Similarly, a quad core CPU has four central processing units and an octa core CPU has eight central processing units. Initially, CPUs use to come with single core, but manufacturers added more cores to increase performance, which is why the core came into the picture.įor example, a dual-core CPU has two central processing units, so it appears to be two CPUs per operating system. This is called a physical CPU (central processing unit). What’s a CPU Socket?Ī CPU socket or CPU slot is a connector on the motherboard that allows a computer processor to connect to the motherboard. Hope this article helps you understand exactly what it is. If commands like lscpu, dmidecode can show you the amount of CPUs, Cores and threads/siblings for each, then the issue is with how cpuinfo handles the information.All Linux systems run on multi-core CPU processors, but many of us are confused to find or understand CPU, cores, and Threads information. This might be do to how cpuinfo shows this for AMD or that specific family model. Since in your case it is showing all 8 cores, it means the CPU is detected correctly although the amount of siblings are not all shown. Version: Intel(R) Core(TM) i7-2600 CPU 3.40GHzĪlso in a benchmark in OpenBenchmark I found your model and there is one line that shows the following when doing cat on /proc/cpuinfo: cpu cores : 8 In my case dmidecode says: sudo dmidecode -t processor | grep -e Core -e Thread Sudo dmidecode -t processor | grep -e Core -e Thread and add the information to your question. It would also help to find out why if you could execute the following: In your case it is suppose to show 8 cores (In my case it is 4 cores) so it will show a long list but since it is repeating itself after the 4th core, it looks like is either not reading the other cores (BIOS issue, Kernel issue) or the cpuinfo is not detecting it correctly. If you have more sockets in your motherboard, the amount of physical IDs will go up along with the amount of cores. So in the end it shows for that one physical id, 4 core ids and 4 HT. There are actually 4 cores and 4 HT ones. Next we have the core ids that reference that physical id. Think of it as for each socket in the motherboard there is one physical id. Since I have an Intel motherboard that only has one socket, this means I only have one physical id. Here is an Intel i7 2600 to compare with: cat /proc/cpuinfo | grep -e ^core -e ^phys Power management: ts ttp tm stc 100mhzsteps hwpstate Model name : AMD Opteron(tm) Processor 6128įlags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nonstop_tsc extd_apicid amd_dcm pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt nodeid_msr npt lbrv svm_lock nrip_save pausefilterĪddress sizes : 48 bits physical, 48 bits virtual Full entry for the 8th "processor": processor : 7 So one should interpret this /proc/cpuinfo entry as a 4-core CPU with hyperthreading. My understanding so far has been that different cores within the same physical CPU would have different core id, and if core ids are identical, this is due to hyperthreading. An Opteron 6128 shows up as follows in /proc/cpuinfo: $ cat /proc/cpuinfo | grep -e ^core -e ^phys
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