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What is virtual memory?
A virtual memory is hardware technique where the system appears to have more memory that it actually does. This is done by time-sharing, the physical memory and storage parts of the memory one disk when they are not actively being used.
mohd_ismail21
- Mar 16th, 2010
Virtual memory is a non physical (intangible) memory created by the CPU to temporarily store the data for displaying purpose. Example: the website page you are seeing is not stored in physical memory it is stored in virtual memory and when you close the website page the memory is lost. RegardsIsmail
goksn
- Sep 6th, 2009
Virtual memory is a memory management technique used for handling programs/data files larger than the physical memory of the system.Op.system loads as much data as possible into its main memory (RAM)....
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Describe different job scheduling in operating systems?
Scheduling is the activity of the deciding when process will receive the resources they request.FCFS: --- FCSFS stands for First Come First Served. In FCFS the job that has been waiting the longest is served next.Round Robin Scheduling: ---Round Robin scheduling is a scheduling method where each process gets a small quantity of time to run and then it is preempted and the next process gets to run....
priya adak
- Sep 20th, 2011
job scheduling also called as long term scheduling....It select the process from these pool and load them into memory for execution..It controls the degree of multiprogramming....If the degree of mult...
thukral.rahul
- Jan 12th, 2010
Windows uses priority based pre-emptive CPU / Job scheduling algorithm.
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What are the major differences between windows XP and Windows 2000 operating systems?
gyanvendrarajput
- Aug 11th, 2008
Windows XP supports NTFS and FAT files but windows 2000 supports only FAT files.WinXP provides file lever security whereas Win 2000 does not.
saurabh
- Apr 3rd, 2006
Which one is better
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If a system has 128 MB RAM and 1 GB hard Disk, and a process decides to use its fully allotted Virtual Memory 2^32 - 2GB = 2 GB, how is it practically possible?. But this works in all machines. How?
00elton00
- Aug 5th, 2007
The above is possible due to the Paging. Both the Virtual Memory and the Physical Memory are broken down into pages of equal size, and a mapping, called the page table, is used to map virtual memory pages to physical memory pages.
Guest
- Jun 24th, 2006
Min virtual Memory size is 1.5 times of RAM (Exact RAM size + 11MB)Max Virtual Memory size is 3 times of RAM
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What is starvation and aging?
Starvation: Starvation is a resource management problem where a process does not get the resources it needs for a long time because the resources are being allocated to other processes. Aging: Aging is a technique to avoid starvation in a scheduling system. It works by adding an aging factor to the priority of each request. The aging factor must increase the request’s priority as time passes and...
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What is a Real-Time System?
A real time process is a process that must respond to the events within a certain time period. A real time operating system is an operating system that can run real time processes successfully
adeshgupta123
- Jul 24th, 2009
RTS like embedded system work in real time, like robort work on RTS. Windows CE is RTOS.
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What is the state of the processor, when a process is waiting for some event to occur?
Waiting state
00elton00
- Aug 5th, 2007
If the process is waiting for something to occur, then the process, and not the processor, should be in the waiting state.The processor would be scheduled to any other ready process, and if none is present, the the processor would be in the idle state.
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What is page fault?
manishtripathi
- Mar 11th, 2010
The number of times that data had to be retrieved from the page fileon the hard disk because it had been paged out ofphysical memory. Windows uses a page file storedon the hard disk to aug...
younus_syed
- Jun 26th, 2008
If an application requires more physical memory it uses swap memory. Page out means moving some data and address space of physical memory to hard disk.A page fault happens when a system tries to access data in memory that has been paged out to disk.
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Define task and TCB?
pbchaudhari
- Aug 26th, 2007
A Process Control Block (PCB, also called Task Control Block or Task Struct) is a data structure in the operating system kernel containing the information needed to manage a particular process. The PCB is "the manifestation of a process in an operating system"
amit
- Oct 16th, 2006
Task control block that hold all information related to task
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What is the main component of operating system?
gokulnithish
- Jun 8th, 2010
There are three main components:1. Control Programs 2. Sytem Service Programs 3. Utility Programs 1. Control Programs Control & maintain the operation of computer Initial program loader (IPL)...
rakesh trichy
- Oct 11th, 2008
There are three main components:1. Control programs2. Sytem Service Programs3. Utility programs
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What are the difference between FAT32 and NTFS?.
thukral.rahul
- Jan 12th, 2010
NTFS stands for new technology file system. It is an advancement over the FAT12, FAT16 and FAT32 versions of the file system used in windows earlier.In NTFS, theoritical it can store a file as large a...
viren_VRS73
- Aug 5th, 2008
NTFSOperting System - Windows 2000, Windows XP, Windows 2003 Server and Windows VistaMax Volume Size - 2TBMax Files on Volume - Nearly UnlimitedMax File Size - Limit Only by Volume SizeMax Clusters Nu...
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Interrupt "trap" what is this trap?
thukral.rahul
- Jan 12th, 2010
A Trap is a Software generated interrupt. A Trap is set to have occured when some exceptions occurs like - a process accessing a memory address outside it's address space would result in a trap which ...
maaz_qureshi
- Oct 24th, 2008
A trap is a software-generated interrupt, An interrupt is a hardware-generated change-of-flow within the system. An interrupt handler is summoned to deal with the cause of the interrupt; control i...
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Page File and Virtual Memory
Describe the relationship between a page file, and virtual memory on a Windows operating systems.
kumar1974
- Apr 17th, 2008
Virtual memory is the memory taken form hard disk.Swap: When the programme excuting in the main memory is completly shifted to Virtual Memory for the execution. Then it is called the Swaping.Paging: W...
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Why unix is more stable than windows?
rakesh trichy
- Oct 10th, 2008
Kernel Stability: "Both the UNIX kernel, and the design techniques it encourages, are renowned for stability. A system of several thousand servers must run reliably and without intervention to restart failed systems
rakesh trichy
- Oct 10th, 2008
Unix is more stable and does not go down as often as Windows does, therefore requires less administration and maintenance. Unix has greater built-in security and permissions features than Windows. it ...
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What is the meaning of Register and Main memory(RAM) ?
And give the difference between them
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Active Directory User Accounts
can we create Multiple User Accounts in Active Directory in a single shot? if So what is the command or tool used?
dashokkumar
- Oct 25th, 2013
You can create Bulk User Accounts in Active Directory using cmdlets, however these are not scalable to the entire organization provided all your technicians have expert scripting knowledge. Alternativ...
Sanjay Mishra
- Oct 25th, 2013
You can create multiple user account by using dsadd command.
Create batch file put all user name and require field and execute it. -
What is use of ntbootdd.sys file?
mcsepramod
- May 31st, 2008
The Ntbootdd.sys file is not required if the SCSI adapter has INT 13h BIOS support. The Ntbootdd.sys file is a renamed copy of the SCSI device driver located in the root folder. This file is also used with Windows NT Startup floppy disks.
Deepak Bansal
- Sep 11th, 2006
This file is used when you have a scsi drive, basically this file stores the scsi driver if it is not available with windows os
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What do you mean by deadlock?
Deadlock is a situation where a group of processes are all blocked and none of them can become unblocked until one of the other becomes unblocked.The simplest deadlock is two processes each of which is waiting for a message from the other.
ramesh kattamuri
- Sep 17th, 2007
Deadlock is a situation know as permanent waiting state.where a group of processes are blocked and none of them can become unblocked until one of the other becomes unblocked.
snehankita
- Jun 13th, 2007
Deadlock can be defined as a permanent blocking of the processess which are either competing for resources or communicating with each other.
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Give an example of microkernel?
Amoeba, WinNT, Minix
Windows Interview Questions
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