Process Scheduling for John Russo generated Mon Nov 07 13:57:15 EST 2011

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1 1 of 8 11/7/2011 2:04 PM Process Scheduling for John Russo generated Mon Nov 07 13:57:15 EST 2011 Process Scheduling Simulator version 1.100L288 by S. Robbins supported by NSF grants DUE and DUE See for simulator information. Java version 1.6.0_27 OS Windows 7 version Configuration File: logdir. logfn logfile.html imagename gifim user John Russo quiet portable true run myrun exp myexp Number of Run Files: name myrun comment This contains two types of processes algorithm SJF seed 5000 numprocs 10 firstarrival 0.0 interarrival constant 0.0 duration constant 100 cpuburst uniform 2 8 ioburst uniform basepriority 1.0 numprocs 10 firstarrival 0.0 interarrival constant 0.0 duration constant 100 cpuburst uniform ioburst uniform basepriority 1.0 Number of Experiment Files: name myexp comment This experiment contains 6 runs run myrun algorithm FCFS key "FCFS" run myrun algorithm SJF key "SJF" run myrun algorithm RR 1 key "RR 1"

2 2 of 8 11/7/2011 2:04 PM run myrun algorithm RR 5 key "RR 5" run myrun algorithm RR 10 key "RR 10" run myrun algorithm RR 15 key "RR 15" Experimental Run Information for 1 Run myrun: This contains two types of processes Seed: 0 Algorithm: SJF Group Processes First Arrival Interarrival Duration CPU Burst I/O Burst constant 0.00 constant uniform uniform constant 0.00 constant uniform uniform Experimental Runs For 1 Experiment Experiment Commentary Run Modifications myexp This experiment contains 6 runs myrun_1 algorithm FCFS key FCFS myrun_2 algorithm SJF key SJF myrun_3 algorithm RR 1 key RR 1 myrun_4 algorithm RR 5 key RR 5 myrun_5 algorithm RR 10 key RR 10 myrun_6 algorithm RR 15 key RR 15 Starting run from myrun_1 Starting to run events using FCFS 685 events done in 110 milliseconds Starting run from myrun_2 Starting to run events using SJF 685 events done in 105 milliseconds Starting run from myrun_3 Starting to run events using RR 1.00

3 3 of 8 11/7/2011 2:04 PM 4443 events done in 544 milliseconds Starting run from myrun_4 Starting to run events using RR events done in 156 milliseconds Starting run from myrun_5 Starting to run events using RR events done in 103 milliseconds Mon Nov 07 13:57:19 EST 2011 Starting run from myrun_6 Starting to run events using RR events done in 97 milliseconds Mon Nov 07 13:57:24 EST 2011 Entries Average Time CPU Name Key Time Processes Finished Throughput CST LA CPU I/O CPU I/O Utilization myrun_1 FCFS myrun_2 SJF myrun_3 RR myrun_4 RR myrun_5 myrun_6 RR RR Turnaround Time Waiting Time Name Key Average Minimum Maximum SD Average Minimum Maximum SD myrun_1 FCFS myrun_2 SJF myrun_3 RR myrun_4 RR myrun_5 RR myrun_6 RR

4 4 of 8 11/7/2011 2:04 PM Mon Nov 07 13:57:36 EST 2011 Gantt Chart for FCFS Mon Nov 07 13:57:43 EST 2011 Gantt Chart for SJF Mon Nov 07 13:57:51 EST 2011

5 5 of 8 11/7/2011 2:04 PM Gantt Chart for RR 1 Mon Nov 07 13:58:02 EST 2011 Gantt Chart for RR 5 Mon Nov 07 13:58:11 EST 2011

6 6 of 8 11/7/2011 2:04 PM Gantt Chart for RR 10 Mon Nov 07 13:58:15 EST 2011 Entries Average Time CPU Name Key Time Processes Finished Throughput CST LA CPU I/O CPU I/O Utilization myrun_1 FCFS myrun_2 SJF myrun_3 RR myrun_4 RR myrun_5 myrun_6 RR RR Turnaround Time Waiting Time Name Key Average Minimum Maximum SD Average Minimum Maximum SD myrun_1 FCFS myrun_2 SJF myrun_3 RR myrun_4 RR myrun_5 RR myrun_6 RR

7 7 of 8 11/7/2011 2:04 PM Mon Nov 07 13:58:22 EST 2011 Gantt Chart for RR 10 Mon Nov 07 13:58:31 EST 2011 Gantt Chart for RR 15 The shortest average wait time is the Shortest Job First. As the quantum increases for the RR then the turn-around-time as well as wait time decreases. Eventually, this will come close the First Come First Served, since the quantums will be large. This will more than likely happen up around a quantum of 25 or so.

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