During a period when the performance of a computer system at...

Name: Problem 3, Chapter 6: Probability, Statistics, and Queuing Theory with Computer Science Applications, Second Edition (Computer Science and Scientific Computing)
Uploaded: 2021-08-10T14:44:30-08:00
Duration: 2 min 16 s
Channel: Sheryl Ezze
Description: During a period when the performance of a computer system at Weezl Words was being measured a particular disk was busy 30 percent of the time. If each transaction required 25 accesses to the disk, on the average, each of which takes 25 milliseconds, what was the average throughput of the system?

During a period when the performance of a computer system at Weezl Words was being measured a particular disk was busy 30 percent of the time. If each transaction required 25 accesses to the disk, on the average, each of which takes 25 milliseconds, what was the average throughput of the system?

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Key Concepts

Disk Utilization

Disk utilization refers to the percentage of time a disk is actively working on data requests. It provides insight into how busy or underutilized a disk is during a certain period and is a critical metric for identifying potential I/O bottlenecks in a system.

Transaction Service Time

Transaction service time represents the total time taken to complete all disk accesses required for a single transaction. This is computed by multiplying the number of disk accesses by the time each access takes, and it indicates the load a single transaction places on the disk.

Throughput

Throughput is the rate at which transactions are processed by the system, typically expressed in transactions per second. It is derived by relating the disk’s available service time (as indicated by its utilization) to the service time per transaction, and it is essential for understanding system performance.

I/O Operation Cost

I/O operation cost is the time expense associated with each access to a disk or any I/O device. Considering the cost per operation allows one to analyze the cumulative impact on a transaction’s performance and overall system responsiveness.

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