JVM on multiple CPUs

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davidkad - 13 Nov 2005 20:44 GMT

My application is multi-threaded and runs on a single JVM.
1) On a multi-CPU machine, will the JVM automatically take advantage of
the multiple CPUs and run the threads across the multiple CPUs?
2) Do I have to use native threads?
3) Is there a difference betweeb Windows and UNIX (Solaris, HPUX)

thanks

David

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Benji - 13 Nov 2005 20:56 GMT

> My application is multi-threaded and runs on a single JVM.
> 1) On a multi-CPU machine, will the JVM automatically take advantage of
> the multiple CPUs and run the threads across the multiple CPUs?
> 2) Do I have to use native threads?
> 3) Is there a difference betweeb Windows and UNIX (Solaris, HPUX)

1) This is dependant on the actual VM implementation. For most platforms
(windows, linux, Solaris), it will be a native thread implementation.

2) I'm not sure I understand the question...the thread implementation is
dependant on the VM. Some VMs will let you specified whether you're using
native threads (that can use different CPUs) or green threads (which are
implemented virtually inside of the VM, and cannot run on multiple CPUs)

3) You'd have to check the documentation for the exact version of the VM
and exact version of OS. But in most cases, it will use native threads.

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JVM on multiple CPUs

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