Final answer:
First-come-first-serve (FCFS) is a scheduling policy used in computer science to determine the order of task execution. It tends to favor I/O bound processes over processor bound processes, which can impact performance. FCFS also assumes a single customer arrival, which may not reflect real-world scenarios.
Step-by-step explanation:
First-come-first-serve (FCFS) is a scheduling policy used in computer science to determine the order in which tasks or processes are executed. It works by executing tasks in the order they arrive, with the first task in the queue being the first one to be executed. While FCFS is simple to implement, it has its drawbacks.One of the drawbacks is that FCFS tends to favor I/O bound processes over processor bound processes. I/O bound processes are those that spend most of their time in input/output operations, such as reading from or writing to a disk. On the other hand, processor bound processes are ones that heavily utilize the CPU. Since FCFS executes tasks in the order they arrive, I/O bound processes, which often have shorter bursts of CPU usage, may complete quickly, leading to the CPU being idle. This can result in poorer performance for processor bound processes that require more CPU time.
Another limitation of FCFS is that it assumes a single customer arrives at a time. In reality, people often arrive in groups, which means multiple customers may arrive simultaneously. FCFS doesn't take this into account, potentially leading to longer waiting times for groups of customers.