates, the total number of times that the GC has been performed, and the amount of space that is currently available for each heap area.
Gccapactiy	Outputs the minimum space limit (MS)/Maximum space limit (MX) for each heap area, the current size, and the number of times the GC is executed on top of each zone. (The current used space is not output and the GC execution time).
Gccause	Outputs the information provided by-gcutil and why the GC was last executed and the reason for the GC that is currently executing.
Gcnew	The GC performance data for the output generation space.
Gcnewcapacity	Statistics on the size of the output Cenozoic space.
Gcold	Output GC performance data for the old age space.
Gcoldcapacity	Output statistics of the size of the old age space.
Gcpermcapacity	Statistics that output the size of the persistent space.
Gcutil	Outputs the usage ratio for each heap area, as well as the total number of GC executions and events spent by GC operations.

Like what:

JSTAT-GC 28389 1s

Output JVM Runtime information every 1 seconds:

s0c    s1c    s0u    s1u      EC       EU        OC         OU       PC     PU    ygc    ygct FGC FGCT     GCT   
52416.0 52416.0 4744.9  0.0   419456.0 28180.6  2621440.0 439372.6 131072.0 33564.8 160472 1760.603      2.731 1763.334

column	Description	jstat Parameters
s0c	The size of the Survivor0 space. Unit KB.	-gc-gccapacity-gcnew-gcnewcapacity
S1c	The size of the Survivor1 space. Unit KB.	-gc-gccapacity-gcnew-gcnewcapacity
s0u	Survivor0 the size of the space already used. Unit KB.	-gc-gcnew
s1u	Survivor1 the size of the space already used. Unit KB.	-gc-gcnew
EC	The size of the Eden space. Unit KB.	-gc-gccapacity-gcnew-gcnewcapacity
EU	The size of Eden used space. Unit KB.	-gc-gcnew
Oc	The size of the old age space. Unit KB.	-gc-gccapacity-gcold-gcoldcapacity
OU	The old age has used the size of space. Unit KB.	-gc-gcold
Pc	The size of the persistent generation space. Unit KB.	-gc-gccapacity-gcold-gcoldcapacity-gcpermcapacity
Pu	The size of the space that is used for persistent generations. Unit KB.	-gc-gcold
Ygc	The number of times the generation of space GC time occurred.	-gc-gccapacity-gcnew-gcnewcapacity-gcold-gcoldcapacity-gcpermcapacity-gcutil-gccause
Ygct	The time taken by the new generation of GC processing.	-gc-gcnew-gcutil-gccause
FGC	The number of times the full GC occurred.	-gc-gccapacity-gcnew-gcnewcapacity-gcold-gcoldcapacity-gcpermcapacity-gcutil-gccause
Fgct	The time spent by the full GC operation.	-gc-gcold-gcoldcapacity-gcpermcapacity-gcutil-gccause
GCT	Total time spent by GC operations.	-gc-gcold-gcoldcapacity-gcpermcapacity-gcutil-gccause
Ngcmn	Cenozoic minimum space capacity, in kilobytes.	-gccapacity-gcnewcapacity
Ngcmx	Maximum space capacity in the Cenozoic, in kilobytes.	-gccapacity-gcnewcapacity
Ngc	Current space capacity in the new generation, in kilobytes.	-gccapacity-gcnewcapacity
Ogcmn	The minimum space capacity in the old age, in kilobytes.	-gccapacity-gcoldcapacity
Ogcmx	The maximum space capacity in the old age, in kilobytes.	-gccapacity-gcoldcapacity
OGC	The current space capacity system in the old age, in kilobytes.	-gccapacity-gcoldcapacity
Pgcmn	The minimum space capacity of a persistent generation, in kilobytes.	-gccapacity-gcpermcapacity
Pgcmx	The maximum space capacity, in kilobytes, for a persistent generation.	-gccapacity-gcpermcapacity
Pgc	The current space capacity, in kilobytes, for the persistent generation.	-gccapacity-gcpermcapacity
Pc