XMON number of threads with HyperThreading

[andrator]

According to the XMON manual the default number of threads is 2 times the number of processors plus 1. I'm using a 3 GHz Xeon with HyperThreading enabled on Windows 2003 SP1.

Do I need to apply this formula to the physical number of processors (2 x 1 + 1 = 3) or the number of HT processors (2 x 2 + 1 = 5)?

[Brian N]

Sorry, but what are you asking about?
I'm lost.

[IcePanther]

I think he talks about Dual Core processors, so physically it's one processor but windows recognizes it as two separate CPU's (I've seen that before)... But I can't tell more since I don't use XMON.

[alglove]

Actually, I think he is asking whether Hyperthreading counts as multiple CPUs or not. I am pretty sure that dual cores would, but Hyperthreading is another matter. However, since I do not use XMON, I do not know the answer, either. :-\

[Brian N]

I think you need to explain your problem/question a little better so we can understand what your talking about :)

[Marcos]

XMON can scan emails in multiple threads which results in higher number of emails scanned at a time. However, every thread requires a lot of resources, hence there are 3 threads preset. This number can be computed for various hardware configurations using the aforementioned formula. I too doubt that HyperThreading could count as another CPU. Even if you had a dual-core CPU, it wouldn't mean that the overall efficiency would be twice as higher as with a sigle-core CPU.

[andrator]

Thanks for the replies.

My question was about a single Xeon 3 GHz CPU. The server supports HyperThreading and in Windows 2003 SP1 there are two CPU's. HyperThreading (as the words says) supports multiple threads. Theoratically the XMON threads could be balanced between both HyperThreaded CPU's.

I'll stick with Marcos reply and leave the XMON setting to 3 threads (2x1=1).