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Process Ring Simulator Log for joe speigle generated Tue Mar 09 20:04:24 GMT 2004

code: code for the program
one: default configuration
two: Change After fork from parent to child
three: Change After fork from parent to either
four: Change After fork from parent to random
five: Change Choose Process from FCFS to Random
six: Change Scheduling from no preempt to round robin with a quantum of 5 and Choose Process from FCFS to Random
seven: Repeat the experiment above with a quantum of 2 and see if it behaves differently
eight: Change Print Atomic to Print Not Atomic with probability 0.1
nine: Insert a wait(NULL) call before the fprintf statement
ten: Change Print Atomic to Print Not Atomic with probability 0.1 and insert a wait(NULL) call before the fprintf statement

code

pipe(fd);
dup2(fd[0],0);
dup2(fd[1],1);
close(fd[0]);
close(fd[1]);
for(i=1;i<nprocs;i++) {
   pipe(fd);
   if (childpid = fork()) {
      dup2(fd[1],1);
   }
   else {
      dup2(fd[0],0);
   }
   close(fd[0]);
   close(fd[1]);
   if (childpid)
      break;
}
fprintf(stderr,"This is process %d with parent %d\n",getpid(),getppid());
-->

Ring of Processes Simulation

default configuration

Tue Mar 09 20:05:07 GMT 2004

Gantt Chart

Output for Ring of Processes
After fork: parent, Choose Process: FCFS, Scheduling: no preempt, Print Atomic
This is process 100 with parent 1
>>>This is process 101 with parent 1
This is process 102 with parent 1
This is process 103 with parent 1
This is process 104 with parent 1

Change After fork from parent to child

Tue Mar 09 20:12:08 GMT 2004

Gantt Chart
Tue Mar 09 20:11:33 GMT 2004

Output for Ring of Processes
After fork: child, Choose Process: FCFS, Scheduling: no preempt, Print Atomic
This is process 104 with parent 103
This is process 100 with parent 1
>>>This is process 101 with parent 1
This is process 102 with parent 1
This is process 103 with parent 1

Change After fork from parent to either

Output for Ring of Processes
After fork: either, Choose Process: FCFS, Scheduling: no preempt, Print Atomic
This is process 100 with parent 1
>>>This is process 101 with parent 1
This is process 104 with parent 103
This is process 102 with parent 1
This is process 103 with parent 1

Output for Ring of Processes
After fork: either, Choose Process: FCFS, Scheduling: no preempt, Print Atomic
This is process 100 with parent 1
>>>This is process 102 with parent 101
This is process 101 with parent 1
This is process 104 with parent 103
This is process 103 with parent 1

Output for Ring of Processes
After fork: either, Choose Process: FCFS, Scheduling: no preempt, Print Atomic
This is process 102 with parent 101
This is process 100 with parent 1
>>>This is process 101 with parent 1
This is process 104 with parent 103
This is process 103 with parent 1

change after fork from parent to random

Gantt Chart

Output for Ring of Processes
After fork: random, Choose Process: FCFS, Scheduling: no preempt, Print Atomic
This is process 100 with parent 1
>>>This is process 104 with parent 103
This is process 101 with parent 1
This is process 102 with parent 1
This is process 103 with parent 1

Output for Ring of Processes
After fork: random, Choose Process: FCFS, Scheduling: no preempt, Print Atomic
This is process 100 with parent 1
>>>This is process 101 with parent 1
This is process 102 with parent 1
This is process 103 with parent 1
This is process 104 with parent 1

Change Choose Process from FCFS to Random

Tue Mar 09 21:11:32 GMT 2004

Gantt Chart

Output for Ring of Processes
After fork: parent, Choose Process: Random, Scheduling: no preempt, Print Atomic
This is process 100 with parent 1
>>>This is process 101 with parent 1
This is process 102 with parent 1
This is process 103 with parent 1
This is process 104 with parent 1

Change Scheduling from no preempt to round robin with a quantum of 5 and Choose Process from FCFS to Random

Tue Mar 09 20:36:28 GMT 2004

Gantt Chart

Output for Ring of Processes
After fork: parent, Choose Process: Random, Scheduling: RR quantum 5, Print Atomic
This is process 100 with parent 1
>>>This is process 101 with parent 1
This is process 102 with parent 1
This is process 103 with parent 1
This is process 104 with parent 1

Repeat the experiment above with a quantum of 2 and see if it behaves differently

Tue Mar 09 20:41:08 GMT 2004

Gantt Chart

Output for Ring of Processes
After fork: parent, Choose Process: Random, Scheduling: RR quantum 2, Print Atomic
This is process 100 with parent 1
>>>This is process 101 with parent 1
This is process 102 with parent 1
This is process 103 with parent 102
This is process 104 with parent 103

Change Print Atomic to Print Not Atomic with probability 0.1.

Tue Mar 09 20:47:20 GMT 2004

Gantt Chart

Output for Ring of Processes
After fork: parent, Choose Process: FCFS, Scheduling: no preempt, Print Not Atomic 0.1
TThis is process 101 his is process 100 wiTwith pareth parent 1
>>>This is process 103his nt 100
Thi with parent 102
iss is process 104 with parent 1 process 102 03
with parent 101
Tue Mar 09 20:48:16 GMT 2004

Gantt Chart

Output for Ring of Processes
After fork: parent, Choose Process: FCFS, Scheduling: no preempt, Print Not Atomic 0.1
This is process 100 with parThis is procesent 1
>>>Ths This is101 This is process 104 with parent 103is is proc with parent 100
ess 103 with parent 102
process 102 with parent 101

Output for Ring of Processes
After fork: parent, Choose Process: FCFS, Scheduling: no preempt, Print Not Atomic 0.1
This iTs processThis ish 100This is process 103 with pris is process 101 witThis parocwih parent is procentess 102 with parent 101
th parent 100
1
>>>ess 104 102
with parent 103

Insert a wait(NULL) call before the fprintf statement

>>>
pipe(fd);
dup2(fd[0],0);
dup2(fd[1],1);
close(fd[0]);
close(fd[1]);
for(i=1;i<nprocs;i++) {
   pipe(fd);
   if (childpid = fork()) {
      dup2(fd[1],1);
   }
   else {
      dup2(fd[0],0);
   }
   close(fd[0]);
   close(fd[1]);
   if (childpid)
      break;
}
wait(NULL);
fprintf(stderr,"This is process %d with parent %d\n",getpid(),getppid());
-->
Tue Mar 09 20:52:01 GMT 2004

Gantt Chart

Output for Ring of Processes (modified)
After fork: parent, Choose Process: FCFS, Scheduling: no preempt, Print Atomic
This is process 104 with parent 103
This is process 103 with parent 102
This is process 102 with parent 101
This is process 101 with parent 100
This is process 100 with parent 1
>>>

Change Print Atomic to Print Not Atomic with probability 0.1 and insert a wait(NULL) call before the fprintf statement.

Tue Mar 09 20:57:41 GMT 2004

Gantt Chart

Output for Ring of Processes (modified)
After fork: parent, Choose Process: FCFS, Scheduling: no preempt, Print Not Atomic 0.1
This is process 104 with parent 103
This is process 103 with parent 102
This is process 102 with parent 101
This is process 101 with parent 100
This is process 100 with parent 1
>>>

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