Moved to : https://bitbucket.org/hatterjiang/jtop

Introduction

The java edition command of top.

Usage

Get jtop:

wget https://hatter-source-code.googlecode.com/svn/trunk/javatools/jtop/jtop.jar

Usage:

$ java -jar jtop.jar 
[ERROR] pid is not assigned.
Usage[b121209]:
java -jar jtop.jar [options] <pid> [<interval> [<count>]]
-OR-
java -cp jtop.jar jtop [options] <pid> [<interval> [<count>]]
    -size <B|K|M|G|H>             Size, case insensitive (default: B, H for human)
    -thread <N>                   Thread Top N (default: 5)
    -stack <N>                    Stacktrace Top N (default: 8)
    -excludes                     Excludes (string.contains)
    -includes                     Includes (string.contains, excludes than includes)
    --color                       Display color (default: off)
    --sortmem                     Sort by memory allocted (default: off)
    --summaryoff                  Do not display summary (default: off)
    --advanced                    Do display like 'top' (default: off)

Use this command to view the eclipse's top:

$ java -jar jtop.jar -size h -thread 3 -stack 4 387

You would see:

NEW ROUND ================================================== 
Heap Memory: INIT=40.00M  USED=145.16M  COMMITED=278.57M  MAX=379.88M
NonHeap Memory: INIT=23.19M  USED=74.11M  COMMITED=118.62M  MAX=304.00M
GC ParNew  VALID  [Par Eden Space, Par Survivor Space]  GC=103  GCT=1532
GC ConcurrentMarkSweep  VALID  [Par Eden Space, Par Survivor Space, CMS Old Gen, CMS Perm Gen]  GC=7  GCT=75
ClassLoading LOADED=8776  TOTAL_LOADED=8780  UNLOADED=4
Total threads: 24  CPU=30 (1.49%)  USER=21 (1.09%)
NEW=0  RUNNABLE=7  BLOCKED=0  WAITING=10  TIMED_WAITING=7  TERMINATED=0  
main  TID=1  STATE=RUNNABLE  CPU_TIME=20 (1.03%)  USER_TIME=13 (0.68%)
	org.eclipse.swt.internal.cocoa.OS.objc_msgSend_bool(Native Method)
	org.eclipse.swt.internal.cocoa.NSRunLoop.runMode(NSRunLoop.java:42)
	org.eclipse.swt.widgets.Display.sleep(Display.java:4193)
	org.eclipse.ui.application.WorkbenchAdvisor.eventLoopIdle(WorkbenchAdvisor.java:364)

RMI TCP Connection(2)-10.18.214.175  TID=102  STATE=RUNNABLE  CPU_TIME=9 (0.45%)  USER_TIME=8 (0.40%)
	sun.management.ThreadImpl.dumpThreads0(Native Method)
	sun.management.ThreadImpl.dumpAllThreads(ThreadImpl.java:433)
	me.hatter.tools.jtop.rmi.RmiServer.listThreadInfos(RmiServer.java:104)
	sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

Poller SunPKCS11-Darwin  TID=11  STATE=TIMED_WAITING  CPU_TIME=0 (0.01%)  USER_TIME=0 (0.00%)
	java.lang.Thread.sleep(Native Method)
	sun.security.pkcs11.SunPKCS11$TokenPoller.run(SunPKCS11.java:692)
	java.lang.Thread.run(Thread.java:680)

Output like 'top' use arguemnt --A or --advanced:

$ java -jar jtop.jar --A --C 387
-OR-
$ java -jar jtop.jar ---AC 387

Principle

1. Connection to the PORT using RMI
2. If failed, find VirtualMachine by PID
1. Attach the agent to the VM
2. Start RMI service in agent
3. Use RMI, connect to VM, then get MXBean
4. Sort and display

Detail see: HowDoesJtopWork