How to make Linux see new CPU cores?

Question

linux

Good time. There is a VPS on it with Debian installed, at the request of the hoster, the number of cores on the virtual machine was increased from 1 to 4. Question. How now to force the OS to see new kernels without reinstalling the system?

Answer 1

If the virtualization system is xen, kvm - you just need to reboot the system; if a container-type virtualization system like openvz, virtuozzo - you don't need to do anything.
cat /proc/cpuinfo | grep "processor"