Consider the following memory layout of three processes: Process A, Process B, and Process C. For simplification, we assume no use of virtual memory; thus, all three processes are represented by programs that are fully loaded in main memory as shown below. In addition, there is a small dispatcher program that switches the processor from one process to another. Address Main Memory 0 1000 6000 10000 16000 20000 30000 38000 Dispatcher Process A Process B Process C The following table shows the traces of each of the processes during the early part of their execution. The first 8 instructions executed in processes A and B are shown. Process C executes 3 instructions, and we assume that the 3rd instruction invokes an I/O operation for which the process must wait for 3 instruction cycles for the I/O operation to be completed. Trace of Process A 10,000 10,001 10,002 10,003 10,004 10,005 10,006 10,007 ▸ Trace of Process B 20,000 20,001 20,002 20,003 20,004 20,005 20,006 20,007 Trace of Process C - 30,000 30,001 30,002 35,000 35,001 35,002 35,003 Trace of Dispatcher 1,000 1,001 1,002 1,003 Assume the following sequence of process execution: ABC-A BC. Draw these traces from the processor's point of view assuming that the OS only allows a process to continue execution for a maximum of 4 instruction cycles, after which it is interrupted to prevent any single process from monopolizing processor time.
Consider the following memory layout of three processes: Process A, Process B, and Process C. For simplification, we assume no use of virtual memory; thus, all three processes are represented by programs that are fully loaded in main memory as shown below. In addition, there is a small dispatcher program that switches the processor from one process to another. Address Main Memory 0 1000 6000 10000 16000 20000 30000 38000 Dispatcher Process A Process B Process C The following table shows the traces of each of the processes during the early part of their execution. The first 8 instructions executed in processes A and B are shown. Process C executes 3 instructions, and we assume that the 3rd instruction invokes an I/O operation for which the process must wait for 3 instruction cycles for the I/O operation to be completed. Trace of Process A 10,000 10,001 10,002 10,003 10,004 10,005 10,006 10,007 ▸ Trace of Process B 20,000 20,001 20,002 20,003 20,004 20,005 20,006 20,007 Trace of Process C - 30,000 30,001 30,002 35,000 35,001 35,002 35,003 Trace of Dispatcher 1,000 1,001 1,002 1,003 Assume the following sequence of process execution: ABC-A BC. Draw these traces from the processor's point of view assuming that the OS only allows a process to continue execution for a maximum of 4 instruction cycles, after which it is interrupted to prevent any single process from monopolizing processor time.
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Use the information to solve Part A please. No
Transcribed Image Text:Consider the following memory layout of three processes: Process A, Process B, and Process C.
For simplification, we assume no use of virtual memory; thus, all three processes are represented
by programs that are fully loaded in main memory as shown below. In addition, there is a small
dispatcher program that switches the processor from one process to another.
Address Main Memory
0
1000
6000
10000
16000
20000
30000
38000
Dispatcher
Process A
Process B
Process C
The following table shows the traces of each of the processes during the early part of their
execution. The first 8 instructions executed in processes A and B are shown. Process C executes
3 instructions, and we assume that the 3rd instruction invokes an I/O operation for which the
process must wait for 3 instruction cycles for the I/O operation to be completed.
Transcribed Image Text:Trace of Process A
10,000
10,001
10,002
10,003
10,004
10,005
10,006
10,007
▸
Trace of Process B
20,000
20,001
20,002
20,003
20,004
20,005
20,006
20,007
Trace of Process C
-
30,000
30,001
30,002
35,000
35,001
35,002
35,003
Trace of Dispatcher
1,000
1,001
1,002
1,003
Assume the following sequence of process execution: ABC-A BC.
Draw these traces from the processor's point of view assuming that the OS only allows a process to
continue execution for a maximum of 4 instruction cycles, after which it is interrupted to prevent any
single process from monopolizing processor time.
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