Assigning CPU for OS only

To set the operating system to run on cores 2 and 3 only, you can use the isolcpus kernel parameter in Linux. Here are the steps:

1. Edit the GRUB configuration file to add the isolcpus parameter. You can use the command sudo nano /etc/default/grub to edit the file.
2. Locate the GRUB_CMDLINE_LINUX_DEFAULT line in the file, which contains the default kernel command line parameters.
3. Add the isolcpus parameter to the end of the line, specifying cores 2 and 3. The line should look something like this:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash isolcpus=2,3"

4. Save the changes to the file and exit the editor.

5. Update the GRUB configuration to apply the changes. You can use the command sudo update-grub to update the configuration.

6. Reboot the system for the changes to take effect. After rebooting, the operating system will only run on cores 2 and 3.

Note that isolating cores from the operating system may have performance implications and is generally not recommended unless you have a specific use case that requires it. Make sure to test the system thoroughly after making these changes to ensure that it is stable and performing as expected.