找到对应进程的PID
[root@master1 rundeck]# top
top - 03:10:32 up 8:06, 2 users, load average: 0.08, 0.03, 0.05
Tasks: 243 total, 2 running, 241 sleeping, 0 stopped, 0 zombie
%Cpu(s): 0.1 us, 0.1 sy, 0.0 ni, 99.7 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem : 3874956 total, 383964 free, 1264232 used, 2226760 buff/cache
KiB Swap: 4063228 total, 4063228 free, 0 used. 2329668 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
25136 root 20 0 4769720 940148 16168 S 0.6 24.3 3:56.49 java
25389 root 20 0 148200 2128 1420 R 0.6 0.1 0:00.07 top
1 root 20 0 43388 3644 2352 S 0.0 0.1 0:04.88 systemd
2 root 20 0 0 0 0 S 0.0 0.0 0:00.03 kthreadd
3 root 20 0 0 0 0 S 0.0 0.0 0:03.43 ksoftirqd/0
5 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kworker/0:0H
7 root rt 0 0 0 0 S 0.0 0.0 0:00.14 migration/0
8 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcu_bh
9 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/0
10 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/1
11 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/2
12 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/3
13 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/4
显示线程列表，同时按照CPU占用高的线程排序
[root@master1 rundeck]# ps -mp 25136 -o THREAD,tid,time |sort -rn
USER %CPU PRI SCNT WCHAN USER SYSTEM TID TIME
root 5.9 - - - - - - 00:03:56
root 1.5 19 - futex_ - - 25148 00:01:01
root 1.5 19 - futex_ - - 25147 00:01:01
root 1.5 19 - futex_ - - 25138 00:01:01
root 0.2 19 - futex_ - - 25151 00:00:08
root 0.2 19 - futex_ - - 25149 00:00:11
root 0.0 19 - inet_c - - 25166 00:00:00
root 0.0 19 - futex_ - - 25195 00:00:00
root 0.0 19 - futex_ - - 25194 00:00:00
root 0.0 19 - futex_ - - 25193 00:00:00
root 0.0 19 - futex_ - - 25188 00:00:00
root 0.0 19 - futex_ - - 25187 00:00:01
root 0.0 19 - futex_ - - 25186 00:00:01
root 0.0 19 - futex_ - - 25185 00:00:01
root 0.0 19 - futex_ - - 25184 00:00:00
root 0.0 19 - futex_ - - 25183 00:00:00
root 0.0 19 - futex_ - - 25182 00:00:00
root 0.0 19 - futex_ - - 25181 00:00:01
root 0.0 19 - futex_ - - 25180 00:00:00
root 0.0 19 - futex_ - - 25179 00:00:00
root 0.0 19 - futex_ - - 25178 00:00:01
root 0.0 19 - futex_ - - 25177 00:00:00
root 0.0 19 - futex_ - - 25176 00:00:00
root 0.0 19 - futex_ - - 25175 00:00:00
root 0.0 19 - futex_ - - 25174 00:00:00
root 0.0 19 - futex_ - - 25173 00:00:00
root 0.0 19 - futex_ - - 25172 00:00:00
root 0.0 19 - futex_ - - 25171 00:00:00
root 0.0 19 - futex_ - - 25170 00:00:03
root 0.0 19 - futex_ - - 25168 00:00:00
root 0.0 19 - futex_ - - 25165 00:00:00
root 0.0 19 - futex_ - - 25163 00:00:00
root 0.0 19 - futex_ - - 25162 00:00:00
root 0.0 19 - futex_ - - 25161 00:00:00
root 0.0 19 - futex_ - - 25160 00:00:00
root 0.0 19 - futex_ - - 25158 00:00:00
root 0.0 19 - futex_ - - 25155 00:00:00
root 0.0 19 - futex_ - - 25154 00:00:01
root 0.0 19 - futex_ - - 25150 00:00:00
root 0.0 19 - futex_ - - 25146 00:00:00
root 0.0 19 - futex_ - - 25145 00:00:00
root 0.0 19 - futex_ - - 25144 00:00:00
root 0.0 19 - futex_ - - 25143 00:00:01
root 0.0 19 - futex_ - - 25142 00:00:03
root 0.0 19 - futex_ - - 25141 00:00:03
root 0.0 19 - futex_ - - 25140 00:00:03
root 0.0 19 - futex_ - - 25139 00:00:03
root 0.0 19 - futex_ - - 25136 00:00:00
root 0.0 19 - ep_pol - - 25167 00:00:00
root 0.0 19 - ep_pol - - 25164 00:00:00
将线程的PID转换为16进制
[root@master1 rundeck]# printf "%x\n" 25148
623c
使用jstack打印该进程下面的此线程的堆栈信息
[root@master1 rundeck]# jstack 25136 | grep "623c" -A 30
"C2 CompilerThread1" #6 daemon prio=9 os_prio=0 tid=0x00007ff4a41e6800 nid=0x623c waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"C2 CompilerThread0" #5 daemon prio=9 os_prio=0 tid=0x00007ff4a41d7000 nid=0x623b waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"Signal Dispatcher" #4 daemon prio=9 os_prio=0 tid=0x00007ff4a41d5000 nid=0x623a runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"Finalizer" #3 daemon prio=8 os_prio=0 tid=0x00007ff4a41ab000 nid=0x6239 in Object.wait() [0x00007ff4941f0000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:144)
- locked <0x00000000c000d3d8> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:165)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:216)
"Reference Handler" #2 daemon prio=10 os_prio=0 tid=0x00007ff4a41a6000 nid=0x6238 in Object.wait() [0x00007ff4942f1000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:502)
at java.lang.ref.Reference.tryHandlePending(Reference.java:191)
- locked <0x00000000c000d590> (a java.lang.ref.Reference$Lock)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153)
"VM Thread" os_prio=0 tid=0x00007ff4a419c800 nid=0x6237 runnable
"GC task thread#0 (ParallelGC)" os_prio=0 tid=0x00007ff4a405e000 nid=0x6233 runnable
"GC task thread#1 (ParallelGC)" os_prio=0 tid=0x00007ff4a4060000 nid=0x6234 runnable
打印GC 信息
[root@master1 rundeck]# jstat -gcutil 25136 200 50
S0 S1 E O M CCS YGC YGCT FGC FGCT GCT
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
52.90 0.00 18.26 60.04 96.67 91.29 60 2.571 4 2.037 4.608
导出内存快照
[root@master1 rundeck]# jmap -dump:live,format=b,file=dump.hprof 25136
Dumping heap to /home/rundeck/rundeck/dump.hprof ...
Heap dump file created
寻找合适的工具分析内存。