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Old 11-09-2012, 09:26 AM   #1
grovep
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2 CPUs but should be 1?


Hi I am slowly learning the basics of linux and have Debian Squeeze (6.0.6) installed on my old pc as well as Win XP dual boot using grub. The installation seems to be running slow so I am in the process of reinstalling iceweasel and dabbling. However I have noticed that Debian seems to think I have 2 CPUs where I only have one. If I run
Code:
 cat /proc/cpuinfo | grep "model name"
I get 2 cpus both the same as below.
Code:
model name	: Intel(R) Pentium(R) 4 CPU 2.80GHz
model name	: Intel(R) Pentium(R) 4 CPU 2.80GHz
System monitor also thinks I have 2 CPUs and reports activity for both?
However the PC is an HPD330 which only has 1 CPU P4 2.8. Is there an error in my installation of have I just misunderstood?

Last edited by grovep; 11-09-2012 at 09:30 AM.
 
Old 11-09-2012, 09:46 AM   #2
shefla
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Hi,

If I am right, it may be hyperthreading.
Honestly I don't remember if Pentium 4 already get this.
I would search for below keyword in cpuinfo file:
- physical id
- processor

This should report the total number of physical CPUs:
grep -i "physical id" /proc/cpuinfo | sort -u | wc -l

This should report the total number of logical CPUs:
grep -i "processor" /proc/cpuinfo | sort -u | wc -l

I hope this will help.
Regards
 
1 members found this post helpful.
Old 11-09-2012, 09:48 AM   #3
schneidz
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this mite help:
http://www.linuxquestions.org/questi...ml#post4782300
 
Old 11-09-2012, 10:28 AM   #4
grovep
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I'll check these out. Yes I think the CPU does do Hyperthreading so that is probably it
I'll close question down once checked out
Thanks for your help
 
Old 11-09-2012, 01:58 PM   #5
wpeckham
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This may have nothing for you...

Just an FYI: if you had a quad core processor you would get reports as if you had 4 processors. the utilities actually count CORES, they cannot 'see' how they are packaged.

I am not sure that this is involved in your specific case, just a point of clarification.
 
Old 11-09-2012, 02:55 PM   #6
schneidz
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^ in that case it would probably count 8 cpu's if hyperthreading is activated.
 
Old 11-15-2012, 08:12 AM   #7
grovep
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Thanks for you help - yes I believe it was the hyper-threading that was confusing me
 
  


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