聊聊jvm的Stack Memory
序
本文主要研究一下jvm的Stack Memory
Virtual Machine Stack
- 每个jvm线程都有一个私有的Virtual Machine Stack，它在线程同时被创建
- 该stack主要用于存储frames，即所谓的stack frames
- 每个方法在执行的时候都会创建一个stack frame，用于存储方法的局部变量、返回值、Operand stack等
Stack Memory
- Stack Memory是执行线程时所使用的内存，他们包含了方法用到的一些短生命周期的values及heap中objects的引用
- Stack Memory是按照LIFO (Last-In-First-Out)的顺序被引用的，每当一个方法被调用，都会在stack memory中创建一块区域用于保存原始类型的值及heap中objects的引用；当方法执行结束时，这块区域就被释放可以被下一个方法使用；相对于heap memory来说，stack memory是非常小的一块。通过-Xss或者-XX:ThreadStackSize可以指定stack memory的大小
- 当一个线程所需的stack size超过了设定的大小是，jvm会抛出StackOverflowError；而当系统没有足够内存可以供jvm创建一个新线程时，jvm会抛出OutOfMemoryError
StackOverflowError实例
/**
* -Xss144k
*/
@Test
public void testStackOverflow(){
recursiveInvoke();
}
public void recursiveInvoke(){
String uuid = UUID.randomUUID().toString();
recursiveInvoke();
}
异常输出如下:
java.lang.StackOverflowError
at java.base/sun.security.provider.ByteArrayAccess.b2iBig64(ByteArrayAccess.java:263)
at java.base/sun.security.provider.SHA.implCompressCheck(SHA.java:139)
at java.base/sun.security.provider.SHA.implCompress(SHA.java:128)
at java.base/sun.security.provider.SHA.implDigest(SHA.java:109)
at java.base/sun.security.provider.DigestBase.engineDigest(DigestBase.java:210)
at java.base/sun.security.provider.DigestBase.engineDigest(DigestBase.java:189)
at java.base/java.security.MessageDigest$Delegate.engineDigest(MessageDigest.java:629)
at java.base/java.security.MessageDigest.digest(MessageDigest.java:385)
at java.base/sun.security.provider.SecureRandom.engineNextBytes(SecureRandom.java:245)
at java.base/sun.security.provider.NativePRNG$RandomIO.implNextBytes(NativePRNG.java:535)
at java.base/sun.security.provider.NativePRNG$NonBlocking.engineNextBytes(NativePRNG.java:318)
at java.base/java.security.SecureRandom.nextBytes(SecureRandom.java:741)
at java.base/java.util.UUID.randomUUID(UUID.java:150)
at com.example.VMStackTest.recursiveInvoke(VMStackTest.java:21)
Xss越大，每个线程的大小就越大，占用的内存越多，能创建的线程就越少；Xss越小，则递归的深度越小，容易出现栈溢出 java.lang.StackOverflowError。减少局部变量的声明，可以节省栈帧大小，增加调用深度。
OOMKilled实例
- 代码实例
public void createThreadAsManyAsPossible(){
try{
while (true) {
new Thread(new Runnable() {
public void run() {
try {
TimeUnit.HOURS.sleep(1);
} catch (InterruptedException e) {
}
}
}).start();
}
}catch (Throwable e){
LOGGER.error(e.getMessage(),e);
}
}
- docker命令启动
docker run -v /tmp:/tmp --memory=256m -p 8080:8080 / -e JAVA_OPTS='-server -Xmx128m -Xss1m -XX:ParallelGCThreads=4 -XX:ConcGCThreads=4 -XX:+UnlockDiagnosticVMOptions -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/tmp' / -e PROFILE='default' / demo
- docker inspect containerId
[
{
"Id": "93ec46e93290f8dc70901680c251dd9faef4a5a283cb6020ec8640fed4001026",
"Created": "2019-04-01T02:22:41.007466012Z",
//......
"State": {
"Status": "exited",
"Running": false,
"Paused": false,
"Restarting": false,
"OOMKilled": true,
"Dead": false,
"Pid": 0,
"ExitCode": 137,
"Error": "",
"StartedAt": "2019-04-01T02:22:41.284627718Z",
"FinishedAt": "2019-04-01T02:22:59.192763475Z"
},
"Image": "sha256:bbaf9474dd259b8c6afe39cbbccce62bb695b52fda79d8ce3a727be89fcef5c6",
//......
]
可以看到State里头的OOMKilled为true
OutOfMemoryError实例
- 代码实例
public void createThreadAsManyAsPossible(){
try{
while (true) {
new Thread(new Runnable() {
public void run() {
try {
TimeUnit.HOURS.sleep(1);
} catch (InterruptedException e) {
}
}
}).start();
}
}catch (Throwable e){
LOGGER.error(e.getMessage(),e);
}
}
- 运行参数
-server -Xmx128m -Xss1m -XX:ParallelGCThreads=4 -XX:ConcGCThreads=4 -XX:+UnlockDiagnosticVMOptions -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/tmp -Djava.io.tmpdir=/tmp
不使用docker，直接在本机执行，可以看到如下报错
- 异常输出
java.lang.OutOfMemoryError: unable to create native thread: possibly out of memory or process/resource limits reached
at java.base/java.lang.Thread.start0(Native Method) ~[na:na]
at java.base/java.lang.Thread.start(Thread.java:804) ~[na:na]
查看thread信息
查看thread stack size
/ # jcmd 1 VM.native_memory scale=MB
1:
Native Memory Tracking:
Total: reserved=1321MB, committed=204MB
- Java Heap (reserved=128MB, committed=121MB)
(mmap: reserved=128MB, committed=121MB)
- Class (reserved=1065MB, committed=46MB)
(classes #8234)
( instance classes #7694, array classes #540)
(malloc=1MB #19759)
(mmap: reserved=1064MB, committed=44MB)
( Metadata: )
( reserved=40MB, committed=39MB)
( used=38MB)
( free=1MB)
( waste=0MB =0.00%)
( Class space:)
( reserved=1024MB, committed=6MB)
( used=5MB)
( free=0MB)
( waste=0MB =0.00%)
- Thread (reserved=36MB, committed=2MB)
(thread #36)
(stack: reserved=36MB, committed=2MB)
- Code (reserved=65MB, committed=11MB)
(malloc=1MB #4218)
(mmap: reserved=65MB, committed=10MB)
- GC (reserved=9MB, committed=7MB)
(malloc=5MB #6043)
(mmap: reserved=4MB, committed=2MB)
- Internal (reserved=4MB, committed=4MB)
(malloc=2MB #3454)
(mmap: reserved=2MB, committed=2MB)
- Symbol (reserved=10MB, committed=10MB)
(malloc=7MB #220126)
(arena=3MB #1)
- Native Memory Tracking (reserved=4MB, committed=4MB)
(tracking overhead=4MB)
使用jcmd pid VM.native_memory scale=MB可以查看thread stack的信息，具体在Thread部分，这里显示一共有36个线程，stack的reserved大小为36M
查看线程快照
/ # jcmd 1 Thread.print
1:
2019-04-01 10:43:13
Full thread dump OpenJDK 64-Bit Server VM (12+33 mixed mode):
Threads class SMR info:
_java_thread_list=0x0000562b1182fe30, length=28, elements={
0x0000562b0ffa5000, 0x0000562b0ffaa000, 0x0000562b0ffdc000, 0x0000562b0ffde800,
0x0000562b0ffe1000, 0x0000562b1003d800, 0x0000562b1016b000, 0x0000562b1017f800,
0x0000562b1141f800, 0x0000562b10a74000, 0x0000562b10b64000, 0x0000562b10fee800,
0x0000562b125d1000, 0x0000562b1040d800, 0x0000562b11983800, 0x0000562b11982000,
0x0000562b10cc7800, 0x0000562b13630800, 0x0000562b13632000, 0x0000562b136f0800,
0x0000562b136e0800, 0x0000562b136e1800, 0x0000562b13621800, 0x0000562b1360c000,
0x0000562b136cd000, 0x0000562b12115000, 0x0000562b11f9e000, 0x0000562b11ff8800
}
"Reference Handler" #2 daemon prio=10 os_prio=0 cpu=2.69ms elapsed=31.15s tid=0x0000562b0ffa5000 nid=0xb waiting on condition [0x00007f5cbb576000]
java.lang.Thread.State: RUNNABLE
at java.lang.ref.Reference.waitForReferencePendingList(java.base@12/Native Method)
at java.lang.ref.Reference.processPendingReferences(java.base@12/Reference.java:241)
at java.lang.ref.Reference$ReferenceHandler.run(java.base@12/Reference.java:213)
"Finalizer" #3 daemon prio=8 os_prio=0 cpu=0.25ms elapsed=31.15s tid=0x0000562b0ffaa000 nid=0xc in Object.wait() [0x00007f5cbb475000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(java.base@12/Native Method)
- waiting on <0x00000000f800a840> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(java.base@12/ReferenceQueue.java:155)
- locked <0x00000000f800a840> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(java.base@12/ReferenceQueue.java:176)
at java.lang.ref.Finalizer$FinalizerThread.run(java.base@12/Finalizer.java:170)
"Signal Dispatcher" #4 daemon prio=9 os_prio=0 cpu=0.79ms elapsed=31.14s tid=0x0000562b0ffdc000 nid=0xd runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"C2 CompilerThread0" #5 daemon prio=9 os_prio=0 cpu=4680.36ms elapsed=31.14s tid=0x0000562b0ffde800 nid=0xe waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
No compile task
"C1 CompilerThread0" #6 daemon prio=9 os_prio=0 cpu=2329.95ms elapsed=31.14s tid=0x0000562b0ffe1000 nid=0xf waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
No compile task
"Sweeper thread" #7 daemon prio=9 os_prio=0 cpu=71.45ms elapsed=31.13s tid=0x0000562b1003d800 nid=0x10 runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"Service Thread" #8 daemon prio=9 os_prio=0 cpu=47.53ms elapsed=31.06s tid=0x0000562b1016b000 nid=0x11 runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"Common-Cleaner" #9 daemon prio=8 os_prio=0 cpu=3.92ms elapsed=31.05s tid=0x0000562b1017f800 nid=0x13 in Object.wait() [0x00007f5cbad6c000]
java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(java.base@12/Native Method)
- waiting on <0x00000000f80c1880> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(java.base@12/ReferenceQueue.java:155)
- locked <0x00000000f80c1880> (a java.lang.ref.ReferenceQueue$Lock)
at jdk.internal.ref.CleanerImpl.run(java.base@12/CleanerImpl.java:148)
at java.lang.Thread.run(java.base@12/Thread.java:835)
at jdk.internal.misc.InnocuousThread.run(java.base@12/InnocuousThread.java:134)
"Catalina-utility-1" #13 prio=1 os_prio=0 cpu=9.33ms elapsed=19.61s tid=0x0000562b1141f800 nid=0x19 waiting on condition [0x00007f5cb93ac000]
java.lang.Thread.State: WAITING (parking)
at jdk.internal.misc.Unsafe.park(java.base@12/Native Method)
- parking to wait for <0x00000000ffac03b8> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(java.base@12/LockSupport.java:194)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(java.base@12/AbstractQueuedSynchronizer.java:2081)
at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(java.base@12/ScheduledThreadPoolExecutor.java:1177)
at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(java.base@12/ScheduledThreadPoolExecutor.java:899)
at java.util.concurrent.ThreadPoolExecutor.getTask(java.base@12/ThreadPoolExecutor.java:1054)
at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@12/ThreadPoolExecutor.java:1114)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@12/ThreadPoolExecutor.java:628)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(java.base@12/Thread.java:835)
"Catalina-utility-2" #14 prio=1 os_prio=0 cpu=2.97ms elapsed=19.61s tid=0x0000562b10a74000 nid=0x1a waiting on condition [0x00007f5cb827d000]
java.lang.Thread.State: TIMED_WAITING (parking)
at jdk.internal.misc.Unsafe.park(java.base@12/Native Method)
- parking to wait for <0x00000000ffac03b8> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.parkNanos(java.base@12/LockSupport.java:235)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(java.base@12/AbstractQueuedSynchronizer.java:2123)
at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(java.base@12/ScheduledThreadPoolExecutor.java:1182)
at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(java.base@12/ScheduledThreadPoolExecutor.java:899)
at java.util.concurrent.ThreadPoolExecutor.getTask(java.base@12/ThreadPoolExecutor.java:1054)
at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@12/ThreadPoolExecutor.java:1114)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@12/ThreadPoolExecutor.java:628)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(java.base@12/Thread.java:835)
"container-0" #15 prio=5 os_prio=0 cpu=0.16ms elapsed=19.60s tid=0x0000562b10b64000 nid=0x1b waiting on condition [0x00007f5cb817c000]
java.lang.Thread.State: TIMED_WAITING (sleeping)
at java.lang.Thread.sleep(java.base@12/Native Method)
at org.apache.catalina.core.StandardServer.await(StandardServer.java:568)
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer$1.run(TomcatWebServer.java:181)
"Thread-1" #16 daemon prio=9 os_prio=0 cpu=0.26ms elapsed=19.38s tid=0x0000562b10fee800 nid=0x1c waiting on condition [0x00007f5cb7f25000]
java.lang.Thread.State: WAITING (parking)
at jdk.internal.misc.Unsafe.park(java.base@12/Native Method)
- parking to wait for <0x00000000fe2f54f0> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(java.base@12/LockSupport.java:194)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(java.base@12/AbstractQueuedSynchronizer.java:2081)
at java.util.concurrent.LinkedBlockingQueue.take(java.base@12/LinkedBlockingQueue.java:433)
at org.LatencyUtils.PauseDetector$PauseDetectorThread.run(PauseDetector.java:85)
"SimplePauseDetectorThread_0" #17 daemon prio=9 os_prio=0 cpu=20.21ms elapsed=19.37s tid=0x0000562b125d1000 nid=0x1d waiting on condition [0x00007f5cb7e24000]
java.lang.Thread.State: TIMED_WAITING (sleeping)
at java.lang.Thread.sleep(java.base@12/Native Method)
at java.lang.Thread.sleep(java.base@12/Thread.java:340)
at java.util.concurrent.TimeUnit.sleep(java.base@12/TimeUnit.java:446)
at org.LatencyUtils.TimeServices.sleepNanos(TimeServices.java:62)
at org.LatencyUtils.SimplePauseDetector$SimplePauseDetectorThread.run(SimplePauseDetector.java:116)
"NioBlockingSelector.BlockPoller-1" #18 daemon prio=5 os_prio=0 cpu=2.27ms elapsed=17.43s tid=0x0000562b1040d800 nid=0x23 runnable [0x00007f5cba443000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPoll.wait(java.base@12/Native Method)
at sun.nio.ch.EPollSelectorImpl.doSelect(java.base@12/EPollSelectorImpl.java:120)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(java.base@12/SelectorImpl.java:124)
- locked <0x00000000fb4b21c0> (a sun.nio.ch.Util$2)
- locked <0x00000000fb4b1dc8> (a sun.nio.ch.EPollSelectorImpl)
at sun.nio.ch.SelectorImpl.select(java.base@12/SelectorImpl.java:136)
at org.apache.tomcat.util.net.NioBlockingSelector$BlockPoller.run(NioBlockingSelector.java:304)
"http-nio-8080-exec-1" #19 daemon prio=5 os_prio=0 cpu=0.13ms elapsed=17.42s tid=0x0000562b11983800 nid=0x24 waiting on condition [0x00007f5cb7d23000]
java.lang.Thread.State: WAITING (parking)
at jdk.internal.misc.Unsafe.park(java.base@12/Native Method)
- parking to wait for <0x00000000fb50ba60> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(java.base@12/LockSupport.java:194)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(java.base@12/AbstractQueuedSynchronizer.java:2081)
at java.util.concurrent.LinkedBlockingQueue.take(java.base@12/LinkedBlockingQueue.java:433)
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(java.base@12/ThreadPoolExecutor.java:1054)
at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@12/ThreadPoolExecutor.java:1114)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@12/ThreadPoolExecutor.java:628)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(java.base@12/Thread.java:835)
"http-nio-8080-exec-2" #20 daemon prio=5 os_prio=0 cpu=0.09ms elapsed=17.42s tid=0x0000562b11982000 nid=0x25 waiting on condition [0x00007f5cb807b000]
java.lang.Thread.State: WAITING (parking)
at jdk.internal.misc.Unsafe.park(java.base@12/Native Method)
- parking to wait for <0x00000000fb50ba60> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(java.base@12/LockSupport.java:194)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(java.base@12/AbstractQueuedSynchronizer.java:2081)
at java.util.concurrent.LinkedBlockingQueue.take(java.base@12/LinkedBlockingQueue.java:433)
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(java.base@12/ThreadPoolExecutor.java:1054)
at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@12/ThreadPoolExecutor.java:1114)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@12/ThreadPoolExecutor.java:628)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(java.base@12/Thread.java:835)
"http-nio-8080-exec-3" #21 daemon prio=5 os_prio=0 cpu=0.35ms elapsed=17.42s tid=0x0000562b10cc7800 nid=0x26 waiting on condition [0x00007f5cb77e5000]
java.lang.Thread.State: WAITING (parking)
at jdk.internal.misc.Unsafe.park(java.base@12/Native Method)
- parking to wait for <0x00000000fb50ba60> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(java.base@12/LockSupport.java:194)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(java.base@12/AbstractQueuedSynchronizer.java:2081)
at java.util.concurrent.LinkedBlockingQueue.take(java.base@12/LinkedBlockingQueue.java:433)
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(java.base@12/ThreadPoolExecutor.java:1054)
at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@12/ThreadPoolExecutor.java:1114)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@12/ThreadPoolExecutor.java:628)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(java.base@12/Thread.java:835)
"http-nio-8080-exec-4" #22 daemon prio=5 os_prio=0 cpu=0.10ms elapsed=17.42s tid=0x0000562b13630800 nid=0x27 waiting on condition [0x00007f5cb75ff000]
java.lang.Thread.State: WAITING (parking)
at jdk.internal.misc.Unsafe.park(java.base@12/Native Method)
- parking to wait for <0x00000000fb50ba60> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(java.base@12/LockSupport.java:194)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(java.base@12/AbstractQueuedSynchronizer.java:2081)
at java.util.concurrent.LinkedBlockingQueue.take(java.base@12/LinkedBlockingQueue.java:433)
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(java.base@12/ThreadPoolExecutor.java:1054)
at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@12/ThreadPoolExecutor.java:1114)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@12/ThreadPoolExecutor.java:628)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(java.base@12/Thread.java:835)
"http-nio-8080-exec-5" #23 daemon prio=5 os_prio=0 cpu=0.06ms elapsed=17.41s tid=0x0000562b13632000 nid=0x28 waiting on condition [0x00007f5cb74fe000]
java.lang.Thread.State: WAITING (parking)
at jdk.internal.misc.Unsafe.park(java.base@12/Native Method)
- parking to wait for <0x00000000fb50ba60> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(java.base@12/LockSupport.java:194)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(java.base@12/AbstractQueuedSynchronizer.java:2081)
at java.util.concurrent.LinkedBlockingQueue.take(java.base@12/LinkedBlockingQueue.java:433)
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(java.base@12/ThreadPoolExecutor.java:1054)
at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@12/ThreadPoolExecutor.java:1114)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@12/ThreadPoolExecutor.java:628)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(java.base@12/Thread.java:835)
"http-nio-8080-exec-6" #24 daemon prio=5 os_prio=0 cpu=0.14ms elapsed=17.41s tid=0x0000562b136f0800 nid=0x29 waiting on condition [0x00007f5cb73fd000]
java.lang.Thread.State: WAITING (parking)
at jdk.internal.misc.Unsafe.park(java.base@12/Native Method)
- parking to wait for <0x00000000fb50ba60> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(java.base@12/LockSupport.java:194)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(java.base@12/AbstractQueuedSynchronizer.java:2081)
at java.util.concurrent.LinkedBlockingQueue.take(java.base@12/LinkedBlockingQueue.java:433)
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(java.base@12/ThreadPoolExecutor.java:1054)
at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@12/ThreadPoolExecutor.java:1114)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@12/ThreadPoolExecutor.java:628)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(java.base@12/Thread.java:835)
"http-nio-8080-exec-7" #25 daemon prio=5 os_prio=0 cpu=0.12ms elapsed=17.41s tid=0x0000562b136e0800 nid=0x2a waiting on condition [0x00007f5cb72fc000]
java.lang.Thread.State: WAITING (parking)
at jdk.internal.misc.Unsafe.park(java.base@12/Native Method)
- parking to wait for <0x00000000fb50ba60> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(java.base@12/LockSupport.java:194)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(java.base@12/AbstractQueuedSynchronizer.java:2081)
at java.util.concurrent.LinkedBlockingQueue.take(java.base@12/LinkedBlockingQueue.java:433)
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(java.base@12/ThreadPoolExecutor.java:1054)
at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@12/ThreadPoolExecutor.java:1114)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@12/ThreadPoolExecutor.java:628)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(java.base@12/Thread.java:835)
"http-nio-8080-exec-8" #26 daemon prio=5 os_prio=0 cpu=0.09ms elapsed=17.41s tid=0x0000562b136e1800 nid=0x2b waiting on condition [0x00007f5cb71fb000]
java.lang.Thread.State: WAITING (parking)
at jdk.internal.misc.Unsafe.park(java.base@12/Native Method)
- parking to wait for <0x00000000fb50ba60> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(java.base@12/LockSupport.java:194)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(java.base@12/AbstractQueuedSynchronizer.java:2081)
at java.util.concurrent.LinkedBlockingQueue.take(java.base@12/LinkedBlockingQueue.java:433)
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(java.base@12/ThreadPoolExecutor.java:1054)
at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@12/ThreadPoolExecutor.java:1114)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@12/ThreadPoolExecutor.java:628)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(java.base@12/Thread.java:835)
"http-nio-8080-exec-9" #27 daemon prio=5 os_prio=0 cpu=0.14ms elapsed=17.41s tid=0x0000562b13621800 nid=0x2c waiting on condition [0x00007f5cb70fa000]
java.lang.Thread.State: WAITING (parking)
at jdk.internal.misc.Unsafe.park(java.base@12/Native Method)
- parking to wait for <0x00000000fb50ba60> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(java.base@12/LockSupport.java:194)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(java.base@12/AbstractQueuedSynchronizer.java:2081)
at java.util.concurrent.LinkedBlockingQueue.take(java.base@12/LinkedBlockingQueue.java:433)
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(java.base@12/ThreadPoolExecutor.java:1054)
at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@12/ThreadPoolExecutor.java:1114)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@12/ThreadPoolExecutor.java:628)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(java.base@12/Thread.java:835)
"http-nio-8080-exec-10" #28 daemon prio=5 os_prio=0 cpu=0.14ms elapsed=17.41s tid=0x0000562b1360c000 nid=0x2d waiting on condition [0x00007f5cb6ff9000]
java.lang.Thread.State: WAITING (parking)
at jdk.internal.misc.Unsafe.park(java.base@12/Native Method)
- parking to wait for <0x00000000fb50ba60> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(java.base@12/LockSupport.java:194)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(java.base@12/AbstractQueuedSynchronizer.java:2081)
at java.util.concurrent.LinkedBlockingQueue.take(java.base@12/LinkedBlockingQueue.java:433)
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(java.base@12/ThreadPoolExecutor.java:1054)
at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@12/ThreadPoolExecutor.java:1114)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@12/ThreadPoolExecutor.java:628)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(java.base@12/Thread.java:835)
"http-nio-8080-ClientPoller-0" #29 daemon prio=5 os_prio=0 cpu=2.85ms elapsed=17.40s tid=0x0000562b136cd000 nid=0x2e runnable [0x00007f5cb6ef8000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPoll.wait(java.base@12/Native Method)
at sun.nio.ch.EPollSelectorImpl.doSelect(java.base@12/EPollSelectorImpl.java:120)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(java.base@12/SelectorImpl.java:124)
- locked <0x00000000fb53c5f8> (a sun.nio.ch.Util$2)
- locked <0x00000000fb53c460> (a sun.nio.ch.EPollSelectorImpl)
at sun.nio.ch.SelectorImpl.select(java.base@12/SelectorImpl.java:136)
at org.apache.tomcat.util.net.NioEndpoint$Poller.run(NioEndpoint.java:743)
at java.lang.Thread.run(java.base@12/Thread.java:835)
"http-nio-8080-Acceptor-0" #30 daemon prio=5 os_prio=0 cpu=0.45ms elapsed=17.40s tid=0x0000562b12115000 nid=0x2f runnable [0x00007f5cb6df7000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.ServerSocketChannelImpl.accept0(java.base@12/Native Method)
at sun.nio.ch.ServerSocketChannelImpl.accept(java.base@12/ServerSocketChannelImpl.java:525)
at sun.nio.ch.ServerSocketChannelImpl.accept(java.base@12/ServerSocketChannelImpl.java:277)
at org.apache.tomcat.util.net.NioEndpoint.serverSocketAccept(NioEndpoint.java:448)
at org.apache.tomcat.util.net.NioEndpoint.serverSocketAccept(NioEndpoint.java:70)
at org.apache.tomcat.util.net.Acceptor.run(Acceptor.java:95)
at java.lang.Thread.run(java.base@12/Thread.java:835)
"DestroyJavaVM" #32 prio=5 os_prio=0 cpu=4915.44ms elapsed=17.32s tid=0x0000562b11f9e000 nid=0x6 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"Attach Listener" #33 daemon prio=9 os_prio=0 cpu=0.60ms elapsed=15.49s tid=0x0000562b11ff8800 nid=0x3c waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"VM Thread" os_prio=0 cpu=170.49ms elapsed=31.16s tid=0x0000562b0ff90000 nid=0xa runnable
"Shenandoah GC Threads#0" os_prio=0 cpu=57.15ms elapsed=31.46s tid=0x0000562b0fe25800 nid=0x7 runnable
"Shenandoah GC Threads#1" os_prio=0 cpu=40.46ms elapsed=29.33s tid=0x0000562b111b0000 nid=0x15 runnable
"Shenandoah GC Threads#2" os_prio=0 cpu=56.93ms elapsed=29.32s tid=0x0000562b111ae000 nid=0x16 runnable
"Shenandoah GC Threads#3" os_prio=0 cpu=47.89ms elapsed=29.30s tid=0x0000562b11562800 nid=0x17 runnable
"VM Periodic Task Thread" os_prio=0 cpu=59.59ms elapsed=31.06s tid=0x0000562b1016e000 nid=0x12 waiting on condition
JNI global refs: 14, weak refs: 0
使用jcmd pid Thread.print可以打印线程快照
查看spring boot运行线程信息
/ # curl -i localhost:8080/actuator/metrics/jvm.threads.daemon
HTTP/1.1 200
Content-Disposition: inline;filename=f.txt
Content-Type: application/vnd.spring-boot.actuator.v2+json;charset=UTF-8
Transfer-Encoding: chunked
Date: Mon, 01 Apr 2019 02:49:19 GMT
{"name":"jvm.threads.daemon","description":"The current number of live daemon threads","baseUnit":"threads","measurements":[{"statistic":"VALUE","value":20.0}],"availableTags":[]}
/ # curl -i localhost:8080/actuator/metrics/jvm.threads.peak
HTTP/1.1 200
Content-Disposition: inline;filename=f.txt
Content-Type: application/vnd.spring-boot.actuator.v2+json;charset=UTF-8
Transfer-Encoding: chunked
Date: Mon, 01 Apr 2019 02:47:32 GMT
{"name":"jvm.threads.peak","description":"The peak live thread count since the Java virtual machine started or peak was reset","baseUnit":"threads","measurements":[{"statistic":"VALUE","value":24.0}],"availableTags":[]}
/ # curl -i localhost:8080/actuator/metrics/jvm.threads.live
HTTP/1.1 200
Content-Disposition: inline;filename=f.txt
Content-Type: application/vnd.spring-boot.actuator.v2+json;charset=UTF-8
Transfer-Encoding: chunked
Date: Mon, 01 Apr 2019 02:47:52 GMT
{"name":"jvm.threads.live","description":"The current number of live threads including both daemon and non-daemon threads","baseUnit":"threads","measurements":[{"statistic":"VALUE","value":24.0}],"availableTags":[]}
/ # curl -i localhost:8080/actuator/metrics/tomcat.threads.current
HTTP/1.1 200
Content-Disposition: inline;filename=f.txt
Content-Type: application/vnd.spring-boot.actuator.v2+json;charset=UTF-8
Transfer-Encoding: chunked
Date: Mon, 01 Apr 2019 02:48:31 GMT
{"name":"tomcat.threads.current","description":null,"baseUnit":"threads","measurements":[{"statistic":"VALUE","value":10.0}],"availableTags":[{"tag":"name","values":["http-nio-8080"]}]}
/ # curl -i localhost:8080/actuator/metrics/tomcat.threads.busy
HTTP/1.1 200
Content-Disposition: inline;filename=f.txt
Content-Type: application/vnd.spring-boot.actuator.v2+json;charset=UTF-8
Transfer-Encoding: chunked
Date: Mon, 01 Apr 2019 02:48:58 GMT
{"name":"tomcat.threads.busy","description":null,"baseUnit":"threads","measurements":[{"statistic":"VALUE","value":1.0}],"availableTags":[{"tag":"name","values":["http-nio-8080"]}]}
/ # curl -i localhost:8080/actuator/metrics/tomcat.threads.config.max
HTTP/1.1 200
Content-Disposition: inline;filename=f.txt
Content-Type: application/vnd.spring-boot.actuator.v2+json;charset=UTF-8
Transfer-Encoding: chunked
Date: Mon, 01 Apr 2019 02:50:15 GMT
{"name":"tomcat.threads.config.max","description":null,"baseUnit":"threads","measurements":[{"statistic":"VALUE","value":200.0}],"availableTags":[{"tag":"name","values":["http-nio-8080"]}]}
springboot的actuator默认可以查看jvm.threads开头( jvm.threads.daemon、jvm.threads.peak、jvm.threads.live
)以及tomcat.threads开头( tomcat.threads.current、tomcat.threads.busy、tomcat.threads.config.max
)的metrics；另外使用/actuator/threaddump也可以打印线程快照；不过actuator的metrics没有统计也没有dump出来gc等其他线程，比如C2 CompilerThread0、C1 CompilerThread0、Sweeper thread、Service Thread、VM Thread、Shenandoah GC Threads#0、Shenandoah GC Threads#1、Shenandoah GC Threads#2、Shenandoah GC Threads#3、VM Periodic Task Thread等
小结
- 每个jvm线程都有一个私有的Virtual Machine Stack，它在线程同时被创建；该stack主要用于存储frames，即所谓的stack frames；每个方法在执行的时候都会创建一个stack frame，用于存储方法的局部变量、返回值、Operand stack等
- Stack Memory是执行线程时所使用的内存，他们包含了方法用到的一些短生命周期的values及heap中objects的引用；Stack Memory是按照LIFO (Last-In-First-Out)的顺序被引用的，每当一个方法被调用，都会在stack memory中创建一块区域用于保存原始类型的值及heap中objects的引用；当方法执行结束时，这块区域就被释放可以被下一个方法使用；相对于heap memory来说，stack memory是非常小的一块。通过-Xss或者-XX:ThreadStackSize可以指定stack memory的大小；当一个线程所需的stack size超过了设定的大小是，jvm会抛出StackOverflowError；而当系统没有足够内存可以供jvm创建一个新线程时，jvm会抛出OutOfMemoryError
-
查询线程信息
- 使用jcmd pid VM.native_memory scale=MB可以查看thread stack的信息，具体在Thread部分
- 使用jcmd pid Thread.print可以打印线程快照
-
springboot的actuator默认可以查看jvm.threads开头(
jvm.threads.daemon、jvm.threads.peak、jvm.threads.live)以及tomcat.threads开头(tomcat.threads.current、tomcat.threads.busy、tomcat.threads.config.max)的metrics -
使用/actuator/threaddump也可以打印线程快照(
不过actuator的metrics没有统计也没有dump出来gc等其他线程)
doc
- Java线程与Xss
- 2.5.2. Java Virtual Machine Stacks
- JVMInternals
- JVM memory model
- Java Heap Space vs Stack – Memory Allocation in Java
- How does Java (JVM) allocate stack for each thread
- JVM Stacks and Stack Frames
- A Visual Look at JVM Stacks and Frames
- Stack Memory and Heap Space in Java
- Java: What is the limit to the number of threads you can create?
- Troubleshoot OutOfMemoryError: Unable to Create New Native Thread
- JDK 8: Thread Stack Size Tuning
- JVM Tuning: Heapsize, Stacksize and Garbage Collection Fundamental
正文到此结束
- 本文标签： spring https map Select final http NIO java线程 ip apr DOM 参数 ask executor bus tomcat cat App REST 统计 Service springboot 2019 db 线程 CTO list core Security Spring Boot rand cmd description 代码 value client queue id 递归 web tar NSA Docker example message mmap GMT apache IDE json ThreadPoolExecutor ACE Collection tag java js UI 实例 provider 生命 IO JVM
- 版权声明： 本文为互联网转载文章，出处已在文章中说明(部分除外)。如果侵权，请联系本站长删除，谢谢。
- 本文海报： 生成海报一 生成海报二
热门推荐
相关文章
近期评论
-
文章和留言都翻到11页了 没有OOM
-
-
朋友，翻页到11页，及以后，会出现OOM，无法访问
-
-
搞个gitee的项目
-
-
版本号是多少，你可以下载哪个代码仓库，jdk选1.8 直接跑就行
-
-
-
Loading...
![[HBLOG]公众号](https://www.liuhaihua.cn/img/qrcode_gzh.jpg)
