Thursday, March 26, 2009
Embark on The Golden Chariot, experience the luxurious journey and enjoy the lavish cuisine.
Check out the Korri Gassi Dharwadi Bhindi you will definitely love it.Lets check it out.T Now Times NowThe Luxurious Golden Chariot Part1.mp4This show is a feast for food fans. Because this is the first ever cookery show that is actually not a cookery show. Kunal Vijayakar, the incorrigible foodie, goes away from the cook-a-meal, do-a-restaurant-review format. He gets hold of celebrities, shops for food with them, bargains in the market and as if that were not exciting enough, he also makes them cook for him and then polishes off every morsel. The most appetizing hour for all food lovers.
More than 1 billion people on the planet don't have access to clean drinking water. For $20 a person, non-profit charity: water funds clean water solutions like shallow wells, deep wells, rainwater harvesting systems, and spring protections to provide people in need with clean and safe drinking water.
Find out how you can help give one person clean drinking water at http://www.charitywater.org/donate
charity: water's latest promo video features the well-drilling work we fund in the forgotten Central African Republic. Directed by Simon Willows, "Time Bomb" track donated by Beck.
Wednesday, March 25, 2009
Thirumalai Temple Darshan Timings
Monday, March 23, 2009
Tuesday, March 17, 2009
Friday, March 13, 2009
Thursday, March 12, 2009
Wednesday, March 4, 2009
Mainframe computer systems were the first computer used for many commercial and scientific applications. The operating system in mainframe computer used three concept.
1. Batch Systems
2. Multiprogramming Systems
3. Timeshared Systems
1. Batch Systems :
In batch systems, the user prepared a job which consisted of the program and the data. The job was usually stored in punch cards which was an input device for a mainframe systems. The output consisted of the result of the program.
The task of operating systems in mainframe computer was very simple. It loads the job [batched together job] into the main memory. When it finished, it loads the next job. Therefore, only one process was loaded into memory at a time.
Drawback of Mainframe Systems :
In batch system, to read the program, we need of a card reader. It was very slow in reading. The speed of the CPU was high when compared to speed the card reader. Therefore, most of the time, the CPU was idle.
Multiprogrammed Systems :
Multiprogramming systems overcomes the drawback of batch system. The basic idea of multiprogramming system is as follows :
The operating system keeps multiple jobs in main memory.
The operating system picks one of the jobs from the main memory and executes. If the running job needs of some input from the keyboard, it goes to waiting state. At that moment, some other job is picked up from main memory by operating system and that job is executed by CPU. Therefore, the CPU will never become idle.
Time-Sharing Systems : (CPU Scheduling + Multiprogramming)
Time sharing system is the extension of multiprogramming systems. In time sharing systems, the CPU switches so frequently from one job to another, so that each and every job gets the CPU time. Thus, the user can interact with each program while it is running.
A time-shared operating system allows many users to share the computer simultaneously. Since each action or command in a time-shared system tends to be short, only a little CPU time is needed for each user. As the system switches rapidly from one user to the next, each user is given the impression that the entire computer system is dedicated to the user, even though it is shared by many users.
In time-shared systems, several jobs must be kept simultaneously in main memory, so the operating system must have
1. Memory Management
Time-sharing is achieved through virtual memory techniques. The main advantage of the virtual memory scheme is that programs can be larger than physical memory.
1.1 Definition of OS
What is an Operating System?
An operating system is a program that manages the computer hardware. It acts as an intermediate between the user of the computer and the computer hardware.
According to their task completion, they are varied different kinds of Operating system are used for different computer systems. For example,
1. Mainframe Operating system are designed to optimize utilization of hardware.
2. Personal Computer (PC) operating system support complex games, business applications.
3. Handheld operating system used to interact with user easily.
Goal of Operating System :
1. It should be convenient to the user.
2. It should be efficient to the user.
Abstract view of the Components of a Computer System :
Sunday, March 1, 2009
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