Explanation: When the process issues an I/O request it is placed in an I/O queue. I/O is a resource and it should be used effectively and every process should get access to it.

When the process issues are input output request?

(c) When a process issues an input/output request then it goes from running state to blocked state. When a process terminates itself it goes from running state to terminate state. A process cannot go to running state after completing its 1/0, it most go to ready state.

What is OS waiting time?

Waiting time - How much time processes spend in the ready queue waiting their turn to get on the CPU. ( Load average - The average number of processes sitting in the ready queue waiting their turn to get into the CPU.

What are the two steps of a process execution *?

Answer is "I/O Burst, CPU Burst"

What is the ready state of process?

Explanation: Ready state of the process means process has all necessary resources which are required for execution of that process when CPU is allocated. Process is ready for execution but waiting for the CPU to be allocated.

Basics of OS (I/O Structure)

18 related questions found

What is the difference between a process that is ready and a process that is waiting?

Ready: Process can continue. Wait: Process should wait some events and then continue.

What types of status can a process have?

The different Process States

READY - The process is waiting to be assigned to a processor. RUNNING - Instructions are being executed. WAITING - The process is waiting for some event to occur(such as an I/O completion or reception of a signal). TERMINATED - The process has finished execution.

Which of the following conditions must be satisfied to solve the critical section problem *?

A minimum of variable(s) is/are required to be shared between processes to solve the critical section problem. Semaphore is a/an to solve the critical section problem. If a process is executing in its critical section, then no other processes can be executing in their critical section.

Is a solution to the problem of indefinite blockage of low priority processes?

The solution to the problem of starvation is aging. Aging is a technique of gradually increasing the priority of processes that wait in the system for a long time.

Which process can be affected by other processes executing in the system?

Explanation: A cooperating process can be affected by other processes executing in the system. Also it can affect other processes executing in the system. A process shares data with other processes, such a process is known as a cooperating process. ... Critical section of the process is shared between multiple processes.

How does process scheduling work?

Process Scheduling is an OS task that schedules processes of different states like ready, waiting, and running. Process scheduling allows OS to allocate a time interval of CPU execution for each process. Another important reason for using a process scheduling system is that it keeps the CPU busy all the time.

What is process paging OS?

In Operating Systems, Paging is a storage mechanism used to retrieve processes from the secondary storage into the main memory in the form of pages. The main idea behind the paging is to divide each process in the form of pages. ... One page of the process is to be stored in one of the frames of the memory.

What is the total waiting time for process P2?

The turnaround time of P2 is 7 seconds because the process P2 have to wait for 2 seconds for the execution of P1 and hence the waiting time of P2 will be 2 seconds. After 2 seconds, the CPU will be given to P2 and P2 will execute its task. So, the turnaround time will be 2+5 = 7 seconds.

When the process issues an I O request * It is placed in an I O queue it is placed in a waiting queue it is placed in the ready queue it is placed in the job queue?

ANS : a) It is placed in an I/O queue. You might get confused with option a) and b) The reason why b) is not the answer because waiting queue is not specifically a queue. When the process issues an I/O request it will be waiting (corresponding action ) somewhere but where In the I/O queue.

When a user process issues an I O request the operating system assigns a buffer?

1. Single buffering: When a user process issues an I/O request, the O.S assigns a buffer in the system portion of main memory to the operation. In the block oriented devices, the techniques can be used as follows: Input transfers are made to the system buffer.

What happens to a process who invokes wait operation?

The wait operation suspends/blocks execution of the calling process if a certain condition is true. ... When the same condition becomes false, then the signal operation resumes execution of some process suspended after a wait on that condition, by placing it in the processor ready queue.

What is the major problem of priority scheduling algorithm?

In priority-based scheduling algorithms, a major problem is indefinite block, or starvation. A process that is ready to run but waiting for the CPU can be considered blocked. A priority scheduling algorithm can leave some low-priority processes waiting indefinitely.

What is short term scheduler?

The short-term scheduler (also known as the CPU scheduler) decides which of the ready, in-memory processes is to be executed (allocated a CPU) after a clock interrupt, an I/O interrupt, an operating system call or another form of signal.

What happens in a multilevel feedback scheduling algorithm?

In a multilevel queue-scheduling algorithm, processes are permanently assigned to a queue on entry to the system. ... Multilevel feedback queue scheduling, however, allows a process to move between queues. The idea is to separate processes with different CPU-burst characteristics.

What can be used to solve critical section problem for multiple processes?

Solution to the Critical Section Problem

• Mutual Exclusion. Mutual exclusion implies that only one process can be inside the critical section at any time. ...
• Progress. Progress means that if a process is not using the critical section, then it should not stop any other process from accessing it. ...
• Bounded Waiting.

Which of the following option is suitable when a process is executing in its critical section?

Ans: If one process is executing in its critical section then no other process is allowed to enter it critical section. This is called mutual exclusion.

When a process leaves a critical section and more than one process?

when a process leaves a critical section and more than one process is waiting, the selection of a waiting process is arbitrary. 7. ……………………. techniques can be used to resolve conflicts, such as competition for resources, and synchronize processes so that they can co-operate.

What is status of a process?

The status of a process tells you whether it is currently doing something or not. There are four statuses that a process can have: Running. Processes that are currently doing something (for example, a web browser loading a web page). Running processes are those that are actively using the processor (CPU).

What is a process What are attributes of a process?

The Process attributes refer to process characteristics such as data set size, kernel scheduling priority, the number of pages of memory, and the number of page faults. CPU Seconds The total CPU seconds spent on the process. ...