By assigning the affinity for the corresponding program, it will only utilize the selected cores thus allowing space for other programs to run properly and smoothly. Now usually when an application runs using all the cores available in the CPU then you might notice the system slowing down. If you are looking for a more geeky explanation then you can find it here. In other words, you can say scheduling the process only on certain CPUs or allocating the number of CPUs to a program. Then you can select whether you want the program to use either all the 4 cores or any number you desire. you have a Quad-core processor with say 4 cores. To keep it simple, processor affinity means pinning or deciding how many CPUs can a program or application utilize in order to run. That being said, Windows does offer you control in the form of processor affinity where you can assign the particular CPU(s) for specific applications. But in some cases, the lighter applications can also take all the processors in order to execute, which can result in a lag of other applications. Multiple CPUs are utilized by heavy applications in order for them to run smoothly. Your computer comes with multiple CPUs and cores which ranges differently on every PC.
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