The operating system maintains this list, ensuring that CPU time is allocated on a strict chronological basis without any prioritization or reordering based on process complexity or urgency. It is the de facto method for managing physical queues in everyday life, such as lines at a grocery store, a doctor's office, or a customer support hotline.
FCFS Process Arrival Order Rule and How It Works
This leads to high average waiting times and poor throughput. These include average waiting time, turnaround time, and CPU utilization.
Real-World Applications Beyond Computing While often discussed in technical circles, the principle of FCFS extends far beyond digital systems. While its implementation is simple, this algorithm can lead to the "convoy effect," where shorter processes wait behind longer ones, significantly increasing average waiting time and reducing system efficiency.
Understanding FCFS Process Arrival Order Rule
Furthermore, its fairness is inherent; no process is starved of service, as everyone gets their turn in the exact order they requested access. The scheduler selects the process at the head of this queue for execution, and it continues until completion or until it enters a waiting state.
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