multiprogramming, Operating System

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how response times are reduced by allowing time sharing on top of multiprogramming

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Optimal replacement policy, The optimal replacement policy, called OPT, is ...

The optimal replacement policy, called OPT, is to evict the page which will be accessed farthest into the future. Since we can't predict the future precisely, we can't implement OP

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Parent and Child process communicate in unix A child and parent can interact through any of the normal  inter-process communication schemes (pipes, message queues, sockets, s

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Virtual file systems The file-system execution having of three major layers. The first layer is the file-system interface, based on the open, read, write and close calls and fi

Compare user threads and kernel threads, Compare user threads and kernel th...

Compare user threads and kernel threads. User threads:- User threads are supported above the kernel and are executed by a thread library at the user level. Thread creation

What is a semaphore, What is a semaphore? A semaphore 'S' is a synchron...

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