1
GATE CSE 2011
+2
-0.6
Consider the following table of arrival time and burst time for three processes $$P0,P1$$ and $$P2$$.
Process Arrival Time Burst Time
P0 0 ms 9 ms
P1 1 ms 4 ms
P2 2 ms 9 ms

The pre-emptive shortest job first scheduling algorithm is used. Scheduling is carried out only a arrival or completion of processes. What is the average waiting time for the three processes?

A
$$5.0$$ $$ms$$
B
$$4.33$$ $$ms$$
C
$$6.33$$ $$ms$$
D
$$7.33$$ $$ms$$
2
GATE CSE 2009
+2
-0.6
In the following process state transition diagram for a uniprocessor system, assume that there are always some processes in the ready state: Now consider the following statements:
$$1.\,\,\,$$ If a process makes a transition $$D,$$ it would result in another process making transition $$A$$ immediately.
$$2.\,\,\,$$ $$A$$ process $${P_2}$$ in blocked state can make transition $$E$$ while another process $${P_1}$$ is in running state.
$$3.\,\,\,$$ The $$OS$$ uses preemptive scheduling.
$$4.\,\,\,$$ The $$OS$$ uses non-preemptive scheduling. Which of the above statements are TRUE?

A
$$1$$ and $$2$$
B
$$1$$ and $$3$$
C
$$2$$ and $$3$$
D
$$2$$ and $$4$$
3
GATE CSE 2008
+2
-0.6
A process executes the following code
for (i = 0; i < n; i + +) fork ( ); 
The total number of child processes created is
A
$$n$$
B
$${2^n} - 1$$
C
$${2^n}$$
D
$${2^{n + 1}} - 1$$
4
GATE CSE 2008
+2
-0.6
Which of the following is/are true of the auto-increment addressing mode?
$${\rm I}.\,\,\,$$ It is useful in creating self-relocating code
$${\rm II}.\,\,\,$$ If it is included in an Instruction Set Architecture, then an additional $$ALU$$ is required for effective address calculation.
$${\rm III}.\,\,\,$$ The amount of increment depends on the size of the data item accessed
A
$${\rm I}$$ only
B
$${\rm II}$$ only
C
$${\rm III}$$ only
D
$${\rm II}$$ & $${\rm III}$$ only
GATE CSE Subjects
Discrete Mathematics
Programming Languages
Theory of Computation
Operating Systems
Digital Logic
Computer Organization
Database Management System
Data Structures
Computer Networks
Algorithms
Compiler Design
Software Engineering
Web Technologies
General Aptitude
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