CS501 Assignment # 02 Solution (17 January 2018)
Advance Computer Architecture (CS501) Assignment # 02
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Total marks = 20
Deadline:
17 January 2018
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Please carefully read the
following instructions before attempting assignment.
RULES FOR MARKING
It should be clear that your
assignment would not get any credit if:
You should concern the recommended
book to clarify your concepts as handouts are not sufficient.
You are supposed to submit
your assignment in .doc or docx format only.
Any
other formats like scan images, PDF, zip, rar, ppt and bmp etc. will not be
accepted.
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NOTE
No assignment will be accepted
after the due date via email in any case
(load shedding or internet malfunctioning etc). Hence refrain from uploading assignment
in the last hour of deadline. It is recommended to upload solution file at
least two days before its closing date.
For any query, feel free to email at:
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Assignment:
Suppose
we have a Processor XYZ with the following specifications:
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Processor
speed is 1 GHz.
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It
takes 2500 clock cycles to carry out a context switch followed by starting an Interrupt
Service Routine (ISR).
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To
execute an ISR, 5000 cycles are required.
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The
device makes 100 interrupt requests per second.
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Moreover
when there are no interrupts, the processor polls for every 0.7 milli-sec and
300 cycles are required to poll an I/O device.
Students are required to calculate:
a.
No
of cycles/sec the processor spends for handling I/O provided interrupts are
used only.
b.
Percentage
of CPU time used in interrupts handling.
c.
No
of cycles/sec spent in I/O when polling is also used with interrupts.
d.
How
frequently the processor polls so that it incurs the same overhead as interrupts.
The End
