个人中心
gpt4 book ai didi

java - java GC 是怎么回事？ PermGen 空间快满了？

转载 作者：搜寻专家 更新时间：2023-10-31 19:34:48 25 4
gpt4 key购买 nike

我不知道我的 java 进程发生了什么。这个过程是一个索引过程。它从一组 zip 文件中读取文档，并将它们添加到 lucene 索引中。 GC日志显示只是在持续运行Full GC。 

4959.569: [Full GC 19960K->19960K(10617856K), 0.1648590 secs]
4959.764: [Full GC 19960K->19960K(10617856K), 0.1650240 secs]
4959.959: [Full GC 19960K->19960K(10617856K), 0.1649380 secs]
4960.154: [Full GC 19960K->19960K(10617856K), 0.1650000 secs]
4960.350: [Full GC 19960K->19960K(10617856K), 0.1648900 secs]

据我可以解释这些行，前后对象的大小在 19M 左右，但为什么它一直运行它？

线程转储看起来像这样:

........[Unloading class sun.reflect.GeneratedConstructorAccessor1]
[Unloading class sun.reflect.GeneratedConstructorAccessor2]
[Unloading class sun.reflect.GeneratedConstructorAccessor3]
2012-01-13 12:55:24
Full thread dump Java HotSpot(TM) 64-Bit Server VM (20.4-b02 mixed mode):

"org.cxv.CXVIndexer.main()" prio=10 tid=0x00007f4540474000 nid=0x4b15 waiting on condition [0x00007f453f5ed000]
   java.lang.Thread.State: RUNNABLE
        at org.apache.lucene.index.DocFieldProcessorPerThread.abort(DocFieldProcessorPerThread.java:72)
        at org.apache.lucene.index.DocumentsWriter.abort(DocumentsWriter.java:424)
        - locked <0x000000034ab44fb8> (a org.apache.lucene.index.DocumentsWriter)
        at org.apache.lucene.index.DocumentsWriter.flush(DocumentsWriter.java:659)
        - locked <0x000000034ab44fb8> (a org.apache.lucene.index.DocumentsWriter)
        at org.apache.lucene.index.IndexWriter.doFlush(IndexWriter.java:3623)
        - locked <0x000000034aacf660> (a org.apache.lucene.index.IndexWriter)
        at org.apache.lucene.index.IndexWriter.flush(IndexWriter.java:3588)
        at org.apache.lucene.index.IndexWriter.closeInternal(IndexWriter.java:1858)
        at org.apache.lucene.index.IndexWriter.close(IndexWriter.java:1822)
        at org.cxv.IndexCreator.close(IndexCreator.java:25)
        at org.cxv.CXVIndexer.doIndexing(CXVIndexer.java:41)
        at org.cxv.CXVIndexer.main(CXVIndexer.java:75)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:297)
        at java.lang.Thread.run(Thread.java:662)

"Low Memory Detector" daemon prio=10 tid=0x00007f4540003800 nid=0x4b0a runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"C2 CompilerThread1" daemon prio=10 tid=0x00007f4540001000 nid=0x4b09 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"C2 CompilerThread0" daemon prio=10 tid=0x000000004032d800 nid=0x4b08 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"Signal Dispatcher" daemon prio=10 tid=0x000000004032b800 nid=0x4b07 runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"Surrogate Locker Thread (Concurrent GC)" daemon prio=10 tid=0x0000000040329800 nid=0x4b06 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"Finalizer" daemon prio=10 tid=0x000000004030c800 nid=0x4b05 in Object.wait() [0x00007f453fdfc000]
   java.lang.Thread.State: WAITING (on object monitor)
        at java.lang.Object.wait(Native Method)
        - waiting on <0x000000034a6613a8> (a java.lang.ref.ReferenceQueue$Lock)
        at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:118)
        - locked <0x000000034a6613a8> (a java.lang.ref.ReferenceQueue$Lock)
        at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:134)
        at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159)

"Reference Handler" daemon prio=10 tid=0x0000000040305000 nid=0x4b04 in Object.wait() [0x00007f453fefd000]
   java.lang.Thread.State: WAITING (on object monitor)
        at java.lang.Object.wait(Native Method)
        - waiting on <0x000000034a6627c0> (a java.lang.ref.Reference$Lock)
        at java.lang.Object.wait(Object.java:485)
        at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:116)
        - locked <0x000000034a6627c0> (a java.lang.ref.Reference$Lock)

"main" prio=10 tid=0x0000000040111000 nid=0x4af7 in Object.wait() [0x00007f4563c79000]
   java.lang.Thread.State: WAITING (on object monitor)
        at java.lang.Object.wait(Native Method)
        - waiting on <0x000000034aadf6f8> (a java.lang.Thread)
        at java.lang.Thread.join(Thread.java:1186)
        - locked <0x000000034aadf6f8> (a java.lang.Thread)
        at org.codehaus.mojo.exec.ExecJavaMojo.joinThread(ExecJavaMojo.java:415)
        at org.codehaus.mojo.exec.ExecJavaMojo.joinNonDaemonThreads(ExecJavaMojo.java:405)
        at org.codehaus.mojo.exec.ExecJavaMojo.execute(ExecJavaMojo.java:317)
        at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:107)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
        at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
        at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:319)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
        at org.apache.maven.cli.MavenCli.execute(MavenCli.java:534)
        at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
        at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
        at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)

"VM Thread" prio=10 tid=0x00000000402fe000 nid=0x4b03 runnable 

"Gang worker#0 (Parallel GC Threads)" prio=10 tid=0x0000000040120000 nid=0x4af8 runnable 

"Gang worker#1 (Parallel GC Threads)" prio=10 tid=0x0000000040122000 nid=0x4af9 runnable 

"Gang worker#2 (Parallel GC Threads)" prio=10 tid=0x0000000040123800 nid=0x4afa runnable 

"Gang worker#3 (Parallel GC Threads)" prio=10 tid=0x0000000040125800 nid=0x4afb runnable 

"Gang worker#4 (Parallel GC Threads)" prio=10 tid=0x0000000040127800 nid=0x4afc runnable 

"Gang worker#5 (Parallel GC Threads)" prio=10 tid=0x0000000040129000 nid=0x4afd runnable 

"Gang worker#6 (Parallel GC Threads)" prio=10 tid=0x000000004012b000 nid=0x4afe runnable 

"Gang worker#7 (Parallel GC Threads)" prio=10 tid=0x000000004012d000 nid=0x4aff runnable 

"Concurrent Mark-Sweep GC Thread" prio=10 tid=0x0000000040220800 nid=0x4b02 runnable 
"Gang worker#0 (Parallel CMS Threads)" prio=10 tid=0x000000004021c800 nid=0x4b00 runnable 

"Gang worker#1 (Parallel CMS Threads)" prio=10 tid=0x000000004021e800 nid=0x4b01 runnable 

"VM Periodic Task Thread" prio=10 tid=0x000000004033a000 nid=0x4b0b waiting on condition 

JNI global references: 1154

Heap
 par new generation   total 153344K, used 0K [0x0000000340000000, 0x000000034a660000, 0x000000034a660000)
  eden space 136320K,   0% used [0x0000000340000000, 0x0000000340000000, 0x0000000348520000)
  from space 17024K,   0% used [0x00000003495c0000, 0x00000003495c0000, 0x000000034a660000)
  to   space 17024K,   0% used [0x0000000348520000, 0x0000000348520000, 0x00000003495c0000)
 concurrent mark-sweep generation total 10464512K, used 19960K [0x000000034a660000, 0x00000005c91a0000, 0x0000000780000000)
 concurrent-mark-sweep perm gen total 2097152K, used 2097151K [0x0000000780000000, 0x0000000800000000, 0x0000000800000000)

从线程转储来看，2G perm gen 似乎已满。 perm gen 真的需要那么多空间吗？

最佳答案

如果你的内存是碎片化的，或者没有什么可以清理的，就会发生这种情况。当您接近最大内存大小时，它经常发生。

我从未听说过任何人需要每代大小 2 G。您确定这不是您需要关注的年轻和终身职位吗？

顺便说一句:在 Java 7 中，intern()ed String 被放置在主堆空间中。在 Java 7 之前，它们通常被放置在 perm gen 空间中，这使得将太多数据 interned()

关于java - java GC 是怎么回事？ PermGen 空间快满了？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/8851484/

25 4 0
文章推荐： maven - 错误 : Unable to locate tools. jar 。预计在/usr/lib/jvm/java-6-sun-1.6.0.26/lib/tools.jar中找到
文章推荐： html - Swift HTTP POST 请求登录
文章推荐： swift - 可达性更改通知应仅调用一次
文章推荐： java - 如何制作可以启动和停止的线程之类的东西？
搜寻专家
个人简介

我是一名优秀的程序员,十分优秀！

滴滴打车优惠券免费领取
滴滴打车优惠券
全站热门文章
Copyright 2021 - 2024 cfsdn All Rights Reserved 蜀ICP备2022000587号
广告合作:1813099741@qq.com 6ren.com