What is the process scheduling scheme used in Unix?
Unix scheduling is basically a time-slice based round-robin algorithm with multilevel priority queues which favours interactive jobs.Process priority is determined by various factors. Processes in kernel mode have higher priority. User process priorities are based on the recent ratio of the amount of compute time to real time, which is typically updated every second. Thus, if a process hogs the CPU, its priority drops. In this way, I/O bound jobs are given higher priority.
