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Operating System Articles
Found 1,708 articles
Multiprocessor and Multicore Organization
There are two methods for creating systems of computers with multiple processors or processor cores: multiprocessor organization and multicore organization. Both strategies aim to boost a computer's processing power by enabling it to handle several tasks simultaneously. Several separate processors linked by a communication network make up a multiprocessor system. Each processor can carry out a unique set of instructions and has separate local memory. The throughput of the entire system can be increased by these processors working on several tasks concurrently. In contrast, multicore systems achieve similar goals using multiple cores within a single processor chip. What ...
Read MoreN-Step-SCAN disk scheduling
N-Step-SCAN (also called N-Step-LOOK) is a disk scheduling algorithm that improves upon the traditional SCAN algorithm by introducing a parameter N that limits the number of requests processed in one direction before changing direction. Unlike SCAN, which continues moving in one direction until no more requests exist in that direction, N-Step-SCAN processes exactly N requests before reversing direction. This approach provides better control over disk arm movement and can reduce starvation compared to pure SCAN scheduling. How N-Step-SCAN Works The algorithm operates by maintaining the current disk arm position and processing requests in batches of size N ...
Read MoreLock Variable Synchronization Mechanism
Lock variable synchronization is a fundamental mechanism in concurrent programming that ensures multiple threads or processes can safely access shared resources without encountering race conditions or data corruption. It provides a way to control execution order, allowing threads to have exclusive access to critical sections when needed. In this article, we will explore lock variable synchronization, its use cases, and demonstrate its implementation with a practical C example. How Lock Variable Synchronization Works The core concept involves using a shared variable (called a lock or mutex - mutual exclusion) to control access to critical code sections. A ...
Read MoreNucleus Operating System
The Nucleus is an RTOS that was developed by Mentor Graphics Embedded Software Division, a Siemens Business that supports 32-bit and 64-bit embedded system platforms. The Nucleus operating system (OS) is mainly intended for use in real-time embedded systems in medical, aerospace, industrial, consumer, and Internet of Things (IoT) applications. In this article, we will explore Nucleus Operating System, its components, and features as well. Nucleus Operating System The Nucleus OS was initially introduced in 1993. The latest version, 3.x, offers various features, including 64-bit support, safety certification, power management, and a process model. It also supports ...
Read MoreNumerical on Disk
Numerics are essential for understanding the complex facets of disk storage since they offer a hands-on, practical method to grasp fundamental concepts. By exploring numerical examples, we can investigate how disk capacity, performance, and utilization are calculated, helping us understand the fundamentals of efficient storage management. Example − Consider a cloud service provider that offers file storage access to its customers. The service provider stores customer files, including documents, photos, and multimedia content, on disk storage. The disk storage system is built to support high data throughput and offers reliable file access. Disk Structure ...
Read MoreNumerical on LRU, FIFO
In this article, we will explore LRU (Least Recently Used) and FIFO (First In First Out) page replacement algorithms through detailed numerical examples, examining their step-by-step execution and practical applications. Least Recently Used Algorithm The LRU (Least Recently Used) algorithm is a popular page replacement strategy used in operating systems and cache management. When the cache is full and a new page needs to be loaded, LRU replaces the page that has been accessed least recently, based on the principle that recently accessed pages are more likely to be accessed again. LRU Numerical Example Given: Cache ...
Read MoreImplementing Mandatory Access Control with SELinux or AppArmor in Linux
Linux has built-in support for two types of Mandatory Access Control (MAC) systems: SELinux and AppArmor. Both systems add an additional layer of access control to the default Discretionary Access Control (DAC) that comes with Linux. In this article, we delve into the implementation of both systems, offering practical examples and their respective outputs. Understanding SELinux and AppArmor SELinux (Security-Enhanced Linux) is a Linux kernel security module that provides a mechanism for supporting access control security policies. It is a highly flexible MAC system that assigns labels to every object in the system (files, directories, ports, etc.) and ...
Read MoreInstall and Configure Caching-Only DNS Server in RHEL/CentOS 7
DNS (Domain Name System) plays a crucial role in translating domain names into IP addresses, allowing users to access websites using human-readable URLs. To enhance DNS performance and reduce network latency, implementing a caching-only DNS server can significantly improve the speed and efficiency of DNS lookups. In this article, we will guide you through the process of installing and configuring a caching-only DNS server in RHEL/CentOS 7. Prerequisites Before proceeding, ensure that you have the following − A server running RHEL/CentOS 7. Root or sudo access to the server. Basic knowledge of the Linux command line. ...
Read MoreInstall EHCP in RHEL/CentOS/Fedora and Ubuntu/Debian/Linux Mint
EHCP (Easy Hosting Control Panel) is a powerful and user-friendly web hosting control panel that simplifies the process of managing web servers and hosting websites. It provides a comprehensive set of features and tools to streamline the hosting experience. This article will guide you through the step-by-step process of installing EHCP on both Red Hat-based distributions (RHEL, CentOS, Fedora) and Debian-based distributions (Ubuntu, Debian, Linux Mint). Prerequisites Before we begin, make sure you have the following prerequisites in place − A server or virtual machine running one of the supported Linux distributions. Root access or sudo ...
Read MoreInstall Glances, InfluxDB and Grafana to Monitor CentOS 7
Monitoring the performance and health of your CentOS 7 server is essential for maintaining its stability and optimizing its resources. In this article, we will explore how to install and configure Glances, InfluxDB, and Grafana—a powerful trio of monitoring tools—to gather system metrics, store them in a time-series database, and visualize them in real-time dashboards. Monitoring Stack Architecture Glances Data Collection InfluxDB Data Storage Grafana Visualization ...
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