jvm内存结构查看linux的cpu使用情况和内存使用情况
top和free jdk自带工具
0 jps返回java进程信息1 jstat命令，查看内存2 jmap命令，查看vm内存信息3 jstack命令，查询进程中线程的信息
jvm内存结构方法区、虚拟机栈、本地方法栈、程序计数器、堆区
java8中hotspot虚拟机对方法区的实现是用元空间:元空间并不在虚拟机中，而是使用本地内存，字符串常量池移到堆区
堆区又可以划分为：新生代（伊甸区，from，to）、老年代
top top使用
jdk自带工具 0 jps返回java进程信息jps 返回java进程信息
C:UsersxxxIdeaProjectsctl>jps 16496 Launcher 24976 28576 Jps 30320 HelloWorldMainApplication1 jstat命令，查看内存
jstat动态分析内存信息 jstat -gc pid 250 5
C:UsersxxxIdeaProjectsctl>jstat -gc 30320 250 4 S0C S1C S0U S1U EC EU OC OU MC MU CCSC CCSU YGC YGCT FGC FGCT GCT 10752.0 14848.0 0.0 0.0 163840.0 3794.8 198144.0 21303.6 48128.0 45619.3 6400.0 5951.3 8 0.114 3 0.338 0.452 10752.0 14848.0 0.0 0.0 163840.0 3794.8 198144.0 21303.6 48128.0 45619.3 6400.0 5951.3 8 0.114 3 0.338 0.452 10752.0 14848.0 0.0 0.0 163840.0 3794.8 198144.0 21303.6 48128.0 45619.3 6400.0 5951.3 8 0.114 3 0.338 0.452 10752.0 14848.0 0.0 0.0 163840.0 3794.8 198144.0 21303.6 48128.0 45619.3 6400.0 5951.3 8 0.114 3 0.338 0.4522 jmap命令，查看vm内存信息
jmap 查看vm内存信息
C:UsersxxxIdeaProjectsctl>jmap -heap 30320 Attaching to process ID 30320, please wait... Debugger attached successfully. Server compiler detected. JVM version is 25.151-b12 using thread-local object allocation. Parallel GC with 8 thread(s) Heap Configuration: MinHeapFreeRatio = 0 MaxHeapFreeRatio = 100 MaxHeapSize = 4253024256 (4056.0MB) NewSize = 88604672 (84.5MB) MaxNewSize = 1417674752 (1352.0MB) OldSize = 177733632 (169.5MB) NewRatio = 2 SurvivorRatio = 8 metaspaceSize = 21807104 (20.796875MB) CompressedClassSpaceSize = 1073741824 (1024.0MB) MaxmetaspaceSize = 17592186044415 MB G1HeapRegionSize = 0 (0.0MB) Heap Usage: PS Young Generation Eden Space: capacity = 167772160 (160.0MB) used = 6428048 (6.1302642822265625MB) free = 161344112 (153.86973571777344MB) 3.8314151763916016% used From Space: capacity = 11010048 (10.5MB) used = 0 (0.0MB) free = 11010048 (10.5MB) 0.0% used To Space: capacity = 15204352 (14.5MB) used = 0 (0.0MB) free = 15204352 (14.5MB) 0.0% used PS Old Generation capacity = 202899456 (193.5MB) used = 21814872 (20.804283142089844MB) free = 181084584 (172.69571685791016MB) 10.751567515291908% used3 jstack命令，查询进程中线程的信息
C:UsersxxxIdeaProjectsctl>jstack 30320
2022-03-27 08:30:28
Full thread dump Java HotSpot(TM) 64-Bit Server VM (25.151-b12 mixed mode):
"MessageBroker-4" #38 prio=5 os_prio=0 tid=0x0000000023148800 nid=0x214 waiting on condition [0x0000000000e5e000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000006c349a250> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1088)
at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
"MessageBroker-3" #37 prio=5 os_prio=0 tid=0x000000002314c000 nid=0x67c4 waiting on condition [0x0000000000d5f000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000006c349a250> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1088)
at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
"MessageBroker-2" #36 prio=5 os_prio=0 tid=0x000000002314a000 nid=0x6b0c waiting on condition [0x0000000000f5f000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000006c349a250> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1088)
at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
"DestroyJavaVM" #35 prio=5 os_prio=0 tid=0x0000000023149000 nid=0x6acc waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"http-nio-8081-Acceptor" #33 daemon prio=5 os_prio=0 tid=0x0000000023147000 nid=0x414 runnable [0x00000000291ef000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.ServerSocketChannelImpl.accept0(Native Method)
at sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:422)
at sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:250)
- locked <0x00000006c38a2860> (a java.lang.Object)
at org.apache.tomcat.util.net.NioEndpoint.serverSocketAccept(NioEndpoint.java:463)
at org.apache.tomcat.util.net.NioEndpoint.serverSocketAccept(NioEndpoint.java:73)
at org.apache.tomcat.util.net.Acceptor.run(Acceptor.java:95)
at java.lang.Thread.run(Thread.java:748)
"http-nio-8081-ClientPoller" #32 daemon prio=5 os_prio=0 tid=0x00000000235e3000 nid=0x606c runnable [0x00000000290ee000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll0(Native Method)
at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll(WindowsSelectorImpl.java:296)
at sun.nio.ch.WindowsSelectorImpl$SubSelector.access$400(WindowsSelectorImpl.java:278)
at sun.nio.ch.WindowsSelectorImpl.doSelect(WindowsSelectorImpl.java:159)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
- locked <0x00000006c38a5af8> (a sun.nio.ch.Util$3)
- locked <0x00000006c38a5ae8> (a java.util.Collections$UnmodifiableSet)
- locked <0x00000006c38a5a68> (a sun.nio.ch.WindowsSelectorImpl)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
at org.apache.tomcat.util.net.NioEndpoint$Poller.run(NioEndpoint.java:708)
at java.lang.Thread.run(Thread.java:748)
"http-nio-8081-exec-10" #31 daemon prio=5 os_prio=0 tid=0x00000000235e2800 nid=0x3d28 waiting on condition [0x0000000028fee000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000006c39ab510> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
at java.util.concurrent.linkedBlockingQueue.take(linkedBlockingQueue.java:442)
at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:107)
at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:33)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
"http-nio-8081-exec-9" #30 daemon prio=5 os_prio=0 tid=0x00000000235e1800 nid=0x69d0 waiting on condition [0x0000000028eee000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000006c39ab510> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
at java.util.concurrent.linkedBlockingQueue.take(linkedBlockingQueue.java:442)
at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:107)
at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:33)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
"http-nio-8081-exec-8" #29 daemon prio=5 os_prio=0 tid=0x00000000235e7000 nid=0x7f2c waiting on condition [0x0000000028dee000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000006c39ab510> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
at java.util.concurrent.linkedBlockingQueue.take(linkedBlockingQueue.java:442)
at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:107)
at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:33)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
"http-nio-8081-exec-7" #28 daemon prio=5 os_prio=0 tid=0x00000000235e4000 nid=0x4d00 waiting on condition [0x0000000028cef000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000006c39ab510> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
at java.util.concurrent.linkedBlockingQueue.take(linkedBlockingQueue.java:442)
at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:107)
at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:33)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
"http-nio-8081-exec-6" #27 daemon prio=5 os_prio=0 tid=0x00000000235e6000 nid=0x4638 waiting on condition [0x0000000028bee000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000006c39ab510> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
at java.util.concurrent.linkedBlockingQueue.take(linkedBlockingQueue.java:442)
at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:107)
at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:33)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
"http-nio-8081-exec-5" #26 daemon prio=5 os_prio=0 tid=0x00000000235e5800 nid=0x3a58 waiting on condition [0x0000000028aef000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000006c39ab510> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
at java.util.concurrent.linkedBlockingQueue.take(linkedBlockingQueue.java:442)
at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:107)
at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:33)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
jinfo 查看虚拟机参数
