How To Find Cpu Count In Linux

All Linux systems run on multi-core CPU processors, but many of the states are confused to detect or sympathise CPU, cores, and Threads information.

Hope this article helps you sympathise exactly what information technology is.

What's a CPU Socket?

A CPU socket or CPU slot is a connector on the motherboard that allows a estimator processor to connect to the motherboard. This is called a physical CPU (primal processing unit).

What is the CPU Core?

Initially, CPUs use to come with single core, only manufacturers added more than cores to increase functioning, which is why the core came into the moving-picture show.

For example, a dual-core CPU has two central processing units, and so it appears to exist two CPUs per operating organization.

Similarly, a quad cadre CPU has four cardinal processing units and an octa core CPU has eight primal processing units.

What is CPU Thread?

Intel'south hyper-threading technology makes it possible to use processor resource more than efficiently by running multiple threads in each cadre (each cadre has ii threads).

This improves processor throughput and improves overall performance in threaded software.

See the post-obit details for better understanding of this in existent-time. This is the sample data I took from my system.

CPU(s):                8 On-line CPU(s) list:   0-7 Thread(s) per core:    two Core(due south) per socket:    4 Socket(s):             one

A physical CPU (1), which has iv CPU cores, and has two threads in each cadre.

The adding is below: CPUs = Threads Per Core X Number of cores per socket X Number of CPU (Sockets).

Output: 2 x 4 10 i = 8

Method-1: How to find the number Of CPUs on Linux using the "/proc/cpuinfo" file

The "/proc/cpuinfo" file is a virtual text file that contains information nearly CPUs (central processing units) on a estimator.

It contains useful information like CPU architecture, vendor proper noun, model name. You tin can only become a number of CPUs by using the grep command as follows.

$ grep -c ^processor /proc/cpuinfo  8

To view detailed data about the CPU, run the following command.

$ true cat /proc/cpuinfo  processor	: 0 vendor_id	: GenuineIntel cpu family	: 6 model		: 94 model proper noun	: Intel(R) Core(TM) i7-6700HQ CPU @ ii.60GHz stepping	: 3 microcode	: 0xd6 cpu MHz		: 2577.190 enshroud size	: 6144 KB physical id	: 0 siblings	: 8 core id		: 0 cpu cores	: 4 apicid		: 0 initial apicid	: 0 fpu		: yes fpu_exception	: yes cpuid level	: 22 wp		: yes flags		: 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 art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf tsc_known_freq pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb invpcid_single pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm mpx rdseed adx smap clflushopt intel_pt xsaveopt xsavec xgetbv1 xsaves dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp md_clear flush_l1d bugs		: cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs taa itlb_multihit bogomips	: 5184.00 clflush size	: 64 cache_alignment	: 64 address sizes	: 39 bits physical, 48 bits virtual power direction:

Method-ii: How to bank check the number of CPUs on Linux using the nproc Control

Information technology prints the number of processing units bachelor for the current process. It is part of the GNU Coreutils parcel, which is installed by default on most Linux systems.

$ nproc  8

Method-3: How to notice the number of CPUs on Linux using the lscpu Command

The lscpu command displays information virtually the CPU architecture, which is collected from the sysfs and the /proc/cpuinfo file.

The information includes, number of CPUs, threads, cores, sockets, NUMA nodes, CPU caches, CPU family and model, which print infomration in human readable format.

$ lscpu  Architecture:                    x86_64 CPU op-mode(due south):                  32-bit, 64-chip Byte Order:                      Little Endian Address sizes:                   39 bits physical, 48 bits virtual CPU(s):                          8 On-line CPU(southward) list:             0-vii Thread(s) per core:              2 Core(s) per socket:              4 Socket(s):                       one NUMA node(s):                    i Vendor ID:                       GenuineIntel CPU family:                      6 Model:                           94 Model name:                      Intel(R) Cadre(TM) i7-6700HQ CPU @ 2.60GHz Stepping:                        iii CPU MHz:                         800.010 CPU max MHz:                     3500.0000 CPU min MHz:                     800.0000 BogoMIPS:                        5184.00 Virtualization:                  VT-x L1d cache:                       128 KiB L1i cache:                       128 KiB L2 cache:                        1 MiB L3 cache:                        vi MiB NUMA node0 CPU(s):               0-7 Vulnerability Itlb multihit:     KVM: Mitigation: Split huge pages Vulnerability L1tf:              Mitigation; PTE Inversion; VMX conditional cache flushes, SMT vulnerable Vulnerability Mds:               Mitigation; Clear CPU buffers; SMT vulnerable Vulnerability Meltdown:          Mitigation; PTI Vulnerability Spec store bypass: Mitigation; Speculative Shop Bypass disabled via prctl and seccomp Vulnerability Spectre v1:        Mitigation; usercopy/swapgs barriers and __user pointer sanitization Vulnerability Spectre v2:        Mitigation; Full generic retpoline, IBPB conditional, IBRS_FW, STIBP conditional, RSB filling Vulnerability Tsx async arrest:   Mitigation; Clear CPU buffers; SMT vulnerable Flags:                           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 art arch_perfmon                                   pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf tsc_known_freq pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2a                                  pic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb invpcid_single pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept v                                  pid ept_ad fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm mpx rdseed adx smap clflushopt intel_pt xsaveopt xsavec xgetbv1 xsaves dtherm ida arat pln pts hwp hwp_not                                  ify hwp_act_window hwp_epp md_clear flush_l1d

Alternately employ the lscpu control to print only number of processor.

# lscpu | grep 'CPU(s):' | caput -1 | awk '{print $2}' 8

Method-4: How to cheque the number of CPUs on Linux using the getconf Control

getconf stands for get configuration values. getconf utility used to write the value of the variable specified by the system_var & path_var operand. The value of each configuration variable were obtained from IEEE Std 1003.1-2001

$ getconf _NPROCESSORS_ONLN 8

Method-5: How to find the number of CPUs on Linux using the dmidecode Command

Dmidecode is a tool which reads a computer'south DMI (stands for Desktop Direction Interface) (some say SMBIOS – stands for System Direction BIOS) tabular array contents and display organisation hardware information in a man-readable format.

This table contains a description of the system'southward hardware components, also as other useful data such every bit serial number, Manufacturer data, Release Appointment, and BIOS revision, etc,.,

$ sudo dmidecode -t processor | egrep 'Designation|Count'      	Socket Designation: U3E1 	Core Count: 4 	Thread Count: viii

Total CPUs = CPU1 Thread Count
8=8

Method-6: How to bank check the number of CPUs on Linux using the inxi Command

inxi command is a dandy tool for verifying hardware data on Linux, and offers a wide range of options to get all the hardware information on a Linux organization, which I haven't seen in any other application available on Linux.

It shows organisation hardware, CPU, drivers, Xorg, Desktop, Kernel, gcc version(s), Processes, RAM usage, and a wide variety of other useful information.

$ inxi -C  CPU:       Topology: Quad Core model: Intel Cadre i7-6700HQ bits: 64 type: MT MCP L2 cache: 6144 KiB             Speed: 800 MHz min/max: 800/3500 MHz Core speeds (MHz): 1: 800 2: 800 iii: 800 4: 800 5: 800 half dozen: 800 7: 800 eight: 800

Totally 8 CPUs are listed above

Method-seven: How to find the number of CPUs on Linux using the hwinfo Control

The hwinfo command is a hardware information tool that is used to analyze the hardware on a computer and to brandish detailed data most the variety of hardware components in a human readable format.

It reports data almost CPU, RAM, keyboard, mouse, graphics card, audio, storage, network interface, disk, partition, bios, and span, etc,.,

$ hwinfo --curt --cpu cpu:                                                                                    Intel(R) Core(TM) i7-6700HQ CPU @ two.60GHz, 2666 MHz                        Intel(R) Cadre(TM) i7-6700HQ CPU @ 2.60GHz, 2666 MHz                        Intel(R) Core(TM) i7-6700HQ CPU @ two.60GHz, 2636 MHz                        Intel(R) Core(TM) i7-6700HQ CPU @ 2.60GHz, 2675 MHz                        Intel(R) Cadre(TM) i7-6700HQ CPU @ 2.60GHz, 2650 MHz                        Intel(R) Core(TM) i7-6700HQ CPU @ two.60GHz, 2690 MHz                        Intel(R) Cadre(TM) i7-6700HQ CPU @ 2.60GHz, 2646 MHz                        Intel(R) Core(TM) i7-6700HQ CPU @ two.60GHz, 2609 MHz

A full of 8 CPUs are listed above

Method-8: How to bank check the number of CPUs on Linux using the peak Command

The peak control provides a dynamic real-time view of the running organization processes and a list of tasks currently managed by the Linux kernel.

By default, the top command displays the average of output for all CPUs, and if yous want to print everything separately to the tiptop command output, press 1 "number one" when running the top application.

Method-9: How to find the number of CPUs on Linux using the htop Command

The Htop command is an open up source ncurses-based process viewer for Linux. This is like to the top command, just allows you to scroll vertically and horizontally, so yous can run into all the processes running the system with their entire command line.

Procedure-related tasks (Killing, renicing) can be performed without entering their PIDs.

Method-10: How to check the number of CPUs on Linux using the CorFreq Command

CoreFreq is a CPU monitoring software designed for Intel 64-$.25 processors and supported architectures such as Cantlet, Cadre 2, Nehalem, SandyBridge and superior, AMD Family unit 0F.

CoreFreq provides a framework for retrieving CPU data with a high caste of accurateness. By default the corefreq output displays the number of Cup cores in the system.

Method-11: How to find the number of CPUs on Linux using the "/sys/devices/system/cpu/" file

Alternatively, you lot can become a processor information from the "/sys/devices/system/cpu/" file. It is a set of global and unique CPU attributes. Individual CPU attributes are in subdirectories named by the kernel's logical CPU number.

online: cpus that are online and being scheduled.
possible: cpus that take been allocated resources and can be brought online if they are present.
present: cpus that have been identified as being nowadays in the organization.

# true cat /sys/devices/arrangement/cpu/online # cat /sys/devices/system/cpu/possible # true cat /sys/devices/arrangement/cpu/nowadays 0-seven  # echo $((`cat /sys/devices/organisation/cpu/present | sed 'southward/0-//'` + one)) # echo $((`cat /sys/devices/system/cpu/online | sed 's/0-//'` + one)) # echo $((`true cat /sys/devices/system/cpu/possible | sed 's/0-//'` + 1)) 8

Method-12: How to find the number of CPUs on Linux using the "/proc/interrupts" File

This file contains information about how many times "/proc/interrupts" interrupts the processor.

$ true cat /proc/interrupts | egrep -i 'cpu'             CPU0       CPU1       CPU2       CPU3       CPU4       CPU5       CPU6       CPU7

Method-xiii: How to notice number of CPUs on Linux using the Python multiprocessing.cpu_count() method

You can count the number of cores in the system using python multiprocessing.cpu_count() method. Alternatively, import the os module using syscall getconf.

# python -c 'import multiprocessing as m; impress m.cpu_count()' or # python -c 'import os; print os.sysconf(os.sysconf_names["SC_NPROCESSORS_ONLN"]);'  eight

Method-14: How to check the number of CPUs on Linux using the Python psutil library

psutil (process and system utilities) is a cantankerous-platform library for retrieving data on running processes and system utilization (CPU, retentivity, disks, network, sensors) in Python.

It is useful mainly for system monitoring, profiling and limiting process resources and management of running processes. Information technology implements many functionalities offered by classic UNIX command line tools such equally ps, pinnacle, iotop, lsof, netstat, ifconfig, costless and others.

# python >>> import psutil >>> psutil.cpu_count() viii