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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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Replies to This Discussion

plz complete solution send kr dein

fil m

mujhy aik bat ki smjh ni a ri wo y k...bytes of  chunks ki bat ki assignment m or handouts m buses ki bat h. or CPU ka bi ni mention assignment m k kitni buses hen, bcz 32 bit CPU p to agr 16 bits buses drive ki hon to half ..krte

please help

https://api.ning.com/files/F-SGlqewfDVqxRd5IWQZ7dappjBbwueUH4xqjZgD...

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a = 10 %

b = 20 %

c = 0.001 %

q2

2.4%

please share solution

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koi solution mila? kisi ko...

plz cs501 solution plz

plz share your solution.

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