CPU from darkrp server switch

Hi, my cpu from my darkrp server switch to different core like this : http://prnt.sc/dvv44d http://prnt.sc/dvv46e http://prnt.sc/dvv47t http://prnt.sc/dvv496

I can set the cpu of my server to only 1 core (with a simple : taskset -cp core pid) but do you think it’s a good thing or not?

My question is : Do you think I have to set the cpu of my server to 1 core or to let the cpu switch to different core?

My OS is Ubuntu 14.04