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Operating System Articles
Page 63 of 171
User View vs System View in Operating System
An operating system is a construct that allows user application programs to interact with the system hardware. Operating system by itself does not provide any function but it provides an atmosphere in which different applications and programs can do useful work. The operating system can be observed from two distinct perspectives − the user view and the system view. Each perspective focuses on different aspects and priorities of the operating system's functionality. Operating System Perspectives User View Focus: Ease of Use ...
Read MoreSymmetric Multiprocessing
Symmetric Multiprocessing (SMP) is a multiprocessor architecture where multiple processors share a common memory and operating system. All processors work together as equals to execute processes, with the operating system treating each processor identically and no processor reserved for special purposes. Most computer systems are single processor systems, but multiprocessor systems are increasing in importance nowadays. These systems have multiple processors working in parallel that share the computer clock, memory, bus, and peripheral devices. Types of Multiprocessor Systems There are mainly two types of multiprocessor systems − Symmetric Multiprocessor System − All processors are treated ...
Read MoreAsymmetric Multiprocessing
Asymmetric multiprocessing (AMP) is a type of multiprocessor system where processors are assigned specific roles and are not treated equally. Unlike symmetric multiprocessing, where all processors can perform any task, asymmetric systems have a hierarchical structure with specialized processor functions. How Asymmetric Multiprocessing Works In asymmetric multiprocessing, processors have distinct roles and responsibilities. Typically, one processor acts as the master and controls the system, while other processors serve as slaves that handle specific tasks assigned by the master. Asymmetric Multiprocessing System Master ...
Read MoreWhat is caching?
Cache is a small, high-speed memory that stores frequently accessed data to reduce the time needed to retrieve information from slower storage devices. The process of storing and accessing data from a cache is known as caching. Cache memory acts as an intermediary between the CPU and main memory, significantly improving system performance. How Caching Works When the CPU needs data, it first checks the cache. If the data is found (called a cache hit), it's retrieved quickly. If not found (called a cache miss), the system fetches the data from main memory and stores a copy in ...
Read MoreHot Standby Mode
The hot standby mode is a fail-safe mechanism in which a hot standby component is part of an active system. If any component of the system fails, the hot standby component immediately takes its place. In general, a hot standby can refer to any device, system, or component that overtakes operation from a failed device and reduces the startup delay that would otherwise be significant. Hot Standby Mode Operation Active System Processing Requests ...
Read MoreStorage Area Networks
Storage Area Networks (SANs) are specialized high-speed networks that provide block-level access to consolidated storage devices. Unlike traditional file-based storage access, SANs make storage devices appear as locally attached drives to servers, enabling multiple systems to share storage resources efficiently. SANs are widely adopted across organizations of all sizes due to their cost-effectiveness and scalability. They separate storage resources from individual servers, creating a dedicated storage infrastructure that can be managed centrally. Storage Area Network Architecture Host Layer Server 1 ...
Read MoreBeowulf Clusters
Beowulf clusters are high-performance computing systems built from commodity hardware − normal, identical computers connected through a local area network (LAN). These clusters use specialized software to distribute processing tasks across multiple nodes, creating a cost-effective parallel processing unit from standard personal computers. The concept originated in 1994 when Thomas Sterling and Donald Becker built the first Beowulf cluster at NASA. The name "Beowulf" was borrowed from the famous Old English epic poem, and has since become synonymous with clusters built from commodity hardware running open-source software. Beowulf Cluster Architecture ...
Read MoreUser Mode vs Kernel Mode
User mode and kernel mode are two distinct operating modes that ensure system security and stability. The CPU switches between these modes to control access to system resources and prevent unauthorized operations that could crash the system or compromise security. User Mode In user mode, applications run with restricted privileges and cannot directly access hardware or critical system resources. When a user program needs system services (like file I/O or memory allocation), it must request help from the operating system through system calls. The mode bit is set to 1 in user mode. Key characteristics include: ...
Read MoreSupervisor Mode (Privileged Mode)
Supervisor mode (also called privileged mode or kernel mode) is a computer system execution mode in which the processor can execute all instructions, including privileged instructions. These special instructions include interrupt management, I/O operations, memory management, and system configuration commands that are restricted from normal user programs. The privilege levels of different components in a system form a hierarchical structure − System Privilege Levels Kernel Mode (Ring 0) Highest Privilege Device Drivers (Ring 1-2) Limited Privilege ...
Read MoreReal-Time Embedded Systems
Real-time embedded systems are specialized computing systems that combine the strict timing requirements of real-time systems with the dedicated functionality of embedded systems. These systems must respond to external events within specific time constraints while performing dedicated tasks within larger systems. A real-time system operates under strict time constraints and provides worst-case time estimates for critical operations. An embedded system provides specific functionality within a larger system. When these two concepts merge, we get a real-time embedded system that must meet both timing deadlines and perform specialized tasks reliably. Types of Real-Time Embedded Systems Real-time embedded systems ...
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