Assignment on Fork System Call, Operating System

Assignment Help:
Parent process P creates three child processes, C1, C2, and C3. Each child process executes a
memory and CPU intensive application of your choice. Your choice should be such that the children
execute for considerable periods of time and acquire considerable amount of memory (say, on the stack
or on the heap).
The parent process P wants to periodically monitor the status of its children to determine: • are each of the three children, C1, C2, and C3 alive? • what is the CPU utilization of each child process? • what is the memory usage of each child process?
Note that P received the PIDs of C1, C2, C3, during the fork() system call. In order to obtain the
periodic status, P does the following:
(a) It periodically forks a child, M, creates a pipe with it, and redirects the standard output of M to
the pipe (that is, when M writes to stdout it can be read by P from the pipe). The monitoring
interval can be implemented with the sleep command.
(b) Once M is created, it chooses a suitable system call from the exec family to execute the “ps”
command with suitable arguments (thereby writing its output into the pipe with its parent P).
Thereafter M terminates.
(c) P reads the output of M from the pipe, finds the entries corresponding to C1, C2, and C3 (that
is, if they are alive) and extracts their respective CPU and memory utilizations (in percentage,
as reported by “ps”). P writes the timestamp and the information extracted in the terminal.
(d) When P finds that C1, C2, and C3 are not present in the listing of “ps”, it writes “All children
have terminated” and stops.
Please study the syntax and arguments of “ps” carefully so that you execute it with the optimal set of
arguments.
You need to submit the following:
1. The C program for P
2. The applications run by C1, C2, C3. These must be made available in a form that the TA can
run your system in your absence

Related Discussions:- Assignment on Fork System Call

Explain the protection problems, Q. In some systems a subdirectory is able...

Q. In some systems a subdirectory is able to be read and written by an authorized user just as ordinary files can be. a. Explain the protection problems that could arise. b.

Basic server model, Suppose we want to program a Web server; we could easil...

Suppose we want to program a Web server; we could easily do so without using concurrency, as follows: while(true) wait connection read from socket and parse url look up url cont

Benefits and drawbacks of batch system, Q. Benefits and Drawbacks of Batch ...

Q. Benefits and Drawbacks of Batch System? Benefits of Batch System: Move much of the work of operator to computer. Increased performance as it was possible for j

Write a short note on file organization and access, Write a short note on f...

Write a short note on file organization and access. There are three methods to access files 1Record Access 2Sequential Access 3Random Access The record access

Garbage collection, The dynamic memory allocator is a layer between the app...

The dynamic memory allocator is a layer between the application and the OS, managing heap objects. When a program requests memory from the allocator (via malloc(), for instance), t

Explain file allocation using i nodes, File allocation using I nodes. T...

File allocation using I nodes. This method is used to decrease the size of the table in the above method. Every file will have an I-node list. Allow a file have 15 pointers a

How does ntfs handle data structures, Q. How does NTFS handle data structur...

Q. How does NTFS handle data structures? How does NTFS recover from a system crash? What is guaranteed after a recovery takes place? Answer: In NTFS all file-system data stru

What are the various page replacement algorithms, What are the various page...

What are the various page replacement algorithms used for page replacement? FIFO page replacement Optimal page replacement LRU page replacement LRU approximat

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd