[TriLUG] Ubuntu and hyperthreaded CPUs

[James Tuttle]

I have two of these sitting on my desk.  One is off and unused.  If I
pull the processor out of it and stick it into the working machine, will
I be able see and use 4 CUP's?

That would be awesome.  Of course, it would be a total waste of
electricity, but it would be awesome.

Jim

James Tuttle wrote:
> Oh, yeah.
> 
> 
> Yes.
> 
> 
> Jim
> 
> Christopher L Merrill wrote:
>> So, for the record, that is "YES, Ubuntu also reports
>> a single hyperthreaded CPU as 2 processors".
>>
>> Thanks!
>> C
>>
>>
>> James Tuttle wrote:
>>> I have a Dell Optiplex with a Xeon 2.8 GHz CPU running Ubuntu 6.06.
>>> Here's the cpu info:
>>>
>>> jim at dmz:~$ cat /proc/cpuinfo
>>> processor       : 0
>>> vendor_id       : GenuineIntel
>>> cpu family      : 15
>>> model           : 4
>>> model name      : Intel(R) Xeon(TM) CPU 2.80GHz
>>> stepping        : 1
>>> cpu MHz         : 2793.102
>>> cache size      : 1024 KB
>>> fdiv_bug        : no
>>> hlt_bug         : no
>>> f00f_bug        : no
>>> coma_bug        : no
>>> fpu             : yes
>>> fpu_exception   : yes
>>> cpuid level     : 3
>>> wp              : yes
>>> flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
>>> mca cmov
>>> pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm pni
>>> monitor ds_c
>>> pl cid cx16 xtpr
>>> bogomips        : 5590.35
>>>
>>> processor       : 1
>>> vendor_id       : GenuineIntel
>>> cpu family      : 15
>>> model           : 4
>>> model name      : Intel(R) Xeon(TM) CPU 2.80GHz
>>> stepping        : 1
>>> cpu MHz         : 2793.102
>>> cache size      : 1024 KB
>>> fdiv_bug        : no
>>> hlt_bug         : no
>>> f00f_bug        : no
>>> coma_bug        : no
>>> fpu             : yes
>>> fpu_exception   : yes
>>> cpuid level     : 3
>>> wp              : yes
>>> flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
>>> mca cmov
>>>                                                                pat pse36
>>> clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm pni monitor ds_c
>>>
>>>                                                     pl cid cx16 xtpr
>>> bogomips        : 5586.18
>>>
>>>
>>> Christopher L Merrill wrote:
>>>> Does Ubuntu 7.04 recognize a single Xeon as 2 processors if
>>>> hyperthreading is enabled?
>>>>
>>>> A specific example:
>>>>    http://i133.photobucket.com/albums/q55/axvel/new/IMG_7386.jpg
>>>>
>>>> Would that be a single CPU machine?  I know RHEL/CentOS works
>>>> this way...so I was curious if the others do too.  I assume so,
>>>> since this is probably determined by the kernel.
>>>>
>>>> TIA,
>>>> C
>>>>
>>
> 
> 


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--
---Jim Tuttle
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