the sstf scheduling algorithm
时间: 2024-01-06 14:05:20 浏览: 42
The SSTF (Shortest Seek Time First) scheduling algorithm is a disk scheduling algorithm used by the operating system to determine the order in which disk access requests are processed.
In SSTF, the operating system chooses the request with the shortest seek time from the current head position. The seek time is the time required for the disk arm to move the read/write head to the track where the requested sector resides. This algorithm always services the request closest to the current head position, minimizing the average seek time and, therefore, improving the overall disk access performance.
However, SSTF may cause starvation for requests that are located far away from the current head position, as they may never get serviced. Additionally, it may lead to increased disk movement due to frequent changes in the head position, which can lead to decreased performance.
Overall, SSTF is a commonly used disk scheduling algorithm due to its ability to minimize the average seek time and improve disk access performance.
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