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欢迎来到Riguz的小站！这是一个私人wiki，用来记录一些我的笔记。
查看“︁JVM optimization”︁的源代码
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JVM optimization
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This is a note of jvm optimization of a production service. [[Image:dynamic-cpu-high.png]] =Linux system tool = == top == Use top to view process status: <syntaxhighlight lang="bash"> $ top top - 10:55:37 up 1234 days, 20:33, 1 user, load average: 26.61, 31.80, 35.25 Tasks: 485 total, 2 running, 483 sleeping, 0 stopped, 0 zombie %Cpu(s): 82.8 us, 9.4 sy, 0.0 ni, 5.6 id, 0.0 wa, 0.0 hi, 2.2 si, 0.0 st KiB Mem : 26359952+total, 10300115+free, 79046432 used, 81551928 buff/cache KiB Swap: 0 total, 0 free, 0 used. 17903020+avail Mem PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 35253 work 20 0 27.3g 10.6g 11532 S 817.5 4.2 795248:54 java 38200 work 20 0 27.2g 10.4g 11480 S 774.6 4.1 782100:51 java 33196 work 20 0 27.2g 10.5g 11496 S 663.0 4.2 767660:17 java 38110 work 20 0 27.2g 10.4g 11496 S 368.3 4.2 717635:28 java 38489 work 20 0 27.2g 10.5g 11516 S 286.1 4.2 797625:38 java 198487 work 20 0 134384 18352 888 R 64.0 0.0 0:03.06 netstat 120786 work 20 0 21.7g 4.8g 7032 S 15.5 1.9 410952:23 java 120732 work 20 0 21.7g 4.8g 6996 S 11.2 1.9 346910:48 java 120726 work 20 0 21.7g 4.8g 6980 S 10.2 1.9 355160:19 java 120838 work 20 0 21.7g 4.9g 7244 S 5.6 1.9 407095:04 java 198488 work 20 0 113540 976 820 S 2.3 0.0 0:00.13 awk 197696 root 20 0 0 0 0 S 0.7 0.0 0:00.34 kworker/15:2 10 root 20 0 0 0 0 S 0.3 0.0 10342:55 rcu_sched 161 root 20 0 0 0 0 S 0.3 0.0 947:20.63 ksoftirqd/30 18515 root 20 0 573816 14272 2968 S 0.3 0.0 250:14.40 tuned </syntaxhighlight> View a specific process: <syntaxhighlight lang="bash"> $ top -Hp 35253 top - 10:58:20 up 1234 days, 20:35, 1 user, load average: 28.47, 31.40, 34.61 Threads: 968 total, 3 running, 965 sleeping, 0 stopped, 0 zombie %Cpu(s): 57.2 us, 6.7 sy, 0.0 ni, 33.8 id, 0.0 wa, 0.0 hi, 2.3 si, 0.0 st KiB Mem : 26359952+total, 10287185+free, 79023616 used, 81704048 buff/cache KiB Swap: 0 total, 0 free, 0 used. 17905331+avail Mem PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 35309 work 20 0 27.3g 10.6g 11532 S 71.6 4.2 8159:47 G1 Conc#5 35306 work 20 0 27.3g 10.6g 11532 S 69.3 4.2 8159:23 G1 Conc#2 35308 work 20 0 27.3g 10.6g 11532 S 69.3 4.2 8160:05 G1 Conc#4 35307 work 20 0 27.3g 10.6g 11532 S 69.0 4.2 8160:03 G1 Conc#3 35257 work 20 0 27.3g 10.6g 11532 S 68.3 4.2 8160:12 G1 Conc#0 35305 work 20 0 27.3g 10.6g 11532 S 68.3 4.2 8159:48 G1 Conc#1 35375 work 20 0 27.3g 10.6g 11532 S 13.9 4.2 589:09.39 http-nio-0.0.0. 35469 work 20 0 27.3g 10.6g 11532 S 7.9 4.2 29171:28 http-nio-8442-P 35470 work 20 0 27.3g 10.6g 11532 S 6.3 4.2 27653:44 http-nio-8442-A 189160 work 20 0 27.3g 10.6g 11532 R 6.3 4.2 587:47.64 http-nio-0.0.0. 35457 work 20 0 27.3g 10.6g 11532 S 5.0 4.2 17071:54 http-nio-0.0.0. 35458 work 20 0 27.3g 10.6g 11532 S 4.0 4.2 14972:14 http-nio-0.0.0. 11726 work 20 0 27.3g 10.6g 11532 S 2.0 4.2 487:53.72 http-nio-0.0.0. 35348 work 20 0 27.3g 10.6g 11532 S 1.7 4.2 12352:21 pulsar-timer-5- 35288 work 20 0 27.3g 10.6g 11532 S 1.3 4.2 805:44.45 GC Thread#6 35304 work 20 0 27.3g 10.6g 11532 S 1.3 4.2 804:14.37 GC Thread#22 35284 work 20 0 27.3g 10.6g 11532 S 1.0 4.2 806:37.70 GC Thread#2 35285 work 20 0 27.3g 10.6g 11532 S 1.0 4.2 806:05.20 GC Thread#3 35286 work 20 0 27.3g 10.6g 11532 S 1.0 4.2 805:39.92 GC Thread#4 35287 work 20 0 27.3g 10.6g 11532 S 1.0 4.2 804:21.61 GC Thread#5 35290 work 20 0 27.3g 10.6g 11532 S 1.0 4.2 806:57.15 GC Thread#8 35293 work 20 0 27.3g 10.6g 11532 S 1.0 4.2 807:10.16 GC Thread#11 35294 work 20 0 27.3g 10.6g 11532 S 1.0 4.2 804:48.06 GC Thread#12 35297 work 20 0 27.3g 10.6g 11532 S 1.0 4.2 806:14.76 GC Thread#15 35299 work 20 0 27.3g 10.6g 11532 S 1.0 4.2 806:53.58 GC Thread#17 </syntaxhighlight> == ps == Use ps: <syntaxhighlight lang="bash"> $ ps -ef | grep java work 33196 1 99 2023 ? 533-03:00:51 /home/work/dynamic-raft/jdk-11/bin/java -Xms8192m -Xmx8192m -Dspring.profiles.active=prod-x9 -Dserver.port=8081 -Dserver.httpsPort=8441 -Draft.id=10.19.24.7-6001 -Dmanagement.server.port=9441 -jar dynamic-service-1.1.1.jar work 35253 1 99 2023 ? 552-06:53:20 /home/work/dynamic-raft/jdk-11/bin/java -Xms8192m -Xmx8192m -Dspring.profiles.active=prod-x9 -Dserver.port=8082 -Dserver.httpsPort=8442 -Draft.id=10.19.24.7-6002 -Dmanagement.server.port=9442 -jar dynamic-service-1.1.1.jar ... </syntaxhighlight> Or use jps: <syntaxhighlight lang="bash"> $ jps 35253 jar 38200 jar 201882 Jps 38489 jar 33196 jar 38110 jar </syntaxhighlight> <source lang="bash"> $ ps -mp 35253 -o THREAD,tid,time | sort -rn work 5.7 19 - ep_pol - - 35469 20-06:12:44 work 5.4 19 - - - - 35470 19-04:54:46 work 3.3 19 - ep_pol - - 35457 11-20:32:40 work 2.9 19 - inet_c - - 35458 10-09:32:49 work 2.4 19 - futex_ - - 35348 8-13:52:37 work 155 - - - - - - 552-07:28:01 work 1.5 19 - futex_ - - 35309 5-16:02:00 work 1.5 19 - futex_ - - 35308 5-16:02:18 work 1.5 19 - futex_ - - 35307 5-16:02:17 work 1.5 19 - futex_ - - 35306 5-16:01:36 work 1.5 19 - futex_ - - 35305 5-16:02:02 work 1.5 19 - futex_ - - 35257 5-16:02:24 work 0.4 19 - futex_ - - 90755 1-07:46:12 work 0.4 19 - futex_ - - 73007 1-10:15:56 work 0.4 19 - futex_ - - 73006 1-10:16:16 work 0.4 19 - futex_ - - 73005 1-10:16:29 work 0.4 19 - futex_ - - 73004 1-10:14:13 work 0.4 19 - futex_ - - 73003 1-10:15:21 work 0.4 19 - futex_ - - 72981 1-10:17:19 work 0.4 19 - futex_ - - 72980 1-10:17:15 work 0.4 19 - futex_ - - 72974 1-10:18:23 </source> = Memory & GC analysis = == JMap: View memory layout == <syntaxhighlight lang="bash"> $ jmap -histo:live 35253| head -n 10 num #instances #bytes class name (module) ------------------------------------------------------- 1: 38351692 1298970832 [B (java.base@11) 2: 37661022 903864528 java.lang.String (java.base@11) 3: 17207496 412979904 com.kingsoft.dw.dynamic.domain.dwevent.EventProperty 4: 3431252 221917408 [Ljava.lang.Object; (java.base@11) 5: 2207352 207421824 [Ljava.util.HashMap$Node; (java.base@11) 6: 5579222 133901328 java.lang.Long (java.base@11) 7: 2220304 124337024 java.util.LinkedHashMap (java.base@11) 8: 5670892 90734272 java.lang.Integer (java.base@11) </syntaxhighlight> 其中： #[C is a char[] #[S is a short[] #[I is a int[] #[B is a byte[] #[[I is a int[][] == jstat: View GC status == <syntaxhighlight lang="bash"> $ jstat -gcutil 35253 1000 S0 S1 E O M CCS YGC YGCT FGC FGCT GCT 0.00 100.00 13.98 78.28 97.30 91.11 595624 22540.714 3 5.341 22546.055 0.00 100.00 18.64 78.28 97.30 91.11 595624 22540.714 3 5.341 22546.055 0.00 100.00 8.98 78.88 97.30 91.11 595625 22540.837 3 5.341 22546.177 0.00 100.00 12.99 78.79 97.30 91.11 595625 22540.837 3 5.341 22546.177 0.00 100.00 17.63 78.79 97.30 91.11 595625 22540.837 3 5.341 22546.177 0.00 100.00 22.70 78.79 97.30 91.11 595625 22540.837 3 5.341 22546.177 0.00 100.00 35.69 78.79 97.30 91.11 595625 22540.837 3 5.341 22546.177 0.00 100.00 95.04 78.79 97.30 91.11 595626 22540.837 3 5.341 22546.177 0.00 100.00 5.90 71.19 97.30 91.11 595627 22541.470 3 5.341 22546.811 0.00 100.00 19.78 71.19 97.30 91.11 595627 22541.470 3 5.341 22546.811 0.00 100.00 59.97 70.23 97.30 91.11 595627 22541.470 3 5.341 22546.811 0.00 100.00 21.34 71.44 97.30 91.11 595628 22541.658 3 5.341 22546.998 0.00 100.00 39.07 71.37 97.30 91.11 595628 22541.658 3 5.341 22546.998 </syntaxhighlight> === jstack：view thread detail == <syntaxhighlight lang="bash"> $ top -Hp 35253 203384 work 20 0 27.3g 10.6g 11560 S 16.7 4.2 583:47.11 http-nio-0.0.0. $ printf "%x\n" 203384 31a78 $ jstack 35253 | grep 31a78 -A 100 "http-nio-0.0.0.0-8082-exec-259" #647 daemon prio=5 os_prio=0 cpu=35027157.90ms elapsed=30595411.19s tid=0x00007fe5741c3800 nid=0x31a78 waiting on condition [0x00007fe3eef9f000] java.lang.Thread.State: TIMED_WAITING (parking) at jdk.internal.misc.Unsafe.park(java.base@11/Native Method) - parking to wait for <0x0000000620d00bb8> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.parkNanos(java.base@11/LockSupport.java:234) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(java.base@11/AbstractQueuedSynchronizer.java:2123) at java.util.concurrent.LinkedBlockingQueue.poll(java.base@11/LinkedBlockingQueue.java:458) at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:128) at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:33) at org.apache.tomcat.util.threads.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1113) at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1176) at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(java.base@11/Thread.java:834) "http-nio-0.0.0.0-8082-exec-260" #648 daemon prio=5 os_prio=0 cpu=35198074.52ms elapsed=30595411.19s tid=0x00007fe5741c5800 nid=0x31a7a waiting on condition [0x00007fe3eee9e000] java.lang.Thread.State: TIMED_WAITING (parking) at jdk.internal.misc.Unsafe.park(java.base@11/Native Method) - parking to wait for <0x0000000620d00bb8> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.parkNanos(java.base@11/LockSupport.java:234) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(java.base@11/AbstractQueuedSynchronizer.java:2123) at java.util.concurrent.LinkedBlockingQueue.poll(java.base@11/LinkedBlockingQueue.java:458) at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:128) at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:33) at org.apache.tomcat.util.threads.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1113) at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1176) at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(java.base@11/Thread.java:834) </syntaxhighlight> [[Category:JVM]] [[Category:Linux/Unix]]
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