Virtual Machine CPU core

[dickson lee]

Hi All,

want to know if my server have 16 cores of cpu,
my VM ubuntu currently using 1 socket 4 core,
If i increase to 16 cores.
May i know the performances VM will increase based on the cpu cores?

 

[BobhWasatch]

Using more cores than the VM actually needs is a waste of cores. So the answer is it depends on the workload in that VM. IOW, you are asking the wrong question. The right question is "how many cores does this workload need"? You will usually have to experiment. Add a few more cores and see if it makes any difference. Often you will find you need much less memory & cores than you might intuitively expect.

In general it is not a good idea to allocate all cores to a single VM.