jstat结合 jvisualvm.exe(java自带内存分析工具)分析内存泄漏实例
发布日期：2021-07-20 20:53:18
浏览次数：63
分类：技术文章
本文共 15765 字，大约阅读时间需要 52 分钟。
jstat是jdk自带的可以查看堆内存使用量及GC情况的指令.
具体情况请看另一篇博客:
jvisualvm.exe是java的jvm内存/线程监视工具, 位于jdk--bin目录下
以下通过一则简单的内存泄漏案例结合使用两个工具.
内存泄漏代码:
class Key{ Integer id; Key(Integer id){ this.id = id; } public int hashCode(){ return id.hashCode(); } } public void method(){ ...... boolean ss = true; Map map = new HashMap (); while(ss){ for(int i = 0; i< 100000; i++){ if(!map.containsKey(new Key(i))){ map.put(new Key(i), "Number:" + i); } } //Thread.sleep(1000L); } ...... } jvisualvm.exe截图
图中时间点16:07:30进入内存泄漏方法
绿色箭头, 接近堆内存使用峰值.
红色箭头, 宕机
蓝色箭头, 恢复
S0C S1C S0U S1U EC EU OC OU PC PU YGC YGCT FGC FGCT GCT8704.0 8704.0 2520.3 0.0 69952.0 44990.8 174784.0 116411.3 61696.0 61600.4 203 1.352 17 4.381 5.7338704.0 8704.0 2520.3 0.0 69952.0 45200.2 174784.0 116411.3 61696.0 61600.4 203 1.352 17 4.381 5.7338704.0 8704.0 2520.3 0.0 69952.0 45408.2 174784.0 116411.3 61696.0 61600.7 203 1.352 17 4.381 5.7338704.0 8704.0 2520.3 0.0 69952.0 45616.6 174784.0 116411.3 61696.0 61600.7 203 1.352 17 4.381 5.7338704.0 8704.0 2520.3 0.0 69952.0 65486.6 174784.0 116411.3 61952.0 61700.4 203 1.352 17 4.381 5.7338704.0 8704.0 0.0 6224.6 69952.0 34025.9 174784.0 116411.3 61952.0 61940.6 204 1.370 17 4.381 5.7518704.0 8704.0 0.0 6224.6 69952.0 37953.5 174784.0 116411.3 62208.0 62144.6 204 1.370 17 4.381 5.7518704.0 8704.0 0.0 6224.6 69952.0 39470.7 174784.0 116411.3 62208.0 62188.6 204 1.370 17 4.381 5.7518704.0 8704.0 0.0 6224.6 69952.0 41256.0 174784.0 116411.3 62208.0 62207.5 204 1.370 18 4.381 5.7518704.0 8704.0 0.0 0.0 69952.0 7639.7 174784.0 122571.6 62976.0 62918.8 204 1.370 18 4.879 6.2498704.0 8704.0 0.0 0.0 69952.0 7895.4 174784.0 122571.6 62976.0 62918.8 204 1.370 18 4.879 6.2498704.0 8704.0 0.0 0.0 69952.0 8120.1 174784.0 122571.6 62976.0 62918.8 204 1.370 18 4.879 6.2498704.0 8704.0 0.0 0.0 69952.0 8375.8 174784.0 122571.6 62976.0 62918.9 204 1.370 18 4.879 6.2498704.0 8704.0 0.0 0.0 69952.0 8542.6 174784.0 122571.6 62976.0 62919.7 204 1.370 18 4.879 6.2498704.0 8704.0 8704.0 8704.0 69952.0 69952.0 174784.0 174784.0 64000.0 63867.6 206 1.740 19 4.879 6.6198704.0 8704.0 0.0 5090.2 69952.0 69952.0 174784.0 174784.0 64000.0 63868.5 206 1.740 20 5.562 7.3028704.0 8704.0 0.0 8704.0 69952.0 69952.0 174784.0 174784.0 63744.0 63575.6 206 1.740 21 6.481 8.2218704.0 8704.0 0.0 8704.0 69952.0 69952.0 174784.0 174784.0 63744.0 63576.6 206 1.740 22 7.288 9.0288704.0 8704.0 0.0 8704.0 69952.0 69952.0 174784.0 174784.0 63744.0 63577.6 206 1.740 23 8.106 9.8468704.0 8704.0 0.0 8704.0 69952.0 69952.0 174784.0 174784.0 63744.0 63577.6 206 1.740 24 8.883 10.6238704.0 8704.0 0.0 8704.0 69952.0 69952.0 174784.0 174784.0 63744.0 63550.3 206 1.740 25 9.860 11.6008704.0 8704.0 0.0 8703.9 69952.0 69952.0 174784.0 174784.0 63744.0 63551.5 206 1.740 26 10.659 12.3988704.0 8704.0 0.0 8704.0 69952.0 69952.0 174784.0 174784.0 63744.0 63551.5 206 1.740 27 11.451 13.1918704.0 8704.0 0.0 8704.0 69952.0 69952.0 174784.0 174784.0 63744.0 63551.5 206 1.740 28 12.267 14.0078704.0 8704.0 0.0 8460.2 69952.0 69952.0 174784.0 174784.0 63744.0 63547.9 206 1.740 30 14.022 15.7628704.0 8704.0 0.0 8704.0 69952.0 69952.0 174784.0 174784.0 63744.0 63547.9 206 1.740 31 14.818 16.5588704.0 8704.0 0.0 8704.0 69952.0 69952.0 174784.0 174784.0 63744.0 63550.1 206 1.740 32 15.626 17.3668704.0 8704.0 0.0 8704.0 69952.0 69952.0 174784.0 174784.0 63744.0 63550.1 206 1.740 33 16.599 18.3398704.0 8704.0 0.0 8704.0 69952.0 69952.0 174784.0 174784.0 63744.0 63550.1 206 1.740 34 17.380 19.1208704.0 8704.0 0.0 8704.0 69952.0 69952.0 174784.0 174784.0 63744.0 63550.1 206 1.740 36 18.943 20.6838704.0 8704.0 0.0 8704.0 69952.0 69952.0 174784.0 174784.0 63744.0 63549.9 206 1.740 37 19.831 21.5718704.0 8704.0 0.0 8704.0 69952.0 69952.0 174784.0 174784.0 63744.0 63549.9 206 1.740 38 20.606 22.3468704.0 8704.0 0.0 8704.0 69952.0 69952.0 174784.0 174784.0 63744.0 63549.9 206 1.740 39 21.383 23.1238704.0 8704.0 0.0 8704.0 69952.0 69952.0 174784.0 174784.0 63744.0 63549.9 206 1.740 41 22.966 24.7068704.0 8704.0 0.0 8704.0 69952.0 69952.0 174784.0 174784.0 63744.0 63549.9 206 1.740 42 23.738 25.4788704.0 8704.0 0.0 8704.0 69952.0 69952.0 174784.0 174784.0 63744.0 63549.9 206 1.740 43 24.517 26.2578704.0 8704.0 0.0 8703.9 69952.0 69952.0 174784.0 174784.0 63744.0 63549.9 206 1.740 44 25.293 27.0338704.0 8704.0 0.0 8704.0 69952.0 69952.0 174784.0 174784.0 63744.0 63549.9 206 1.740 45 26.176 27.9158704.0 8704.0 0.0 8704.0 69952.0 69952.0 174784.0 174784.0 63744.0 63549.9 206 1.740 47 27.780 29.5208704.0 8704.0 0.0 8703.9 69952.0 69952.0 174784.0 174784.0 63744.0 63549.9 206 1.740 48 28.583 30.3238704.0 8704.0 0.0 8703.9 69952.0 69952.0 174784.0 174784.0 63744.0 63549.9 206 1.740 49 29.371 31.1118704.0 8704.0 0.0 8703.9 69952.0 69952.0 174784.0 174784.0 63744.0 63549.9 206 1.740 50 30.190 31.9308704.0 8704.0 0.0 8703.9 69952.0 69952.0 174784.0 174784.0 63744.0 63549.9 206 1.740 51 31.189 32.9298704.0 8704.0 0.0 8704.0 69952.0 69952.0 174784.0 174784.0 63744.0 63472.8 206 1.740 52 31.997 33.7378704.0 8704.0 0.0 8704.0 69952.0 69952.0 174784.0 174784.0 63488.0 63482.2 206 1.740 54 33.806 35.5468704.0 8704.0 0.0 8703.7 69952.0 69952.0 174784.0 174784.0 63488.0 63484.4 206 1.740 55 34.589 36.3298704.0 8704.0 0.0 8704.0 69952.0 69952.0 174784.0 174784.0 63488.0 63487.7 206 1.740 56 35.375 37.1148704.0 8704.0 0.0 8704.0 69952.0 69952.0 174784.0 174784.0 63488.0 63487.5 206 1.740 57 36.283 38.0238704.0 8704.0 0.0 8704.0 69952.0 69952.0 174784.0 174784.0 63744.0 63490.9 206 1.740 58 37.056 38.7968704.0 8704.0 0.0 6.8 69952.0 1400.4 174784.0 111915.3 63744.0 63521.6 208 1.744 59 38.400 40.1448704.0 8704.0 107.9 0.0 69952.0 64537.2 174784.0 111915.3 63744.0 63540.5 209 1.746 59 38.400 40.1478704.0 8704.0 107.9 0.0 69952.0 64754.1 174784.0 111915.3 63744.0 63542.5 209 1.746 59 38.400 40.1478704.0 8704.0 107.9 0.0 69952.0 64971.6 174784.0 111915.3 63744.0 63542.5 209 1.746 59 38.400 40.1478704.0 8704.0 107.9 0.0 69952.0 65191.5 174784.0 111915.3 63744.0 63542.6 209 1.746 59 38.400 40.1478704.0 8704.0 107.9 0.0 69952.0 65494.9 174784.0 111915.3 63744.0 63543.9 209 1.746 59 38.400 40.1478704.0 8704.0 107.9 0.0 69952.0 69952.0 174784.0 111915.3 63744.0 63545.1 209 1.746 59 38.400 40.1478704.0 8704.0 0.0 155.1 69952.0 307.5 174784.0 111915.3 63744.0 63545.1 210 1.748 59 38.400 40.1498704.0 8704.0 0.0 155.1 69952.0 457.2 174784.0 111915.3 63744.0 63545.1 210 1.748 59 38.400 40.1498704.0 8704.0 0.0 155.1 69952.0 761.1 174784.0 111915.3 63744.0 63545.1 210 1.748 59 38.400 40.1498704.0 8704.0 0.0 155.1 69952.0 912.8 174784.0 111915.3 63744.0 63545.1 210 1.748 59 38.400 40.1498704.0 8704.0 0.0 155.1 69952.0 1216.3 174784.0 111915.3 63744.0 63545.1 210 1.748 59 38.400 40.1498704.0 8704.0 0.0 155.1 69952.0 1368.0 174784.0 111915.3 63744.0 63545.1 210 1.748 59 38.400 40.1498704.0 8704.0 0.0 155.1 69952.0 1669.4 174784.0 111915.3 63744.0 63545.1 210 1.748 59 38.400 40.1498704.0 8704.0 0.0 155.1 69952.0 1825.3 174784.0 111915.3 63744.0 63547.1 210 1.748 59 38.400 40.1498704.0 8704.0 0.0 155.1 69952.0 2179.4 174784.0 111915.3 63744.0 63547.1 210 1.748 59 38.400 40.1498704.0 8704.0 0.0 155.1 69952.0 2333.9 174784.0 111915.3 63744.0 63547.1 210 1.748 59 38.400 40.1498704.0 8704.0 0.0 155.1 69952.0 2487.6 174784.0 111915.3 63744.0 63547.1 210 1.748 59 38.400 40.1498704.0 8704.0 0.0 155.1 69952.0 2786.9 174784.0 111915.3 63744.0 63547.1 210 1.748 59 38.400 40.1498704.0 8704.0 0.0 155.1 69952.0 2942.6 174784.0 111915.3 63744.0 63547.1 210 1.748 59 38.400 40.1498704.0 8704.0 0.0 155.1 69952.0 3239.9 174784.0 111915.3 63744.0 63547.1 210 1.748 59 38.400 40.1498704.0 8704.0 0.0 155.1 69952.0 25764.5 174784.0 111915.3 63744.0 63547.1 210 1.748 59 38.400 40.1498704.0 8704.0 0.0 155.1 69952.0 26066.4 174784.0 111915.3 63744.0 63547.1 210 1.748 59 38.400 40.1498704.0 8704.0 0.0 155.1 69952.0 26222.5 174784.0 111915.3 63744.0 63547.1 210 1.748 59 38.400 40.1498704.0 8704.0 198.3 0.0 69952.0 249.7 174784.0 111915.3 63744.0 63547.1 211 1.751 59 38.400 40.1518704.0 8704.0 198.3 0.0 69952.0 415.4 174784.0 111915.3 63744.0 63547.1 211 1.751 59 38.400 40.1518704.0 8704.0 198.3 0.0 69952.0 19151.7 174784.0 111915.3 63744.0 63555.4 211 1.751 59 38.400 40.1518704.0 8704.0 198.3 0.0 69952.0 25719.0 174784.0 111915.3 63744.0 63594.3 211 1.751 59 38.400 40.1518704.0 8704.0 198.3 0.0 69952.0 30240.2 174784.0 111915.3 63744.0 63630.6 211 1.751 59 38.400 40.1518704.0 8704.0 198.3 0.0 69952.0 30494.3 174784.0 111915.3 63744.0 63630.6 211 1.751 59 38.400 40.1518704.0 8704.0 198.3 0.0 69952.0 30753.0 174784.0 111915.3 63744.0 63630.6 211 1.751 59 38.400 40.1518704.0 8704.0 198.3 0.0 69952.0 30879.9 174784.0 111915.3 63744.0 63630.6 211 1.751 59 38.400 40.1518704.0 8704.0 198.3 0.0 69952.0 31133.8 174784.0 111915.3 63744.0 63630.6 211 1.751 59 38.400 40.1518704.0 8704.0 198.3 0.0 69952.0 31387.1 174784.0 111915.3 63744.0 63630.6 211 1.751 59 38.400 40.1518704.0 8704.0 198.3 0.0 69952.0 31520.4 174784.0 111915.3 63744.0 63630.6 211 1.751 59 38.400 40.1518704.0 8704.0 198.3 0.0 69952.0 31768.1 174784.0 111915.3 63744.0 63630.6 211 1.751 59 38.400 40.1518704.0 8704.0 198.3 0.0 69952.0 32027.5 174784.0 111915.3 63744.0 63630.6 211 1.751 59 38.400 40.1518704.0 8704.0 198.3 0.0 69952.0 32154.4 174784.0 111915.3 63744.0 63630.6 211 1.751 59 38.400 40.1518704.0 8704.0 198.3 0.0 69952.0 32408.6 174784.0 111915.3 63744.0 63630.6 211 1.751 59 38.400 40.1518704.0 8704.0 198.3 0.0 69952.0 32671.6 174784.0 111915.3 63744.0 63630.6 211 1.751 59 38.400 40.1518704.0 8704.0 198.3 0.0 69952.0 32948.1 174784.0 111915.3 63744.0 63630.6 211 1.751 59 38.400 40.1518704.0 8704.0 198.3 0.0 69952.0 33200.2 174784.0 111915.3 63744.0 63630.7 211 1.751 59 38.400 40.1518704.0 8704.0 198.3 0.0 69952.0 33457.5 174784.0 111915.3 63744.0 63630.7 211 1.751 59 38.400 40.151
可以看出从第19次Full GC开始Eden区和 老年代(Old Generation)的 总大小和使用大小相等, 即GC无法再回收掉内存, 也就无法分配空间给新对象. 抛出异常 java.lang.OutOfMemoryError: Java heap space
Exception in thread "ContainerBackgroundProcessor[StandardEngine[Catalina]]" java.lang.OutOfMemoryError: Java heap space at java.util.Arrays.copyOf(Arrays.java:2882) at java.lang.StringValue.from(StringValue.java:24) at java.lang.String.(String.java:178) at java.io.Win32FileSystem.resolve(Win32FileSystem.java:241) at java.io.File. (File.java:312) at org.apache.naming.resources.FileDirContext.file(FileDirContext.java:770) at org.apache.naming.resources.FileDirContext.doGetAttributes(FileDirContext.java:398) at org.apache.naming.resources.BaseDirContext.getAttributes(BaseDirContext.java:1163) at org.apache.naming.resources.BaseDirContext.getAttributes(BaseDirContext.java:1116) at org.apache.naming.resources.ProxyDirContext.getAttributes(ProxyDirContext.java:882) at org.apache.catalina.loader.WebappClassLoaderBase.modified(WebappClassLoaderBase.java:1185) at org.apache.catalina.loader.WebappLoader.modified(WebappLoader.java:500) at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoader.java:420) at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1341) at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1542) at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1552) at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1552) at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1520) at java.lang.Thread.run(Thread.java:662)Exception in thread "RMI TCP Connection(idle)" java.lang.OutOfMemoryError: Java heap space at java.io.ObjectInputStream$BlockDataInputStream. (ObjectInputStream.java:2352) at java.io.ObjectInputStream. (ObjectInputStream.java:274) at sun.rmi.server.MarshalInputStream. (MarshalInputStream.java:111) at sun.rmi.transport.ConnectionInputStream. (ConnectionInputStream.java:38) at sun.rmi.transport.StreamRemoteCall.getInputStream(StreamRemoteCall.java:115) at sun.rmi.transport.Transport.serviceCall(Transport.java:124) at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:535) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) at java.lang.Thread.run(Thread.java:662)
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