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Monday, May 16, 2011

Describe the terms spooling and buffering. [HSEB 2060]

Spooling: It is referred as Simultaneous Peripheral Operation Online. It means to put jobs in a buffer, a special area in memory or on a disk where a device can access them when it is ready. Spooling is useful because devices access data at different rates. The spooling technique is used in multiprogramming environment to offer first chance to the program of higher priority and reduce processor idle time. Each application output files are spooled to separate disk file called spool files and spooling system make queue for output process. The most common spooling application is print spooling.
Buffering: Buffering is the name given to the technique of transferring data into temporary storage prior to processing or output, thus enabling the simultaneous operation of devices.
Swapping: The swapping is a memory management technique applied by Operating systems. Swapping is a technique in which high priority process is swap in main memory and low priority process from main memory to swap out. When high priority process is completed, low priority process is swap in again.

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