java cpu load

---

$ps -Lp 179093 cu | more

USER        PID    LWP %CPU NLWP %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
admin    179093 179093  0.0  383 54.5 5803448 4572012 ?     Sl   Aug05   0:00 java
admin    179093 179097  0.0  383 54.5 5803448 4572012 ?     Sl   Aug05   0:01 java
admin    179093 179100  0.0  383 54.5 5803448 4572012 ?     Sl   Aug05   8:43 java
admin    179093 179101  0.0  383 54.5 5803448 4572012 ?     Sl   Aug05   8:43 java
admin    179093 179102  0.0  383 54.5 5803448 4572012 ?     Sl   Aug05   8:44 java
admin    179093 179103  0.0  383 54.5 5803448 4572012 ?     Sl   Aug05   8:45 java
admin    179093 179104  0.0  383 54.5 5803448 4572012 ?     Sl   Aug05   2:21 java
admin    179093 179105  0.0  383 54.5 5803448 4572012 ?     Sl   Aug05  55:50 java
admin    179093 179106  0.0  383 54.5 5803448 4572012 ?     Sl   Aug05   0:03 java
admin    179093 179107  0.0  383 54.5 5803448 4572012 ?     Sl   Aug05   0:15 java
admin    179093 179108  0.0  383 54.5 5803448 4572012 ?     Sl   Aug05   0:00 java
admin    179093 179109  0.0  383 54.5 5803448 4572012 ?     Sl   Aug05   0:00 java
admin    179093 179110  0.0  383 54.5 5803448 4572012 ?     Sl   Aug05   1:02 java
admin    179093 179111  0.0  383 54.5 5803448 4572012 ?     Sl   Aug05   0:58 java
admin    179093 179112  0.0  383 54.5 5803448 4572012 ?     Sl   Aug05   0:00 java
admin    179093 179113  0.0  383 54.5 5803448 4572012 ?     Sl   Aug05  29:21 java

......

---

$printf "%x\n" 179105

2bba1

---

$jstack -l 179093 > jstack.log

$vi jstack.log

search 2bba1

"Reference Handler" daemon prio=10 tid=0x00002aaaab073800 nid=0x2bba2 in Object.wait() [0x00000000405cd000]
   java.lang.Thread.State: WAITING (on object monitor)
        at java.lang.Object.wait(Native Method)
        at java.lang.Object.wait(Object.java:503)
        at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:133)
        - locked <0x0000000772d40fd8> (a java.lang.ref.Reference$Lock)

   Locked ownable synchronizers:
        - None

"main" prio=10 tid=0x00002aaaab072000 nid=0x2bb99 runnable [0x0000000041e45000]
   java.lang.Thread.State: RUNNABLE
        at java.net.PlainSocketImpl.socketAccept(Native Method)
        at java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:398)
        at java.net.ServerSocket.implAccept(ServerSocket.java:530)
        at java.net.ServerSocket.accept(ServerSocket.java:498)
        at org.apache.catalina.core.StandardServer.await(StandardServer.java:466)
        at org.apache.catalina.startup.Catalina.await(Catalina.java:787)
        at org.apache.catalina.startup.Catalina.start(Catalina.java:733)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:320)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:454)

   Locked ownable synchronizers:
        - None

"VM Thread" prio=10 tid=0x00002aaaab10d000 nid=0x2bba1 runnable

"Gang worker#0 (Parallel GC Threads)" prio=10 tid=0x00002aaaab108800 nid=0x2bb9c runnable

"Gang worker#1 (Parallel GC Threads)" prio=10 tid=0x00002aaaab109800 nid=0x2bb9d runnable

"Gang worker#2 (Parallel GC Threads)" prio=10 tid=0x00002aaaab10a000 nid=0x2bb9e runnable

"Gang worker#3 (Parallel GC Threads)" prio=10 tid=0x00002aaaab10a800 nid=0x2bb9f runnable

"Concurrent Mark-Sweep GC Thread" prio=10 tid=0x00002aaaab10c000 nid=0x2bba0 runnable
"VM Periodic Task Thread" prio=10 tid=0x00002aaaab10d800 nid=0x2bba9 waiting on condition

JNI global references: 343

......

---

here is a script:

#!/bin/sh
# write by    : oldmanpushcart@gmail.com
# date        : 2014-01-16
# version     : 0.07
typeset top=${1:-10}
typeset pid=${2:-$(pgrep -u $USER java)}
typeset tmp_file=/tmp/java_${pid}_$$.trace 

/opt/taobao/java/bin/jstack $pid > $tmp_file
ps H -eo user,pid,ppid,tid,time,%cpu --sort=%cpu --no-headers\
        | tail -$top\
        | awk -v "pid=$pid" '$2==pid{print $4"\t"$6}'\
        | while read line;
do
        typeset nid=$(echo "$line"|awk '{printf("0x%x",$1)}')
        typeset cpu=$(echo "$line"|awk '{print $2}')
        awk -v "cpu=$cpu" '/nid='"$nid"'/,/^$/{print $0"\t"(isF++?"":"cpu="cpu"%");}' $tmp_file
done 

rm -f $tmp_file