WORST FIT POLICY, AN INCOMING JOB IS PLACED IN THE LARGEST POSSIBLE...

3. Worst fit policy, an incoming job is placed in the largest possible hole of free space

Question 4. Types of scheduling?

- Scheduling of job is also an important part of any OS. It involves keeping track of

and deciding which job is to be executed

- Types of scheduling

 Deadline scheduling

 First in first out scheduling(FIFO)

 Round robin scheduling

 Shortest job first(STF) scheduling

 Shortest remaining time scheduling(SRT)

- More details about types of scheduling

 In deadline scheduling certains are scheduled to be completed by a

specifir time or deadline. Deadline scheduling can be very complex

requiring substantial overhead in resource management

 FIFO scheduling: processes are dispatched according to their

arrival time in the ready queue. This type of

 Round robin scheduling is similar to FIFO scheduling but the

difference lies in that each job is given a slice of CPU time

 SJF scheduling: shorter jobs are more favoured than longer one.

SJF selects job that ensures the next jobs will complete & leave the

sys as soon as possible

 SRT scheduling: the job will the smallest estimated remaining run

time is executed first. In SRT, a running job may be replaced by a

new job with a shorter estimated run time

Chapter 8: MEMORY MANAGEMENT.

Question 1. Virtual Storage System?

- Instructions and data not currently needed might even be stored on the disk and

thus free up a portion memory

- Virtual storage systems have evolved to meet these needs. Virtual storage systems

allow programs to be as large as necessary, even larger that the physical storage

capacity of the computer

- Translating the user’s view of the program into the physical reality of computer

storage is one of the major task performed by virtual memory OS like IBM’s MVS

and digital VMS

- Virtual storage system included non paged systems

Paged systems

Chapter 9: NETWORKING.

Question 1. Types of network layout?

Network topology is the name given to the various types of network layout