java 如何使用 kill -3 <pid> 命令每 30 秒进行一次 jave 堆转储
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how to take jave heap dump every 30 seconds using kill -3 <pid> command
提问by Raghava Malluvaiah
Please help in this, i want to run a shell script where it should take jave heap dump every 30 seconds using kill -3 command. Thanks in advance.
请帮助解决这个问题，我想运行一个 shell 脚本，它应该使用 kill -3 命令每 30 秒进行一次 jave 堆转储。提前致谢。
回答by Tomasz Nurkiewicz
Have you tried such a simple shell script?
你试过这么简单的shell脚本吗？
while true
do
jmap -dump:file=/tmp/java-`date +%s`.hprof PID_OF_JVM
sleep 30
done
This will create one file pear each snapshot. For thread dump you can use similar script:
这将为每个快照创建一个文件。对于线程转储，您可以使用类似的脚本：
while true
do
jstack PID_OF_JVM > stack-`date +%s`.txt
sleep 30
done
I guess you can use kill -3instead of jstack.
我想你可以使用kill -3代替jstack.
回答by Andrey Borisov
you can do thread dumping from java application using code like this
您可以使用这样的代码从 Java 应用程序进行线程转储
public static String getDumpFor(Thread thread) {
StringBuilder sb = new StringBuilder();
if (thread.isAlive()) {
StackTraceElement[] stackTrace = thread.getStackTrace();
sb.append(thread.toString()).append("\n")
.append(String.format(" State - %s,", thread.getState()))
.append(String.format(" Is daemon = %s,", thread.isDaemon()));
for (StackTraceElement s : stackTrace)
sb.append("\tat ").append(s.getClassName()).append(".").append(s.getMethodName()).append("(").append(s.getFileName()).append(":").append(s.getLineNumber()).append(")")
.append("\n");
}
return sb.toString();
}
public static void dumpActiveThreads() {
Map<Thread, StackTraceElement[]> stackTraces = Thread.getAllStackTraces();
Set<Thread> keySet = stackTraces.keySet();
System.out.println("\nThread dump begin:");
for (Thread thread : keySet)
dumpActiveThread(thread);
System.out.println("\nThread dump end.");
}
and then schedule task like this
然后像这样安排任务
final ScheduledFuture<?> scheduledFuture = scheduledExecutorService.scheduleWithFixedDelay(
new Runnable() {dumpActiveThreads()},
0,
30, TimeUnit.SECONDS);
回答by amicngh
I have not used kill -3command but i have used jmapcommand provided by sun sdk
我没有使用kill -3命令，但我使用jmap了由提供的命令sun sdk
You can write a script and then in script run below command.
您可以编写一个脚本，然后在脚本中运行下面的命令。
${JAVA_HOME}/bin/jmap -dump:file=/home/MyDump.hprof PID
回答by Panky031
3 will give only the thread dump but not the heap dump.Thread dump means you can only check the stack traces for each thread in the JVM.But you are lookin g for the heap dump on linux then need to use the below commands. jmap -dump:file=myheap.bin {pid of which you are looking to take heap dump}. The output "myheap.bin" is not human readable,to read the file you can use the MAT tool. MAT download link: http://www.eclipse.org/mat/
3 将只提供线程转储而不是堆转储。线程转储意味着您只能检查 JVM 中每个线程的堆栈跟踪。但是您正在 linux 上寻找堆转储，然后需要使用以下命令。jmap -dump:file=myheap.bin {您要获取堆转储的pid}。输出“myheap.bin”不是人类可读的，要读取文件，您可以使用 MAT 工具。MAT下载链接：http: //www.eclipse.org/mat/
