Take the 2-minute tour ×
Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems.. It's 100% free, no registration required.

When I bought my Lenovo Thinkpad 520, it had Windows installed. I promptly cleaned that out and installed Fedora 16. I recently visited the /proc/cpuinfo and, much to my surprise, discovered that it has four CPUs listed (0-3). I do not remember asking for extra CPUs when I got it, believeing I was getting only a single processor. Could this be a mistake in the cpuinfo file?

share|improve this question
4  
Most likely you have a (single) i5 processor: two cores + hyperthreading = 4 CPUs –  don_crissti Mar 8 '13 at 0:03
    
Flag for SuperUser? –  user34080 Mar 13 '13 at 1:23
1  
@ColeJohnson Er. Why? –  Michael Mrozek Mar 13 '13 at 1:30
    
@Michael it's not really Unix specific. Sure, the program is, but this could also affect a Windows system if the program was poorly coded. –  user34080 Mar 13 '13 at 1:45
add comment

2 Answers

up vote 8 down vote accepted

From the T520's specs:

Intel® Core™ i5-2520M processor (dual-core, 2.50GHz, 3MB Cache),

The i5-2520M has 2 cores + hyper threading, for a total of 4 cores seen by the system.

share|improve this answer
add comment

You probably have one processor with two cores and hyper threading technology. The hyper threading doubles the reported CPUs.

2 cores + hyper threading = 4 reported CPUs
share|improve this answer
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.