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VM overview mode

Command-line: jvmtop.sh

Columns are:

PID = process id

MAIN-CLASS = the "jvm name" but often the entry point class (with used main() method)

HPCUR = currently used heap memory

HPMAX = maximum heap memory the jvm can allocate

NHCUR = currently used non-heap memory (e.g. PermGen)

NHMAX = maximum non-heap memory the jvm can allocate

CPU = CPU utilization

GC = percentage of time spent in garbage collection (~100% means that the process does garbage collection only)

VM = Shows JVM vendor, java version and release number (S6U37 = Sun JVM 6, Update 37)

USERNAME = Username which owns this jvm process

#T = Number of jvm threads

DL = If !D is shown if the jvm detected a thread deadlock

Detail mode (Single-VM monitoring)

Command-line: jvmtop.sh <pid>

 JvmTop 0.4.1 alpha   amd64,  4 cpus, Linux 2.6.18-34

 https://github.com/patric-r/jvmtop



 PID 3539: org.apache.catalina.startup.Bootstrap

 ARGS: start

 VMARGS: -Djava.util.logging.config.file=/home/webserver/apache-tomcat-5.5[...]

 VM: Sun Microsystems Inc. Java HotSpot(TM) 64-Bit Server VM 1.6.0_25

 UP: 869:33m #THR: 106  #THRPEAK: 143  #THRCREATED: 128020 USER: webserver

 CPU:  4.55% GC:  3.25% HEAP: 137m / 227m NONHEAP:  75m / 304m

 Note: Only top 10 threads (according cpu load) are shown!



  TID   NAME                                    STATE    CPU  TOTALCPU BLOCKEDBY

     25 http-8080-Processor13                RUNNABLE  4.55%     1.60%

 128022 RMI TCP Connection(18)-10.101.       RUNNABLE  1.82%     0.02%

  36578 http-8080-Processor164               RUNNABLE  0.91%     2.35%

  36453 http-8080-Processor94                RUNNABLE  0.91%     1.52%

     27 http-8080-Processor15                RUNNABLE  0.91%     1.81%

     14 http-8080-Processor2                 RUNNABLE  0.91%     3.17%

 128026 JMX server connection timeout   TIMED_WAITING  0.00%     0.00%

 128025 JMX server connection timeout   TIMED_WAITING  0.00%     0.00%

 128024 JMX server connection timeout   TIMED_WAITING  0.00%     0.00%

 128023 JMX server connection timeout   TIMED_WAITING  0.00%     0.00%

Columns are:

TID = thread id

NAME = thread name

STATE = current thread state

CPU = current CPU utilization (in ratio to available cpu time on all processors)

TOTALCPU = CPU utilization (in ratio to process cpu consumption) since the thread is alive

BLOCKEDBY = the thread id which blocks this thread