关于Java线程和进程优先级的一些问题

Question

I have a small question about threads. On Unix systems, we have nice , which can be used to set priorities processes. OK, on ​​my system, I call some external processes, however, I would like to set priority for them. In unix, I could call other ProcessBuilder and set the nice to process I want, but in Windows, it is not possible.

If I start a thread with some priority, and use within ProcessBuilder it, the process will have the same priority as thread? Or is there some other way to do this?

Cheers

Answer 1

There's no way to set priority on a process ( Process ) level in Java.

If I start a thread with some priority, and use ProcessBuilder within it, the process will have the same priority as thread? Or is there some other way to do this?

The process will run side by side with the JVM, so it will not inherit the threads priority. It will be scheduled on it's own by the operating system.

As stated above, there is no built in cross-platform way of tweaking the priority of a process, but there is a Thread.setPriority(int) though. So perhaps you could do the work by the external program in a separate thread (instead of starting a new process) and use the setPriority method on this thread.

Related questions / answers:

• Cross-platform way to change java process priority
• How to change the priority of a running java process?

Answer 2

You could write a C/C++ DLL and export a JNI function that calls SetPriorityClass

You could then use this in your java code