Direct buffer memory

Direct buffer memory 溢出，救不了了

测试环境

JDK Version : jdk1.8.0_271
VM Options: -XX:MaxDirectMemorySize=1024m -XX:+PrintGCDetails

测试代码

package com.javabook.jvm.thread.direct;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;
import com.javabook.jvm.MyUnsafe;
/**
 * https://www.oracle.com/webfolder/technetwork/tutorials/obe/java/gc01/index.html
 *
 * -XX:MaxDirectMemorySize=1024m -XX:+PrintGCDetails
 * 
 *Exception in thread "main" java.lang.OutOfMemoryError: Direct buffer memory
 *    at java.nio.Bits.reserveMemory(Bits.java:658)
 *    at java.nio.DirectByteBuffer.<init>(DirectByteBuffer.java:123)
 *    at java.nio.ByteBuffer.allocateDirect(ByteBuffer.java:311)
 *    at com.javabook.jvm.oom.thread.direct.JvmOOMEOfDirectMemoryMain.main(JvmOOMEOfDirectMemoryMain.java:33)
 * 
 * @author Summer Lu
 * @email gmluyang@gmail.com
 * @date 2014-8-25
 *
 */
public class JvmOutOfMemoryErrorOfDirectMemoryDemo {
    /**
     * @param args
     * @throws InterruptedException
     */
    public static void main(String[] args) throws InterruptedException {
        System.out.println("Max Memory: "+MyUnsafe.getMaxMemory());
        int _1MB = 1024 * 1024;
        List<ByteBuffer> byteBuffers = new ArrayList<ByteBuffer>();
        while(true){
            ByteBuffer byteBuffer = ByteBuffer.allocateDirect(_1MB);
            byteBuffers.add(byteBuffer);
            System.out.println("Reserved Memory: "+MyUnsafe.getReservedMemory());
            Thread.sleep(50);
        }        
    }
}

VisualVM

Console

C:\Java\jdk1.8.0_271\bin\java.exe -XX:MaxDirectMemorySize=1024m -XX:+PrintGCDetails -javaagent:C:\Users\luyang\AppData\Local\JetBrains\Toolbox\apps\IDEA-U\ch-0\202.7660.26\lib\idea_rt.jar=11978:C:\Users\luyang\AppData\Local\JetBrains\Toolbox\apps\IDEA-U\ch-0\202.7660.26\bin -Dfile.encoding=UTF-8 -classpath C:\Java\jdk1.8.0_271\jre\lib\charsets.jar;C:\Java\jdk1.8.0_271\jre\lib\deploy.jar;C:\Java\jdk1.8.0_271\jre\lib\ext\access-bridge-64.jar;C:\Java\jdk1.8.0_271\jre\lib\ext\cldrdata.jar;C:\Java\jdk1.8.0_271\jre\lib\ext\dnsns.jar;C:\Java\jdk1.8.0_271\jre\lib\ext\jaccess.jar;C:\Java\jdk1.8.0_271\jre\lib\ext\jfxrt.jar;C:\Java\jdk1.8.0_271\jre\lib\ext\localedata.jar;C:\Java\jdk1.8.0_271\jre\lib\ext\nashorn.jar;C:\Java\jdk1.8.0_271\jre\lib\ext\sunec.jar;C:\Java\jdk1.8.0_271\jre\lib\ext\sunjce_provider.jar;C:\Java\jdk1.8.0_271\jre\lib\ext\sunmscapi.jar;C:\Java\jdk1.8.0_271\jre\lib\ext\sunpkcs11.jar;C:\Java\jdk1.8.0_271\jre\lib\ext\zipfs.jar;C:\Java\jdk1.8.0_271\jre\lib\javaws.jar;C:\Java\jdk1.8.0_271\jre\lib\jce.jar;C:\Java\jdk1.8.0_271\jre\lib\jfr.jar;C:\Java\jdk1.8.0_271\jre\lib\jfxswt.jar;C:\Java\jdk1.8.0_271\jre\lib\jsse.jar;C:\Java\jdk1.8.0_271\jre\lib\management-agent.jar;C:\Java\jdk1.8.0_271\jre\lib\plugin.jar;C:\Java\jdk1.8.0_271\jre\lib\resources.jar;C:\Java\jdk1.8.0_271\jre\lib\rt.jar;C:\Github\study\javabook\javabook-jvm\target\classes;C:\Users\luyang\.m2\repository\cglib\cglib\3.2.4\cglib-3.2.4.jar;C:\Users\luyang\.m2\repository\org\ow2\asm\asm\6.0_ALPHA\asm-6.0_ALPHA.jar;C:\Users\luyang\.m2\repository\org\apache\ant\ant\1.9.6\ant-1.9.6.jar;C:\Users\luyang\.m2\repository\org\apache\ant\ant-launcher\1.9.6\ant-launcher-1.9.6.jar com.javabook.jvm.thread.direct.JvmOutOfMemoryErrorOfDirectMemoryDemo
Max Memory: 1073741824
Reserved Memory: 1048576
Reserved Memory: 2097152
Reserved Memory: 3145728
Reserved Memory: 4194304
Reserved Memory: 5242880
Reserved Memory: 6291456
Reserved Memory: 7340032
Reserved Memory: 8388608
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[GC (System.gc()) [PSYoungGen: 42110K->2320K(153088K)] 42110K->2344K(502784K), 0.0026413 secs] [Times: user=0.00 sys=0.00, real=0.00 secs] 
[Full GC (System.gc()) [PSYoungGen: 2320K->0K(153088K)] [ParOldGen: 24K->2116K(349696K)] 2344K->2116K(502784K), [Metaspace: 9381K->9381K(1058816K)], 0.0121335 secs] [Times: user=0.02 sys=0.00, real=0.01 secs] 
Exception in thread "main" java.lang.OutOfMemoryError: Direct buffer memory
    at java.nio.Bits.reserveMemory(Bits.java:695)
    at java.nio.DirectByteBuffer.<init>(DirectByteBuffer.java:123)
    at java.nio.ByteBuffer.allocateDirect(ByteBuffer.java:311)
    at com.javabook.jvm.thread.direct.JvmOutOfMemoryErrorOfDirectMemoryDemo.main(JvmOutOfMemoryErrorOfDirectMemoryDemo.java:40)
Heap
 PSYoungGen      total 153088K, used 11404K [0x0000000715d00000, 0x0000000720780000, 0x00000007c0000000)
  eden space 131584K, 8% used [0x0000000715d00000,0x0000000716823200,0x000000071dd80000)
  from space 21504K, 0% used [0x000000071dd80000,0x000000071dd80000,0x000000071f280000)
  to   space 21504K, 0% used [0x000000071f280000,0x000000071f280000,0x0000000720780000)
 ParOldGen       total 349696K, used 2116K [0x00000005c1600000, 0x00000005d6b80000, 0x0000000715d00000)
  object space 349696K, 0% used [0x00000005c1600000,0x00000005c1811250,0x00000005d6b80000)
 Metaspace       used 9514K, capacity 9880K, committed 9984K, reserved 1058816K
  class space    used 1111K, capacity 1203K, committed 1280K, reserved 1048576K

Process finished with exit code 1

Direct buffer GC

Direct buffer导致GC，还能抢救一下

测试代码

package online.javabook.jvm.garbage.thread.thread.direct;

import online.javabook.jvm.garbage.thread.MyUnsafe;

import java.nio.ByteBuffer;


/**
 * https://www.oracle.com/webfolder/technetwork/tutorials/obe/java/gc01/index.html
 *
 * -XX:MaxDirectMemorySize=1024m
 * 
 *Exception in thread "main" java.lang.OutOfMemoryError: Direct buffer memory
 *    at java.nio.Bits.reserveMemory(Bits.java:658)
 *    at java.nio.DirectByteBuffer.<init>(DirectByteBuffer.java:123)
 *    at java.nio.ByteBuffer.allocateDirect(ByteBuffer.java:311)
 *    at com.javabook.jvm.oom.thread.direct.JvmOOMEOfDirectMemoryMain.main(JvmOOMEOfDirectMemoryMain.java:33)
 * 
 * @author Summer Lu
 * @email gmluyang@gmail.com
 * @date 2014-8-25
 *
 */
public class GCOfDirectMemoryDemo {

    /**
     * @param args
     * @throws InterruptedException
     */
    public static void main(String[] args) throws InterruptedException {

        System.out.println("Max Memory: "+ MyUnsafe.getMaxMemory());

        int _1MB = 1024 * 1024 * 100;

        while(true){
            ByteBuffer byteBuffer = ByteBuffer.allocateDirect(_1MB);
            System.out.println("Reserved Memory: "+MyUnsafe.getReservedMemory());
            Thread.sleep(50);
        }        
    }
}

C:\Java\jdk1.8.0_271\bin\java.exe -Dvisualvm.id=162927320473100 -XX:MaxDirectMemorySize=1024m -XX:+PrintGCDetails -javaagent:C:\Users\luyang\AppData\Local\JetBrains\Toolbox\apps\IDEA-U\ch-0\211.7442.40\lib\idea_rt.jar=1078:C:\Users\luyang\AppData\Local\JetBrains\Toolbox\apps\IDEA-U\ch-0\211.7442.40\bin -Dfile.encoding=UTF-8 -classpath C:\Java\jdk1.8.0_271\jre\lib\charsets.jar;C:\Java\jdk1.8.0_271\jre\lib\deploy.jar;C:\Java\jdk1.8.0_271\jre\lib\ext\access-bridge-64.jar;C:\Java\jdk1.8.0_271\jre\lib\ext\cldrdata.jar;C:\Java\jdk1.8.0_271\jre\lib\ext\dnsns.jar;C:\Java\jdk1.8.0_271\jre\lib\ext\jaccess.jar;C:\Java\jdk1.8.0_271\jre\lib\ext\jfxrt.jar;C:\Java\jdk1.8.0_271\jre\lib\ext\localedata.jar;C:\Java\jdk1.8.0_271\jre\lib\ext\nashorn.jar;C:\Java\jdk1.8.0_271\jre\lib\ext\sunec.jar;C:\Java\jdk1.8.0_271\jre\lib\ext\sunjce_provider.jar;C:\Java\jdk1.8.0_271\jre\lib\ext\sunmscapi.jar;C:\Java\jdk1.8.0_271\jre\lib\ext\sunpkcs11.jar;C:\Java\jdk1.8.0_271\jre\lib\ext\zipfs.jar;C:\Java\jdk1.8.0_271\jre\lib\javaws.jar;C:\Java\jdk1.8.0_271\jre\lib\jce.jar;C:\Java\jdk1.8.0_271\jre\lib\jfr.jar;C:\Java\jdk1.8.0_271\jre\lib\jfxswt.jar;C:\Java\jdk1.8.0_271\jre\lib\jsse.jar;C:\Java\jdk1.8.0_271\jre\lib\management-agent.jar;C:\Java\jdk1.8.0_271\jre\lib\plugin.jar;C:\Java\jdk1.8.0_271\jre\lib\resources.jar;C:\Java\jdk1.8.0_271\jre\lib\rt.jar;C:\Github\my\javabook\javabook-jvm-garbage\target\classes;C:\Users\luyang\.m2\repository\cglib\cglib\3.2.4\cglib-3.2.4.jar;C:\Users\luyang\.m2\repository\org\ow2\asm\asm\6.0_ALPHA\asm-6.0_ALPHA.jar;C:\Users\luyang\.m2\repository\org\apache\ant\ant\1.9.6\ant-1.9.6.jar;C:\Users\luyang\.m2\repository\org\apache\ant\ant-launcher\1.9.6\ant-launcher-1.9.6.jar online.javabook.jvm.garbage.thread.thread.direct.GCOfDirectMemoryDemo
Max Memory: 1073741824
Reserved Memory: 104857600
Reserved Memory: 209715200
Reserved Memory: 314572800
Reserved Memory: 419430400
Reserved Memory: 524288000
Reserved Memory: 629145600
Reserved Memory: 734003200
Reserved Memory: 838860800
Reserved Memory: 943718400
Reserved Memory: 1048576000
[GC (System.gc()) [PSYoungGen: 10526K->880K(153088K)] 10526K->888K(502784K), 0.0018057 secs] [Times: user=0.00 sys=0.00, real=0.00 secs] 
[Full GC (System.gc()) [PSYoungGen: 880K->0K(153088K)] [ParOldGen: 8K->745K(349696K)] 888K->745K(502784K), [Metaspace: 3725K->3725K(1056768K)], 0.0081584 secs] [Times: user=0.00 sys=0.00, real=0.01 secs] 
Reserved Memory: 838860800
Reserved Memory: 209715200
Reserved Memory: 314572800
Reserved Memory: 419430400
Reserved Memory: 524288000
Reserved Memory: 629145600
Reserved Memory: 734003200
Reserved Memory: 838860800
Reserved Memory: 943718400
Reserved Memory: 1048576000
[GC (System.gc()) [PSYoungGen: 2631K->96K(153088K)] 3377K->841K(502784K), 0.0004504 secs] [Times: user=0.00 sys=0.00, real=0.00 secs] 
[Full GC (System.gc()) [PSYoungGen: 96K->0K(153088K)] [ParOldGen: 745K->736K(349696K)] 841K->736K(502784K), [Metaspace: 3725K->3725K(1056768K)], 0.0075906 secs] [Times: user=0.00 sys=0.00, real=0.01 secs] 
Reserved Memory: 734003200
Reserved Memory: 314572800
Reserved Memory: 314572800
Reserved Memory: 419430400
Reserved Memory: 524288000
Reserved Memory: 629145600
Reserved Memory: 734003200
Reserved Memory: 838860800
Reserved Memory: 943718400
Reserved Memory: 1048576000
[GC (System.gc()) [PSYoungGen: 5263K->64K(153088K)] 6000K->800K(502784K), 0.0007405 secs] [Times: user=0.00 sys=0.00, real=0.00 secs] 
[Full GC (System.gc()) [PSYoungGen: 64K->0K(153088K)] [ParOldGen: 736K->736K(349696K)] 800K->736K(502784K), [Metaspace: 3726K->3726K(1056768K)], 0.0075069 secs] [Times: user=0.00 sys=0.00, real=0.01 secs] 
Reserved Memory: 838860800
Reserved Memory: 314572800
Reserved Memory: 314572800
Reserved Memory: 419430400
Reserved Memory: 524288000
Reserved Memory: 629145600
Reserved Memory: 734003200
Reserved Memory: 838860800
Reserved Memory: 943718400
Reserved Memory: 1048576000
[GC (System.gc()) [PSYoungGen: 2631K->64K(153088K)] 3368K->800K(502784K), 0.0006875 secs] [Times: user=0.00 sys=0.00, real=0.00 secs] 
[Full GC (System.gc()) [PSYoungGen: 64K->0K(153088K)] [ParOldGen: 736K->736K(349696K)] 800K->736K(502784K), [Metaspace: 3727K->3727K(1056768K)], 0.0054189 secs] [Times: user=0.00 sys=0.00, real=0.01 secs] 
Reserved Memory: 734003200
Reserved Memory: 209715200
Reserved Memory: 314572800
Reserved Memory: 419430400
Reserved Memory: 524288000
Reserved Memory: 629145600
Reserved Memory: 734003200
Reserved Memory: 838860800
Reserved Memory: 943718400
Reserved Memory: 1048576000
[GC (System.gc()) [PSYoungGen: 2631K->64K(153088K)] 3368K->800K(502784K), 0.0008473 secs] [Times: user=0.00 sys=0.00, real=0.00 secs] 
[Full GC (System.gc()) [PSYoungGen: 64K->0K(153088K)] [ParOldGen: 736K->736K(349696K)] 800K->736K(502784K), [Metaspace: 3727K->3727K(1056768K)], 0.0053532 secs] [Times: user=0.00 sys=0.02, real=0.01 secs] 
Reserved Memory: 734003200
Reserved Memory: 209715200
Reserved Memory: 314572800
Reserved Memory: 419430400
Reserved Memory: 524288000
Reserved Memory: 629145600
Reserved Memory: 734003200
Reserved Memory: 838860800
Reserved Memory: 943718400
Reserved Memory: 1048576000
[GC (System.gc()) [PSYoungGen: 2631K->32K(153088K)] 3368K->768K(502784K), 0.0016593 secs] [Times: user=0.00 sys=0.00, real=0.00 secs] 
[Full GC (System.gc()) [PSYoungGen: 32K->0K(153088K)] [ParOldGen: 736K->736K(349696K)] 768K->736K(502784K), [Metaspace: 3729K->3729K(1056768K)], 0.0028328 secs] [Times: user=0.00 sys=0.00, real=0.00 secs] 
Reserved Memory: 838860800
Reserved Memory: 209715200
Reserved Memory: 314572800
Reserved Memory: 419430400
Reserved Memory: 524288000
Reserved Memory: 629145600
Reserved Memory: 734003200
Reserved Memory: 838860800
Reserved Memory: 943718400
Reserved Memory: 1048576000
[GC (System.gc()) [PSYoungGen: 2631K->64K(153088K)] 3368K->800K(502784K), 0.0010194 secs] [Times: user=0.00 sys=0.00, real=0.00 secs] 
[Full GC (System.gc()) [PSYoungGen: 64K->0K(153088K)] [ParOldGen: 736K->736K(349696K)] 800K->736K(502784K), [Metaspace: 3731K->3731K(1056768K)], 0.0067192 secs] [Times: user=0.00 sys=0.00, real=0.01 secs] 
Reserved Memory: 838860800
Reserved Memory: 314572800
Reserved Memory: 314572800
Reserved Memory: 419430400
Reserved Memory: 524288000
Reserved Memory: 629145600
Reserved Memory: 734003200
Reserved Memory: 838860800
Reserved Memory: 943718400
Reserved Memory: 1048576000
[GC (System.gc()) [PSYoungGen: 5263K->32K(153088K)] 6000K->776K(502784K), 0.0003991 secs] [Times: user=0.00 sys=0.00, real=0.00 secs] 
[Full GC (System.gc()) [PSYoungGen: 32K->0K(153088K)] [ParOldGen: 744K->736K(349696K)] 776K->736K(502784K), [Metaspace: 3737K->3737K(1056768K)], 0.0030641 secs] [Times: user=0.00 sys=0.00, real=0.00 secs] 
Reserved Memory: 838860800
Reserved Memory: 314572800
Reserved Memory: 314572800
Reserved Memory: 419430400