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# Assignment No.4

 Assignment No. 04 Semester: Spring 2015 CS501 - Advance Computer Architecture Total Marks: 20   Due Date:  05/08/2015 Instructions: Please read the following instructions carefully before submitting assignment: It should be clear that your assignment will not get any credit if:   The assignment is submitted after due date. The assignment is submitted by email. The submitted assignment does not open or file is corrupt. All types of plagiarism are strictly prohibited. It is in some format other than .doc (Microsoft Word).   Objectives: To learn and understand the basic concepts of CPU sharing between I/O devices. To learn about the dynamic properties of magnetic disk drive.    For any query about the assignment, contact at cs501@vu.edu.pk     Question                                                                                                          Marks 10    Consider a 64-bit, 50 MIPS CPU with which following I/O devices are attached.   A hard drive having a 32-bit bus and maximum transfer rate of 12 MB/sec. A DVD writer having a 32-bit bus with transfer rate of 1 MB/sec. A mouse having the polling frequency of 100 Hz.   Assume that one polling operation requires 12 instructions for each I/O device. You are required to calculate the percentage of CPU time required to poll each of the given devices.   Question 2                                                                                                       Marks 10       Suppose we have a magnetic disk with an average seek time of 3ms. The disk can transfer at a maximum rate of 30 MB/sec. If disk rotates at 18,000 rpm and the controller overhead is 0.5ms, then calculate the average time to read or write a data block of 1 MB.     Note: No assignment will be accepted after due date. BEST OF LUCK

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### Replies to This Discussion

64  bit processor hai and devices 32 bit is ka kuch socho friends?? answer ko kahien 2 per devide to nahi kerna ?? confused........ :(

1MB = 1024 Kb why all of you consider 250k

a.a guyz Q1: PART 1 ans 30.7% and part 2 answer: 2.56% kia ye theak hay or part 3 kia hay kisi ne kia?

yar is k koi fainal answer bta du plz jaldi sy time kam ha koi kis method sy kr ra ha koi kis sy answer correct kia ha wo btao jaldi.....

sub ki assignment galat hai i think koi b sahi solution nahi bta raha

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