The Htop command is an open source ncurses-based process viewer for Linux. This is similar to the top command, but allows you to scroll vertically and horizontally, so you can see all the processes running the system with their entire command line.
CoreFreq provides a framework for retrieving CPU data with a high degree of accuracy. By default the corefreq output displays the number of CUP cores in the system. It is a set of global and unique CPU attributes. You can count the number of cores in the system using python multiprocessing.
Alternatively, import the os module using syscall getconf. SM Guru points. Sadashiva Murthy M. Active Contributor points. Jonathan Groves. S- Newbie 7 points. Shah Ashequr Rahman -. My System Showing 2 sockets but it attached 4 subscription..
DV Community Member 39 points. Dennis Voetelink. SK Newbie 14 points. Stanley Kmiec. Each different item in every column has an unique ID starting from zero. SH Newbie 7 points. Steven Heasley. So when accounting for purchase, the physical processor is what counts as a socket? GF Newbie 18 points.
Generic Fujistu. Community Member 59 points. Felipe Aranda. NS Red Hat Newbie 17 points. Nirav Surati. John Sincock. I've confirmed by looking in the IMM that this is a 4 socket server, so that is absolutely certain, but dmidecode also gives wrong answer dmidecode --type processor grep -c "Populated, Enabled" 8 just Designation: wc -l 8 So, once again, dmidecode method gives wrong answer, although in this case, the cpuinfo method gave the correct answer.
Nothing ever "just works" with linux does it. Here are the common uses of Markdown. Learn more Close. I wanted to find out how many cores my system has, so I searched the same question in Google.
I got some commands such as the lscpu command. When I tried this command, it gave me the following result:. To get a complete picture you need to look at the number of threads per core, cores per socket and sockets. If you multiply these numbers you will get the number of CPUs on your system. The output of nproc corresponds to the CPU count from lscpu.
For the desktop machine above this should match the 8 CPU s reported by lscpu :. For the desktop machine above this should match the 4 Core s per socket reported by lscpu:. To specifically answer your question you tell how many cores you have by multiplying the number of cores you have per socket by the number of sockets you have. Another useful utility is dmidecode which outputs per socket information. In the case of the server system listed above we expect to see 8 cores per socket and 16 threads per socket:.
The lscpu command has a number of useful options that you may like to check out, for example:. You have to look at sockets and cores per socket.
In this case you have 1 physical CPU socket which has 4 cores cores per socket. You can get this information by nproc 1 command. For the answer not to be confusing, you need to understand a couple of simple computer architecture concepts:. There are different types of instructions. The decision logic inside a CPU will dispatch the different instructions to different hardware units.
A core refers to a set of actual execution hardware i. A socket is the physical slot on the motherboard into which a chip is inserted. This chip has a certain number of cores on it.
Two physical sockets, each containing a chip with 4 physical cores, making 8 cores total. The first machine can be executing precisely four instructions at any given time, period. The second machine can execute between 8 and 16 instructions at any given time: 16 will be achieved only when each pair of CPUs is executing different types of instructions and so can share a core without waiting. Each chunk starts with this info:. Cores are numbered starting from 0, so if the last chunk says processor : 3 as in this case, your machine has 4 cores.
That's all you need. It is the number of core online, regardless if hyperthreading is on or off. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
Create a free Team What is Teams? Dominic Motuka 5 5 silver badges 12 12 bronze badges. This doesn't work with hyperthreading if I need the number of physical cores. Returns 8 on my quad core i7 box. On my old ubuntu It must be a new-ish addition. Unfortunatelly, nproc is not a part of boot2docker — kgadek. Show 5 more comments. This worked for me on Red Hat Entreprise Linux 5. It seems this it the most portable, as lscpu is not installed by default on these systems. Can you link to it?
Though you asked a long time ago, just wanted to share my suggestion if it is helpful for you or someone else. Show 6 more comments. Uses lscpu for Linux, and sysctl for macOS. Yes sorry you are correct about the sort command. I can't find any information about books beyond the lscpu manual. I think it is related to NUMA en. I think most solutions here ignore multi-socket machines, unlike this one. In terms of linux, there are many contexts where lscpu isn't available, such as installer images.
I like it.. Vadzim Sh4msi Sh4msi 6 6 silver badges 11 11 bronze badges. Fravadona Fravadona 1, 10 10 silver badges 20 20 bronze badges. Works and handles multiple sockets — jbo This is the best answer. You can also use Python! With python 2. In REPL they do. VytenisBivainis Thanks, I fixed my answer! This worked for me. I don't know whether the numbers will start over at zero for a second physical processor, however The first line did not work for me.
This works for me. Sergey Sergey 1, 19 19 silver badges 16 16 bronze badges. On mine, this returns the number of hyperthreads. I'd also need to know the number of physical cores and number of sockets.
OK - the exact same command with hw. Not sure yet about the socket count
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