Operating Systems

Contains tutorial page and lessons for operating systems. breadcrumb depends on this.

SJF Tabular Method

In the previous article, we computed the average waiting time and average turnaround time for processes that are scheduled with First Come, First Serve (FCFS) algorithm using Tabular Method. Introduction In this post, we will compute average waiting time and average turnaround time for scheduled processes with another algorithm called Shortest Job First (SJF). You …

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FCFS Tabular Method

The usual method of computing average time, average wait time, turnaround time and average turnaround time for processes is to make a Gantt Chart and then compute these times.In this article, we explore another way to compute the average turn around time and average wait time for processes based on the same logic given by the …

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Page Table

Most OS allocate a page table for each process. A pointer to the page table is stored in the PCB of the process. When the dispatcher start a process, it must reload the user registers and define the correct hardware page table from the stored user page-table. The hardware page table can be implemented in …

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Memory Mapping Schemes

Memory mapping is a technique to bind user-generated addresses to physical addresses in the memory. This requires static binding or dynamic binding. CPU gets instruction from memory, and then decode the instruction during the instruction-execution cycle. The instruction also contains the memory address of operands that need to be fetched. The CPU finished the instruction …

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Storage Structure

Files are stored on random-access storage devices including hard disks, optical disks, and solid-state disks. The storage device can entirely be used as a file system or divided into many partitions. Each partition may or may not have a different file system. Storage devices are collected into RAID sets, that provides high availability and fault …

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File Type

The operating system should support the file system. If the OS does not recognize a file type then any operation on the file will not be successful. The files are given an extension to indicate the type of file separated by a period or a dot. For example, finance.java – A java program source code …

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File Concepts

To a user, the file is the smallest unit of storage on a computer system. The user performs file operations such as open, close, read, write and modify. They can create or delete files from the system. In this article, you will learn the basics of file and file system. File Concept Computer store information …

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Paging allows the physical address space of a process to be non-contiguous. It avoids the external fragmentation andthere is no need for compaction. Fragmentation problem affects the backing store (disk) of the main memory where processes are swapped in or out.The compaction is not possible due to the slow access speed of the backing store. …

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