cpuhyper-threadinglinuxmulti-core
My CPU has 2 cores, so I can see two parts in /proc/cpuinfo.
But, I want to know if CPUs that support Hyper-Threading (or similar tech), will /proc/cpuinfo give CPU info per core or per thread (or call it sibling)?
I only know that Windows Task Manager will give CPU usage statistics per thread if the CPU supports HT.
Hyper-threading exposes multiple logical cores for a single physical CPU core. In simple terms, hyper-threading makes context-switching more efficient for each CPU core.
Dual-core chips, on the other hand, actually have two physical CPU cores which can execute different processes simultaneously.
There are also other multi-core chips that have many more than two cores, and--as Svish mentioned--Intel's latest multi-core offerings also support Hyper-threading on all the cores.
You can use a CPU identification utility like CPU-Z to determine how many cores you have. As you can see near the bottom of the screenshot, the CPU in this case has 2 physical cores. If the number of threads is higher than the number of cores, Hyper-threading is enabled. To-date all consumer-oriented CPUs with Hyper-threading have 2 threads per core, so if HT is enabled, the number of threads will be 2x the number of cores.
If you have an Intel CPU, you can download Intel's CPU ID utility instead.
The ones that share the same physical core should have the same core id and physical id, with different processor number. Try this:
cat /proc/cpuinfo |egrep "processor|physical id|core id" | sed 's/^processor/\nprocessor/g'
Best Answer
The contents of
/proc/cpuinfocontains information for all processors down to the virtual level.Here are some tips on interpreting the contents:
Thus, a dual-socket, dual-core, hyperthreaded system will show as 8 processors. A similar quad-core system will show as 16 processors.
Within the content of
/proc/cpuinfoeach logical processor has its own ID. If your system is SMP then it will also have aphysical id. This is naturally the physical processor number. If you have a multi-core processor then each logical processor will also have acore id. Core ID's are only unique within a single processor. I.e, physical 0 will have core 0 and core 1, and physical 1 will also have core 0 and core 1.