[SOLVED] How to execute an application using a specific core or cores?

Issue

I'm writing an application that needs to be executed on a specific core of a processor. For Example: If we have 4 cores and i want to execute code on 2nd core only. I need help how to do this.

Solution

The programmer can prescribe his/her own affinities (hard affinities) but use the default scheduler unless a you have a good reason not to.

Here is a C/C++ function to assign a thread to a certain core from Kernel scheduler API:

#include <sched.h>

int sched_setaffinity(pid_t pid, unsigned int len, unsigned long * mask);

It sets the current affinity mask of process pid to *mask. len is the system word size (sizeof(unsigned int long))

To query affinity of a running process:

$ taskset -p 3935

Example output:

pid 3935's current affinity mask: f

Answered By - Adnan Qureshi

Answer Checked By - Pedro (WPSolving Volunteer)