Process-Consumer Simulator
Contents
1. 9 Click the Open Log button in the left column about two thirds down the Process Consumer Simulation window to open a log file After you have clicked this button its name will change to Close Log 10 The button beginning with the label Failure Type in the second column from the left toward the bottom of the window allows you to toggle between an Internal Inconsistency failure or External Inconsistency failure If necessary click this button so that it is an Internal Inconsistency failure 11 Now click the green button labeled One Run at the right hand side of the window 12 Click on the green button labeled Show Local Log at the left hand side of the window A table opens up in a separate window with statistics for the simulation At the bottom of the log is a table with statistics for each line of code executed by the producer and the consumer Appearing in red text is the internal inconsistency failure with a line such as the following Items Produced Items Consumed 2 3 Number Buffered 13 Return to the Producer Consumer Simulation window and select the Failure Type button so that it is an External Inconsistency failure Click the green button labeled 10 Runs 14 Click on the button labeled Show Local Log A table opens up in a separate window with Statistics for each of the two simulations performed at Steps 11 and 13 2 This document was derived from simulation software created by Steve Robbins which was suppo2. This document was derived from simulation software created by Steve Robbins which was supported by NSF DUE 9752165
3. CPSC2800 Introduction to Operating System Simulation Lab Series Simulation Lab 2 Process Consumer Simulator Submission to the bb4 utc edu is due on midnight of XXX Name your submission file with firstName_lastName_Simulation2 Turn In Include your experiences and answers to Part I question 1 to 5 and Part II question 1 to 5 Include the following at the beginning of your report e Name e UTCID e Course Number and Name e Semester e Lab Name and Number e spent hours and minutes to finish this hands on lab e Ihave percent finish this lab e expect A B C or F of this lab e This lab helps me to understand process scheduling Choose a number to indicate how much the lab is helpful 1 2 3 4 5 less helpful more helpful Part I Instructions Download the Producer Consumer simulator and extract the zip file This produces a folder named pe The user manual for this simulator pe_doc html is included in this folder It is strongly suggested that you carefully read through this documentation describing how the simulator operates prior to beginning this section Steps Perform the following steps using the producer consumer simulator 1 Inthe pe directory execute runpc UNIX Linux Mac OS X or runpc bat Windows This will start the producer consumer simulator 2 Click on the green button labeled One Run in the right hand side of the Producer Consumer Simulation window This will start the sim
4. efully read through 3 This document was derived from simulation software created by Steve Robbins which was supported by NSF DUE 9752165 CPSC2800 Introduction to Operating System Simulation Lab Series this documentation describing how the simulator operates It is also recommended that you complete Part I as well The following activities allow you to manually step through the producer and consumer processes to ensure a context switch occurs while the producer is executing its critical section You will perform this by using a combination of the 10 Cycles and One Cycle buttons that allow you to step through code instructions in the producer and consumer processes Initially you will use these buttons to have the producer run its code segment almost two times stopping while in the middle of its critical section for the second time Steps 1 In the pe directory execute runpe UNIX Linux Mac OS X or runpe bat Windows This will start the producer consumer simulator 2 Click the 10 Cycles button several times so that the producer complete its first time quantum The simulator will switch from the producer being active to the consumer 3 Next click the Switch Processes button to switch back to the producer process 4 Using a combination of the 10 Cycles and One Cycle buttons ensure that the producer has entered one item in the buffer and proceed to the instruction RI counter for the second time 5 Click One Cycle to st
5. ep to the RL R1 1 instruction 6 Click the Switch Processes button in the fourth column at the bottom of the window to switch to the consumer process This has the effect of moving the producer process off of the CPU while it is in the middle of its critical section 7 Using a combination of the 10 Cycles and One Cycle buttons allow the consumer to proceed at least until it decrements the value of counter You may allow it to run for the remainder of its time quantum or until it yields control of the CPU to the producer 8 Switch back to the producer process and click the One Cycle button twice so that it completes its critical section You have now ensured a race condition on the shared variable counter It may take you a few attempts at the above steps to cause a race condition on the data counter 1 What is the value of counter after completing Step 4 a 0 b 1 c 2 d 3 4 This document was derived from simulation software created by Steve Robbins which was supported by NSF DUE 9752165 CPSC2800 Introduction to Operating System Simulation Lab Series 2 What is the value of counter after completing Step 7 a 0 b 1 c 2 d 3 3 What is the value of counter after completing Step 8 a 0 b 1 c 2 d 3 4 What is the correct value of counter after completing Step 8 a 0 b 1 c 2 d 3 5 Identify the type of failure that has occurred a Internal inconsistency failure b External inconsistency failure 5
6. rted by NSF DUE 9752165 CPSC2800 Introduction to Operating System Simulation Lab Series 15 Return to the Producer Consumer Simulation window and click the Close Log button then the pink Quit button You have created a file called log html in the pe directory 16 Submit your log file log html to your instructor per his or her instructions Questions Answer the following questions after completing Steps 1 16 above 1 What process is initially active after completing Step 1 a Producer b Consumer 2 The purple button labeled Quantum is followed by a number specifying how many cycles in a quantum What is this value a 10 b 100 c 90 d 5000000 3 Next to each instruction for the Producer and Consumer processes is the number of cycles required by that instruction How many cycles is required for the statement while counter n a 1 b 7 c 8 d 10 4 What is the value of Quantum Remaining in the lower right hand corner of the main window after performing Step 3 a 100 b 99 c 0 d 80 5 What is the value of Quantum Remaining in the lower right hand corner of the main window after performing Step 4 a 80 b 79 c 78 d 100 Part II Instructions If you have not already done so download the Producer Consumer simulator and extract the zip file This produces a folder named pe The user manual for this simulator pce_doc html is included in this folder It is strongly suggested that you car
7. ulator for a single run the simulator stops upon either an internal or external failure condition 3 Click the Reset button in the bottom row of buttons in the second column from the left to reset the simulator At the bottom right hand side of the window is the number of cycles remaining in the quantum appears as Quantum Remaining 100 Click the 1 This document was derived from simulation software created by Steve Robbins which was supported by NSF DUE 9752165 CPSC2800 Introduction to Operating System Simulation Lab Series green button labeled 10 Cycles Click the 10 Cycles again Do not click the 10 Cycles button more than twice The value of Quantum Remaining is decrementing and the code statements in the producer are being performed 4 Click the green button labeled One Cycle three times The value of Quantum Remaining is not changing yet code statements in the producer are still being performed That is by clicking the One Cycle button each cycle is being used to execute code statements yet the cycles do not count towards the time quantum of the scheduled process 5 Click the One Run button again to run the simulator until a failure condition occurs 6 Exit the simulator using the pink Quit button in the upper right corner of the main window 7 Edit the file pcconfig in the pe folder and change the value of user from New User to your name Save the configuration file 8 Execute the simulator again as in Step 1
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