How to find out if my debian server setup is a dual core or not?

Question

I have access to root and would like to find out.

Thanks

Answer 1

$ cat /proc/cpuinfo

That should give info about how many cores are available and which type they are.

Answer 2

The place to look is /proc/cpuinfo, as others have said. However, at a glance this does not tell you whether a server is dual-core. If you see two entries, it could be because

• the server has one processor with two cores
• the server has one processor that supports hyperthreading
• the server has two processors with one core each

For example, take this information from cpuinfo.

$ grep processor /proc/cpuinfo
processor   : 0
processor   : 1
processor   : 2
processor   : 3
processor   : 4
processor   : 5
processor   : 6
processor   : 7

I can see that there are 8 logical processors, but I don't know how many CPUs and cores there are.

$ grep 'physical id' /proc/cpuinfo
physical id : 0
physical id : 0
physical id : 0
physical id : 0
physical id : 0
physical id : 0
physical id : 0
physical id : 0

Now I know there is only one CPU, but I don't know if it has 8 cores or 4 cores and hyperthreading.

$ grep 'core id' /proc/cpuinfo
core id     : 0
core id     : 1
core id     : 2
core id     : 3
core id     : 0
core id     : 1
core id     : 2
core id     : 3

Now I have the complete picture; this is a single quad-core CPU with hyperthreading.