Thursday, November 29, 2007

Assignment No.2


UNIX sysadmins claim that UNIX is intrinsically better designed.Stored in many text files,The kernel does not use shared libraries (Linux modules are not shared.UNIX systems for handling heavy-duty applications.


Windows NT is a portable, secure, multithreaded, multiprocessing operating system.Windows NT is a portable, secure, multithreaded, multiprocessing operating system. As a result, its virtual memory manager must:• Be compatible with multiple processor types • Protect the NT Executive from applications • Protect applications from each other • Provide mechanisms for programs to efficiently share physical memory (RAM). • Be efficientAn Application's View of MemoryIn Windows NT, applications access memory using a 32-bit linear addressing scheme. This scheme is sometimes referred to as flat memory model because applications view memory as one linear (or flat) array of memory locations. Applications address memory using simple 32-bit offsets from address zero (0). Since a 32-bit offset can specify 232 memory addresses, each application can access up to 4 Gb of (virtual) memory.

Tuesday, November 20, 2007

Assignment No.1

1.Operating Systems

An operating system (OS) is the software that manages the sharing of the resources of a computer and provides programmers with an interface used to access those resources. An operating system processes system data and user input, and responds by allocating and managing tasks and internal system resources as a service to users and programs of the system. At the foundation of all system software, an operating system performs basic tasks such as controlling and allocating memory, prioritizing system requests, controlling input and output devices, facilitating networking and managing file systems. Most operating systems come with an application that provides a user interface for managing the operating system, such as a command line interpreter or graphical user interface. The operating system forms a platform for other system software and for application software.
The most commonly-used contemporary desktop OS is Microsoft Windows, with Mac OS X also being well-known. Linux and the BSD are popular Unix-like systems.

2.Give at least two reason why a regional bank might decide to buy six server computer instead of one supercomputer.

  1. We need six server computer instead of one because to be faster in working.
  2. We need six server computer instead of one because its better to work faster.