8/2/2023 0 Comments Affinity photo for linux![]() numactl utility can also be used in NUMA machines. Taskset is linux utility program used to set or retrieve the CPU affinity of a running process given its PID or to launch a new COMMAND with a given CPU affinity. This can be viewed as a modification of the native central queue scheduling algorithm in a symmetric multiprocessing (SMP) operating system Similar to IRQ affinity, it enables the binding and unbinding of a process or a thread to a CPU or a range of CPUs, so that the process or thread will execute only on the designated CPU or CPUs rather than any CPU. What is Processor affinity or CPU pinning? It comes with the latest kernel in most of the Linux variant. Irqbalance is a command line tool that distributes hardware interrupts across processors to improve system performance. particular IRQ will be handled only by a specific set of processors. It allows you to restrict or repartition the workload that your server must do so that it can more efficiently do its job. IRQ affinity is an ability of Linux to assign (affinity) certain IRQs to specific processors (or groups of processors) i.e. For example keyboard, USB, network card etc each have their own IRQ. ![]() In order to prevent multiple devices from sending the same interrupts, the IRQ system was established where each device in a computer system is assigned its own special IRQ so that its interrupts are unique. The interrupt tells the CPU that something has happened and that the CPU should drop what it's doing to handle the event. In simple word, Whenever a hardware such as a disk controller or ethernet card needs attention from CPU it sends a signal knows as Interrupt. I will start by explaining terminologies used and then how can we use it to achieve the desired result.Īn interrupt is a signal to the processor emitted by hardware or software indicating an event that needs immediate attention. This will help you to optimise CPU load according to your specific requirement and improve performance. The purpose of this article is to explain how CPU affinity works in Linux machine and how it is handled in multi-processor system. However, I will try to explain everything in simple language to make it easy for newbies as well. This article is going to be bit technical and requires basic knowledge of Computer System Architecture.
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