S. R. Arora
ABSTRACT
This paper deals with the analysis of queues at drums in a computer system. For this analysis the computer system may be viewed as being composed of two units; (1) central processing unit and (2) the auxiliary storage devices (drum subsystem). Requests for the drum subsystem originate from the central processing unit (CPU). In a multiprogramming environment, a number of jobs are concurrently active in the system. Each job may be either waiting or being serviced by one of these units. I/O requests generated by CPU may compete for the services provided by a single drum subsystem. Concurrent requests by the CPU cause queues in front of a drum subsystem. Queuing conflicts cause delays in servicing a request and reduce maximum throughput capability of the system. These conflicts may be reduced by applying one or more of the following techniques.
1. Increasing the number of channels to a subsystem.
2. Varying the number of devices to a subsystem.
3. Increasing the speed of a subsystem.
4. Better file organization. etc.
- Drum queueing model
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