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#Cat proc cpuinfo virtual address how to#
#Cat proc cpuinfo virtual address full#
#Cat proc cpuinfo virtual address code#

#Cat proc cpuinfo virtual address full#

To give a simple example, if you have a single core and two processes P0 and P1 that are running full speed doing some computation, the operating system will run:

#Cat proc cpuinfo virtual address code#

To make sure all the code can run, the operating system schedules them on and off cores as needed. They can’t all run at the same time, only 4 can be using CPU cores at any given time. No matter how many CPU cores you have, on general purpose computers you are almost always running more processes than cores.įor example, the fairly quiescent Linux machine I’m using for this article has 260 different process IDs if I run ps xa, from ssh to the screensaver to bash sessions.Ģ60 is a lot bigger than 4, so how can all those processes proceed? How operating systems deal with limited cores Model name : Intel(R) Core(TM) i7-6700T CPU 2.80GHz If I look at /proc/cpuinfo on Linux, I can get info about these cores: Per the linked specs, it has 4 cores, so it can run 4 different computations in parallel, one on each core. Modern computers typically have multiple cores, so you can run multiple computations in parallel.įor example, I have a computer with an Intel i7-6700T CPU.

CPU sharing limits available via containers.Īs a gross simplification, back in the day many computers only had a single core, which meant only one computation could happen at any given time.

The impact of virtualization on these various resources, including what cloud vCPUs mean.

How operating systems deal with multiple processes that want to use limited number of CPU cores.

The hardware limits of CPUs’ cores and “hyperthreads”.

Once you add virtualization into the mix, those competing processes might be invisible… but they’re still there. If you have other processes competing for the same limited hardware resources, your code will run more slowly. When you have some spare time, take a look at the /proc filesystem on your Linux system for other system information you can find, including /proc/loadavg, /proc/vmstat, and much more.Sometimes your program is slow not because of your code, but because of where it’s running. I hope these Linux processor and memory commands have been helpful. Summary: Linux processor and memory commands

When I issue the Linux memory information command, I see the following output:Īs you can see, my current Linux system has 2 GB RAM, with all the additional memory information shown there. Model name : Intel(R) Pentium(R) 4 CPU 3.00GHzįlags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe constant_tsc pni monitor ds_cpl cid xtprįrom that output I can see my current system is a two-processor Intel system, with additional information about the Intel CPU (CPUs, actually). When I issue that Linux processor information command on my current hardware system, I see this output: (See below for sample output.) Linux processor command output To see your Linux memory information and memory stats use this command:

#Cat proc cpuinfo virtual address how to#

(See below for sample processor output.) How to show Linux memory information To see what type of processor/CPU your computer system has, use this Linux command:Īs you can see, all you have to do is use the Linux cat command on this special /proc/cpuinfo file on your Linux system. Linux FAQ: How can I find Linux processor and memory information? (Also written as, How can I find Linux CPU information?, How can I find Linux RAM information?) How to show the Linux CPU/processor