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Frequently Asked Operating System interview questions and answers for freshers Page 7

(#M40029482) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. Define compactions.

A. Compaction is a process in which the free space is collected in a large memory chunk to make some space available for processes.

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(#M40029480) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. What is process migration?

A. It is the transfer of sufficient amount of the state of process from one machine to the target machine

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(#M40029479) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. What is SMP?

A. To achieve maximum efficiency and reliability a mode of operation known as symmetric
multiprocessing is used. In essence, with SMP any process or threads can be assigned to any
processor

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(#M40029476) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. What is pre-emptive and non-preemptive scheduling?

A. Preemptive scheduling: The preemptive scheduling is prioritized. The highest priority process should always be the process that is currently utilized. Non-Preemptive scheduling: When a process enters the state of running, the state of that process is not deleted from the scheduler until it finishes its service time

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(#M40029474) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. What is Marshalling?

A. The process of packaging and sending interface method parameters across thread or process boundaries.

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(#M40029473) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. What is cycle stealing?

A. We encounter cycle stealing in the context of Direct Memory Access (DMA). Either the DMA controller can use the data bus when the CPU does not need it, or it may force the CPU to temporarily suspend operation. The latter technique is called cycle stealing. Note that cycle stealing can be done only at specific break points in an instruction cycle.

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(#M40029472) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. Explain the meaning of mutex.

A. Mutex is the short form for Mutual Exclusion object. A mutex allows multiple threads for sharing the same resource. The resource can be file. A mutex with a unique name is created at the time of starting a program. A mutex must be locked from other threads, when any thread that needs the resource. When the data is no longer used / needed, the mutex is set to unlock.

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(#M40029471) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. What is a long term scheduler & short term schedulers?

A. Long term schedulers are the job schedulers that select processes from the job queue and load them into memory for execution. The short term schedulers are the CPU schedulers that select a process from the ready queue and allocate the CPU to one of them.

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(#M40029468) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. When is a system in safe state?

A. The set of dispatchable processes is in a safe state if there exists at least one temporal order in which all processes can be run to completion without resulting in a deadlock.

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(#M40029469) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. Explain the concept of the Distributed systems?

A. Distributed systems work in a network. They can share the network resources, communicate with each other

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