Unit 8 System Performance

In: Computers and Technology

Submitted By DDdigit25
Words 511
Pages 3
NT 1110
Unit 8
System Performance When addressing system performance an element that is often overlooked is disk fragmentation, even on a brand new system with plenty of RAM and a high end processor the performance of the hard disk may be a bottleneck causing performance issues. When you format a hard disk the process divides the disk into sectors, the file system groups the sectors into clusters which is the smallest unit of space available for holding a single file or part of a file. If you save a file on a freshly formatted disk the information would be written in contiguous clusters and since the clusters of the file are physically adjacent to each other the components of the hard disk work very efficiently pulling the data in one operation. The problem is hard disks do not stay organized very long. When you add data to an existing file the file system has to allocate more clusters for storage and typically these clusters end up in a different location on the disk. As files are deleted it creates gaps in the arrangement of the contiguously stored files and as you save new files the file system uses up all of these bits of free space resulting in new files being scattered all over the disk in noncontiguous pieces which results in performance issues because the disk heads have to spend more time moving from cluster to cluster before they can read or write data. Process load and the number of running process affect system performance because each process running requires system memory and if there’s a lot of processes running then they’re in turn consuming a lot of memory slowing down system performance. Each process also sends an interrupt to the CPU which causes the CPU to suspend other executions long enough to deal with the interrupts and user input. These things affect system performance because the operating system must arrange the execution of…...

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