Anything related to processor affinity, also known as CPU pinning
The central processing unit or "processor" inside a computer which executes the instructions in a computer program.
Time performance vs
"But i found if i do not set their cpu affinity that is they run on same core 0 the time performance get better than setting cpu affinity 8.76s vs 14.66s"
from question "Why settting CPU affinity make threads run slower?"
"Cpu affinity it s better for the cpu to have a load average of 1.0 and processes to have affinity to a single core"
from question "Bad Django / uwsgi performance"
"The cpu affinity is more like a suggestion to the kernel regarding which cpu to use"
from question "Wait for pid end signal"