[英]how to generate thread dump java on out of memory error
does java 6 generate thread dump in addition to heap dump (java_pid14941.hprof)除了堆转储(java_pid14941.hprof)之外,java 6 是否还生成线程转储
this is what happened to one of my applications.这就是我的一个应用程序发生的情况。
java.lang.OutOfMemoryError: GC overhead limit exceeded Dumping heap to java_pid14941.hprof ... java.lang.OutOfMemoryError: GC 开销限制超出 Dumping heap to java_pid14941.hprof ...
I did find ava_pid14941.hprof in working directory, but didn't find any file which contains thread dump.我确实在工作目录中找到了 ava_pid14941.hprof,但没有找到任何包含线程转储的文件。 I need to know what all the threads were doing when I got this OutOfMemory error.
当我收到 OutOfMemory 错误时,我需要知道所有线程在做什么。
Is there any configuration option which will generate thread dump in addition to heap dump on out of memory exception?除了内存不足异常的堆转储之外,是否有任何配置选项会生成线程转储?
If you're in a Linux/Unix environment you can do this:如果你在 Linux/Unix 环境中,你可以这样做:
-XX:OnOutOfMemoryError="kill -3 %p"
This way you don't have to have your application generate periodic thread dumps and you'll get a snapshot when it actually chokes.这样你就不必让你的应用程序生成周期性的线程转储,当它实际阻塞时你会得到一个快照。
With %p
, you don't need to pass the PID, JVM will automatically pick the correct process id as mentioned here .使用
%p
,您无需传递 PID,JVM 将自动选择此处提到的正确进程 ID。
How to generate thread dump java on out of memory error?
如何在内存不足错误时生成线程转储 java?
Your question can be simplified into:你的问题可以简化为:
and:和:
So it's actually quite easy, you could do it like this:所以它实际上很容易,你可以这样做:
install a default uncaught exception handler安装默认的未捕获异常处理程序
upon catching an uncaught exception, check if you have an OutOfMemoryError捕获未捕获的异常后,检查您是否有 OutOfMemoryError
if you have an OutOfMemoryError, generate yourself a full thread dump and either ask the user to send it to you by email or offer to send it automatically如果您有 OutOfMemoryError,请为自己生成一个完整的线程转储,并要求用户通过电子邮件将其发送给您,或者提供自动发送
Bonus: it works fine on 1.5 too :)奖励:它在 1.5 上也能正常工作:)
Thread.setDefaultUncaughtExceptionHandler( new Thread.UncaughtExceptionHandler() {
public void uncaughtException( final Thread t, final Throwable e ) {
...
}
You may want to look into this:你可能想看看这个:
e.getMessage();
and this:和这个:
Thread.getAllStackTraces();
I'm doing this all the time in an app that is shipped on hundreds of different 1.5 and 1.6 JVM (on different OSes).我一直在一个应用程序中这样做,该应用程序在数百个不同的 1.5 和 1.6 JVM(在不同的操作系统上)上提供。
It's possible to trigger a thread dump when OnOutOfMemoryError is triggered using jstack.当使用 jstack 触发 OnOutOfMemoryError 时,可以触发线程转储。 eg:-
例如:-
jstack -F pid > /var/tmp/<identifier>.dump
-XX:OnOutOfMemoryError="kill -3 %p"
The JVM argument to take thread dump sadly don't work.可悲的是,JVM 参数进行线程转储不起作用。 Child process cannot end SIGQUIT to parent.
子进程不能结束对父进程的 SIGQUIT。
Oracle has -XX:CrashOnOutOfMemoryError
but this is available on Java 8. Oracle 有
-XX:CrashOnOutOfMemoryError
但这在 Java 8 上可用。
Based on the accepted answer I created utility class.基于接受的答案,我创建了实用程序类。 This one you can define as a Spring bean and you're all set with extended logging.
您可以将这个定义为 Spring bean,并且您都设置了扩展日志记录。
import java.util.Iterator;
import java.util.Map;
import javax.annotation.PostConstruct;
import org.apache.commons.lang3.exception.ExceptionUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class UncaughtExceptionLogger {
private final static Logger logger = LoggerFactory.getLogger(UncaughtExceptionLogger.class);
@PostConstruct
private void init() {
Thread.setDefaultUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler() {
public void uncaughtException(final Thread t, final Throwable e) {
String msg = ExceptionUtils.getRootCauseMessage(e);
logger.error(String.format("Uncaght exception handler captured expcetion '%s'", msg), e);
if (msg.contains("unable to create new native thread")) {
String dump = captureThreadDump();
logger.error(String.format(
"OutOfMemoryError has been captured for threads limit. Thread dump: \n %s", dump), e);
}
if (ExceptionUtils.getRootCause(e) instanceof OutOfMemoryError) {
String dump = captureThreadDump();
logger.error(String.format("OutOfMemoryError has been captured. Thread dump: \n %s", dump), e);
}
}
});
}
public static String captureThreadDump() {
/**
* http://stackoverflow.com/questions/2787976/how-to-generate-thread-
* dump-java-on-out-of-memory-error
* http://henryranch.net/software/capturing-a-thread-dump-in-java/
*/
Map<Thread, StackTraceElement[]> allThreads = Thread.getAllStackTraces();
Iterator<Thread> iterator = allThreads.keySet().iterator();
StringBuffer stringBuffer = new StringBuffer();
while (iterator.hasNext()) {
Thread key = (Thread) iterator.next();
StackTraceElement[] trace = (StackTraceElement[]) allThreads.get(key);
stringBuffer.append(key + "\r\n");
for (int i = 0; i < trace.length; i++) {
stringBuffer.append(" " + trace[i] + "\r\n");
}
stringBuffer.append("");
}
return stringBuffer.toString();
}
}
I don't think there is anything in java that would provide you with on-exit thread dumps.我认为 Java 中没有任何东西可以为您提供退出时的线程转储。 I tackle this when necessary by having a cronjob that does periodic
kill -3 pid
.我在必要时通过定期执行
kill -3 pid
的 cronjob 来解决这个问题。 Yes, it does clutter the logs a bit, but the footprint is still negligible.是的,它确实使日志有点混乱,但足迹仍然可以忽略不计。
And if you are suffering from OOM, it might be be beneficial to see how the situation evolved thread-wise.如果您正遭受 OOM 的困扰,那么了解情况如何逐线演变可能会有所帮助。
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