A keyboard is used at 1 keystroke/second. The system polls every 10 ms consuming 100 microseconds per poll. If a key is pressed, an additional 200 microseconds is consumed to process it. Let T1 = fraction of a second spent in polling and processing. In an interrupt-driven system, servicing an interrupt and processing takes 1 ms total. Let T2 = fraction of a second spent servicing interrupt and processing. The ratio T1/T2 is ___ (Rounded off to one decimal place)

Answer: 10.2Concept -- Polling vs Interrupt-Driven I/O (from Patterson and Hennessy; Silberschatz):Polling (T1): The system polls every 10 ms, so in 1 second it polls 1000/10 = 100 times. Each poll takes 100 microseconds. In 1 second: 100 * 100 us = 10,000 us = 10 ms spent polling. Additionally, 1 keystroke is pressed per second, so processing one keystroke: 200 us. T1 = 10,000 + 200 = 10,200 us per second = 10,200/1,000,000 = 0.0102 fraction.Interrupt-Driven (T2): 1 interrupt per second, each taking 1 ms = 1000 us. T2 = 1000 us/second = 0.001 fraction.Ratio T1/T2 = 10,200 / 1,000 = 10.2.

GATE-CS is a competitive examination conducted in India. This question is from the 2023 GATE-CS Computer Organization and Architecture paper.

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