Task Manager only Shows 1 Processor with Xeon

Posted on 2009-02-23
Last Modified: 2013-12-09
I have a HP Proliant DL360 G4 server running Windows 2003 Server. It has one Intel Xeon 3.4 GHz processor. The Intel Processor ID Utility shows that this processor supports Hyper threading. Having a processor that supports hyper threading, I expect to see two processors/cores shown on the performance tab in task manager, but I only see one.

In task manager, I have checked the View->CPU History option and it is set to "One Graph per CPU" (in fact thats the only option given).

I have also tried changing the environmental variable "Number_Of_Processors" from "1" to "2" and reboot but the setting always reverts back to "1" after a reboot and task manager is no different than before.

Device Manager does show "ACPI Multiprocessor PC" under "Computer", which I believe is correct for this type of cpu.
Question by:optikconnex
    LVL 10

    Expert Comment

    Copied from older post entry by garycase:;
    If the CPU utilization is constantly at 99-100% as shown even when the processes tab only shows the kind of utilization shown above, then indeed you have either a bad CPU or something is corrupt in the OS that's causing Task Manager to display incorrectly.    To eliminate the latter possibility, download a demo copy of Everest Ultimate and see what it reports for the CPU utilization [Enable the OSD monitoring page and watch it for a while].
    forgot the link:
    LVL 1

    Accepted Solution

    Your processor may not have HT enabled.  To check this, reboot and enter the BIOS setup menu.  You will find an option there that will indicate if it's enabled.

    Author Closing Comment

    So simple and yet so right. Thanks CC85.

    For those who may have a similar server, watch for the F9 prompt to enter the BIOS. The setting will be under "Advanced Options". Thanks!

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