Is there any way to find out if SpeedStep is enabled without going into the BIOS, i.e. I'm not sysadmin of these machines, but before I start bugging our sysadmins about this, I wanted to be sure that this is not the behaviour which is to be expected. However, a watch -n5 "cat /proc/cpuinfo | grep MHz" shows that the first six cores are constantly at 3067MHz, while cores 7-12 are always at 1600MHz. So it seems none of the processors are idling. Model name : Intel(R) Xeon(R) CPU X5675 3.07GHzįlags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 popcnt lahf_lm ida arat epb dts tpr_shadow vnmi flexpriority ept vpidĪddress sizes : 40 bits physical, 48 bits virtualĮDIT: htop shows all processors at 100%, and the load average is 24.66 24.33 24.67. However, I don't understand why the processor speed in the model name line differs from the cpu MHz number: processor : 11
Thus, "number behind cpu cores" x "number behind physical id + 1" is the number of physical cores one our node (8 x (3 + 1)). For example: > cat /proc/cpuinfo processor : 0 vendorid : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Xeon(R) CPU 5130 2.00GHz stepping : 6 cpu MHz : 1995. > cat /proc/cpuinfo | grep "physical id" | tail -1 When running cat /proc/cpuinfo under Linux, a variety information is kicked-back. > cat /proc/cpuinfo | grep -c "cpu cores" This is the output I get: > cat /proc/cpuinfo | grep -m 1 "cpu cores" If we have such a setup, we need to consider the row physical id in cat /proc/cpuinfo. Thus, we get 64 'packages' of information. I just looked onto one node of a computing cluster, on which I am currently working: 1 node has 4 CPUs (Intel Xeon) with each 8 physical cores each CPU supports hyptherthreading therefore, each CPU has 16 virtual cores summing it up, the one node has 32 physical and 64 virtual cores Ĭat /proc/cpuinfo prints out information for each virtual core. You could also take the last found processor number and increment it by one > cat /proc/cpuinfo | grep "processor" | tail -1 Command nproc prints the number of processing units available to the current process, which may be less than the number of online processors. Use nproc which is part of coreutils, so it should be available on most Linux installs. Number of virtual cores: > cat /proc/cpuinfo | grep -l "cpu cores" Processing the contents of /proc/cpuinfo is needlessly baroque. Number of physical cores: > cat /proc/cpuinfo | grep -m 1 "cpu cores" Lets see what I get: > cat /proc/cpuinfo | grep "cpu cores" I have got a Intel(R) Core(TM) i7-3740QM CPU 2.70GHz (4 physical cores, hyperthreading). It will list a lot of information about the cpu, including the number of CPU cores on your system. Open the terminal and run this command: cat /proc/cpuinfo. Another way to check the number of cpu cores in Linux is by looking at the /proc/cpuinfo file. Thus, if you want to have the number of physical core, you just take the first occurrence of the line cpu cores, which is > cat /proc/cpuinfo | grep -m 1 "cpu cores"Īlternatively, if you are looking for the number of virtual cores, you count the number of times the line cpu cores is found, which is > cat /proc/cpuinfo | grep -c "cpu cores" Check CPU cores from /proc/cpuinfo File in Linux. But it prints out this information for each virtual core. The command cat /proc/cpuinfo should print out the number of physical cores in the line cpu cores.
#CAT PROC CPUINFO PATCH#
This may be the case if you work on a computing cluster or on a high-end desktop workstation for CAD/Engineering-purposes. It will contain cpuinsecure if your kernel has the KPTI patch I've found that the KPTI patch has this piece of code: / Assume for now that ALL x86 CPUs are insecure / setupforcecpubug (X86BUGCPUINSECURE) And after the kernel update, you get: bugs : cpuinsecure PS. See section "Several CPUs per mainboard". If you have more than one CPU/processor (in this sense) on your mainboard this does not properly work. 2x number of physical cores with hyper threading): > cat /proc/cpuinfo | grep -c "cpu cores" The number of physical cores: > cat /proc/cpuinfo | grep -m 1 "cpu cores"
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