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October 6, 2023UGC NET CS 2015 June Paper-3
October 6, 2023UGC NET CS 2015 June Paper-3
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Question 5
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The CPU of a system having 1 MIPS execution rate needs 4 machine cycles on an average for executing an instruction. The fifty percent of the cycles use memory bus. A memory read/ write employs one machine cycle. For execution of the programs, the system utilizes 90 percent of the CPU time. For block data transfer, an IO device is attached to the system while CPU executes the
background programs continuously. What is the maximum IO data transfer rate if programmed IO data transfer technique is used?
background programs continuously. What is the maximum IO data transfer rate if programmed IO data transfer technique is used?
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500 Kbytes/sec
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2.2 Mbytes/sec
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125 Kbytes/sec
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250 Kbytes/sec
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Question 5 Explanation:
Given, CPU speed 10 6 instruction/sec
1 CPU instruction = 4 machine cycles
CPU utilization = 90%
Programmed IO: each byte transfer requires 4 cycles (instructions), in status, check status branch, R/W data in memory maximum data transfer rate,
1 CPU instruction = 4 machine cycles
CPU utilization = 90%
Programmed IO: each byte transfer requires 4 cycles (instructions), in status, check status branch, R/W data in memory maximum data transfer rate,
Correct Answer: D
Question 5 Explanation:
Given, CPU speed 10 6 instruction/sec
1 CPU instruction = 4 machine cycles
CPU utilization = 90%
Programmed IO: each byte transfer requires 4 cycles (instructions), in status, check status branch, R/W data in memory maximum data transfer rate,
1 CPU instruction = 4 machine cycles
CPU utilization = 90%
Programmed IO: each byte transfer requires 4 cycles (instructions), in status, check status branch, R/W data in memory maximum data transfer rate,
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