CS501 Advance Computer Architecture  Assignment no.3 solution spring 2018

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Q 1. Suppose we have a 1.5-GHz CPU to which the following three I/O devices are connected:

 

1. Flash drive that can transfer data in 32-byte chunks with a maximum transfer rate of 16 MB/sec
2. DVD drive which can transfer data in 16-byte chunks with a maximum transfer rate of 16 MB/sec
3. Joystick that needs to be polled 50 times per second

 

Polling requires 300 instructions for each I/O device. Students are required to compute the percentage of CPU time required to poll each device.

 

 

Q 2. Instead of polling, we want to use interrupts for handling the DVD drive. Keeping in view the DVD drive to be active only 12% of the time, you are required to compute the percentage of CPU time for handling it.

 

Note: Interrupt and polling requires the same amount of instructions.

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