4. How does the processor know which device has requested an interrupt?
4. How does the processor know which device has requested an interrupt?
Homework Answers
Answer)
An interrupt is the mechanism by which other modules, such as I/O and memory, may interrupt the normal sequencing of the processor, by which the processor is forced to look at other modules leaving the current operations. The processor/CPU has several interrupt lines and there is an interrupt controller chips which multiplex several devices and which CPU interrogates. Also there are software methods such as Polling wherein all the interrupts are serviced by branching to the same service program.
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4. How does the processor know which device has requested an
interrupt?
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A given processor requires 1000 cycles to perform a context switch and start an interrupt handler (and the same number of cycles to switch back to the program that was running when the interrupt occurred), or 500 cycles to poll an I/O device. An I/O device attached to that processor makes 150 requests per second, each of which takes 10,000 cycles to resolve once the handler has been started. By default, the processor polls every 0.5 ms if it is...
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A given processor requires 1000 cycles to perform a context switch and start an interrupt handler (and the same number of cycles to switch back to the program that was running when the interrupt occurred), or 500 cycles to poll an I/O device. An I/O device attached to that processor makes 150 requests per second, each of which takes 10,000 cycles to resolve once the handler has been started. By default, the processor polls every 0.5 ms if it is...
uestion 4 of a given program compiles to fewer dynamic instructions on processor Athan it does on processor and it has a lower Plon processor Athan en processor, then it fosteron processor Athan on processor B. True O False
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