小編典典

所有這些線程都屬于JVM。

運(yùn)行jstack 以獲取線程列表。

"main" #1 prio=5 os_prio=0 cpu=150.00ms elapsed=8.04s tid=0x00007f9f90011000 nid=0x107 waiting on condition [0x00007f9f99f9f000]

java.lang.Thread.State: TIMED_WAITING (sleeping)

at java.lang.Thread.sleep(java.base@11.0.1/Native Method)

at java.lang.Thread.sleep(java.base@11.0.1/Thread.java:339)

at java.util.concurrent.TimeUnit.sleep(java.base@11.0.1/TimeUnit.java:446)

at com.mycompany.app.Main.main(Main.java:10)

"Reference Handler" #2 daemon prio=10 os_prio=0 cpu=0.00ms elapsed=7.95s tid=0x00007f9f901f9000 nid=0x10e waiting on condition [0x00007f9f6c10f000]

java.lang.Thread.State: RUNNABLE

at java.lang.ref.Reference.waitForReferencePendingList(java.base@11.0.1/Native Method)

at java.lang.ref.Reference.processPendingReferences(java.base@11.0.1/Reference.java:241)

at java.lang.ref.Reference$ReferenceHandler.run(java.base@11.0.1/Reference.java:213)

"Finalizer" #3 daemon prio=8 os_prio=0 cpu=0.00ms elapsed=7.95s tid=0x00007f9f901fd800 nid=0x10f in Object.wait() [0x00007f9f65fef000]

java.lang.Thread.State: WAITING (on object monitor)

at java.lang.Object.wait(java.base@11.0.1/Native Method)

- waiting on <0x0000000712108f80> (a java.lang.ref.ReferenceQueue$Lock)

at java.lang.ref.ReferenceQueue.remove(java.base@11.0.1/ReferenceQueue.java:155)

- waiting to re-lock in wait() <0x0000000712108f80> (a java.lang.ref.ReferenceQueue$Lock)

at java.lang.ref.ReferenceQueue.remove(java.base@11.0.1/ReferenceQueue.java:176)

at java.lang.ref.Finalizer$FinalizerThread.run(java.base@11.0.1/Finalizer.java:170)

"Signal Dispatcher" #4 daemon prio=9 os_prio=0 cpu=0.00ms elapsed=7.93s tid=0x00007f9f90210000 nid=0x110 runnable [0x0000000000000000]

java.lang.Thread.State: RUNNABLE

"C2 CompilerThread0" #5 daemon prio=9 os_prio=0 cpu=40.00ms elapsed=7.93s tid=0x00007f9f90212000 nid=0x111 waiting on condition [0x0000000000000000]

java.lang.Thread.State: RUNNABLE

No compile task

"C1 CompilerThread0" #7 daemon prio=9 os_prio=0 cpu=40.00ms elapsed=7.93s tid=0x00007f9f90214000 nid=0x112 waiting on condition [0x0000000000000000]

java.lang.Thread.State: RUNNABLE

No compile task

"Sweeper thread" #8 daemon prio=9 os_prio=0 cpu=10.00ms elapsed=7.93s tid=0x00007f9f90216000 nid=0x113 runnable [0x0000000000000000]

java.lang.Thread.State: RUNNABLE

"Service Thread" #9 daemon prio=9 os_prio=0 cpu=0.00ms elapsed=7.90s tid=0x00007f9f902d3800 nid=0x114 runnable [0x0000000000000000]

java.lang.Thread.State: RUNNABLE

"Common-Cleaner" #10 daemon prio=8 os_prio=0 cpu=0.00ms elapsed=7.89s tid=0x00007f9f902df800 nid=0x116 in Object.wait() [0x00007f9f656ef000]

java.lang.Thread.State: TIMED_WAITING (on object monitor)

at java.lang.Object.wait(java.base@11.0.1/Native Method)

- waiting on <0x0000000712002df0> (a java.lang.ref.ReferenceQueue$Lock)

at java.lang.ref.ReferenceQueue.remove(java.base@11.0.1/ReferenceQueue.java:155)

- waiting to re-lock in wait() <0x0000000712002df0> (a java.lang.ref.ReferenceQueue$Lock)

at jdk.internal.ref.CleanerImpl.run(java.base@11.0.1/CleanerImpl.java:148)

at java.lang.Thread.run(java.base@11.0.1/Thread.java:834)

at jdk.internal.misc.InnocuousThread.run(java.base@11.0.1/InnocuousThread.java:134)

"Attach Listener" #11 daemon prio=9 os_prio=0 cpu=0.00ms elapsed=0.21s tid=0x00007f9f44001000 nid=0x126 waiting on condition [0x0000000000000000]

java.lang.Thread.State: RUNNABLE

"VM Thread" os_prio=0 cpu=0.00ms elapsed=7.95s tid=0x00007f9f901f1000 nid=0x10d runnable

"GC Thread#0" os_prio=0 cpu=0.00ms elapsed=8.01s tid=0x00007f9f90038800 nid=0x108 runnable

"G1 Main Marker" os_prio=0 cpu=0.00ms elapsed=8.00s tid=0x00007f9f90097800 nid=0x109 runnable

"G1 Conc#0" os_prio=0 cpu=0.00ms elapsed=8.00s tid=0x00007f9f90099800 nid=0x10a runnable

"G1 Refine#0" os_prio=0 cpu=0.00ms elapsed=8.00s tid=0x00007f9f9018d000 nid=0x10b runnable

"G1 Young RemSet Sampling" os_prio=0 cpu=0.00ms elapsed=8.00s tid=0x00007f9f9018f000 nid=0x10c runnable

"VM Periodic Task Thread" os_prio=0 cpu=0.00ms elapsed=7.90s tid=0x00007f9f902d6000 nid=0x115 waiting on condition

這nid是操作系統(tǒng)中線程的十六進(jìn)制ID，您可以將其與的輸出匹配pstree。

第一個(gè)命名main的線程是執(zhí)行代碼的線程。

Reference Handler線程負(fù)責(zé)將垃圾收集器發(fā)現(xiàn)的弱引用，軟引用和幻像引用添加到其注冊(cè)的ReferenceQueues中。

Finalizerfinalize準(zhǔn)備運(yùn)行的對(duì)象的線程運(yùn)行方法。

Signal Dispatcher等待特定的操作系統(tǒng)信號(hào)并處理它們。特別是，它使線程轉(zhuǎn)儲(chǔ)上SIGQUIT，還啟動(dòng)對(duì)VM關(guān)機(jī)過(guò)程SIGTERM，SIGINT和SIGHUP。

CompilerThreads 執(zhí)行字節(jié)碼的JIT編譯。

Sweeper thread 清理過(guò)時(shí)的編譯方法。

Service Thread 運(yùn)行一些后臺(tái)JVM任務(wù)：檢測(cè)內(nèi)存不足情況，清理StringTable和SymbolTable，發(fā)送延遲的JVMTI事件和GC通知等。

Common-Cleaner運(yùn)行java.lang.ref.Cleaner實(shí)例的清理操作。

Attach Listener線程支持動(dòng)態(tài)附加機(jī)制。它偵聽(tīng)傳入的動(dòng)態(tài)附加連接并執(zhí)行VM命令。例如，它是由使用jstack，jmap與jcmd實(shí)用程序。

VM Thread運(yùn)行需要一個(gè)內(nèi)部VM操作還原點(diǎn)。這樣的操作的示例是反優(yōu)化，類(lèi)重新定義，有偏的鎖吊銷(xiāo)，線程轉(zhuǎn)儲(chǔ)，堆檢查等。

G1 線程參與垃圾回收。

VM Periodic Task Thread 用于模擬定時(shí)器中斷。

2020-10-18

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