I'm running a large multithreaded java job on a 64-core machine. The program has been running for days and I would like to change the priority of some threads created by java (not of the main thread), but without cancelling and restarting the program, as that would be a large waste of time and computing resources.
我正在64核计算机上运行一个大型多线程java作业。这个程序已经运行了好几天，我希望更改java创建的一些线程的优先级(不是主线程)，但是不取消和重新启动这个程序，因为这将浪费大量的时间和计算资源。
Are there any ways to change thread priority at runtime, from the OS (linux)? I know the renice command in linux can renice the entire process, but I'm looking for a way to change the priority of the created threads at runtime (which doesn't seem to happen with just a renice).
有什么方法可以在运行时从操作系统(linux)更改线程优先级吗?我知道linux中的renice命令可以重命名整个进程，但是我正在寻找一种方法来改变在运行时创建的线程的优先级(这种情况似乎并不仅仅发生在renice上)。
1 个解决方案
#1
2
It depends on your Java and Linux version but you can do this:
这取决于您的Java和Linux版本，但您可以这样做:
Make a thread dump of your application. First jps to find the process ID, then jstack for a thread dump.
创建应用程序的线程转储。首先jps查找进程ID，然后jstack查找线程转储。
The dump will contain nids:
转储将包含nids:
"GC task thread#0 (ParallelGC)" prio=10 tid=0x00007f322001f800 nid=0x6bd3 runnable
That's the PID of the thread in hex. You can use printf to convert it to decimal:
这是hex中线程的PID。您可以使用printf将其转换为decimal:
printf "%d\n" 0x6bd3
which gives us 27603.
这给了我们27603。
You can now use renice with this PID to change the thread priority.
您现在可以使用带有此PID的renice来更改线程优先级。
Sources:
来源:
- How to find a Java thread running on Linux with ps -axl?
- 如何找到一个在Linux上使用ps -axl运行的Java线程?
- What is Java thread priority? (found in Setting priority to Java's threads)
- 什么是Java线程优先级?(在设置Java线程的优先级时发现)
- http://linux.die.net/man/1/chrt
- http://linux.die.net/man/1/chrt
#1
2
It depends on your Java and Linux version but you can do this:
这取决于您的Java和Linux版本，但您可以这样做:
Make a thread dump of your application. First jps to find the process ID, then jstack for a thread dump.
创建应用程序的线程转储。首先jps查找进程ID，然后jstack查找线程转储。
The dump will contain nids:
转储将包含nids:
"GC task thread#0 (ParallelGC)" prio=10 tid=0x00007f322001f800 nid=0x6bd3 runnable
That's the PID of the thread in hex. You can use printf to convert it to decimal:
这是hex中线程的PID。您可以使用printf将其转换为decimal:
printf "%d\n" 0x6bd3
which gives us 27603.
这给了我们27603。
You can now use renice with this PID to change the thread priority.
您现在可以使用带有此PID的renice来更改线程优先级。
Sources:
来源:
- How to find a Java thread running on Linux with ps -axl?
- 如何找到一个在Linux上使用ps -axl运行的Java线程?
- What is Java thread priority? (found in Setting priority to Java's threads)
- 什么是Java线程优先级?(在设置Java线程的优先级时发现)
- http://linux.die.net/man/1/chrt
- http://linux.die.net/man/1/chrt