What is multiprogramming?
multiprogramming lets you do more than one thing at a time
multiprogramming is also called multi-threading here more than one operation in a program takes place..
Advantages of multiprogramming operating system: i) It increases CPU utilization. ii) It decreases total read time needed to execute a job. iii) It maximizes the total job throughput of a computer. Disadvantages of multiprogramming operating system: i) It is fairly sophisticated and more complex ii) A multiprogramming operating system must keep track of all kinds of jobs it is concurrently running.
Mutiprogramming helps increase the CPU utilization to some extent, but if the degree of Multiprogramming is increased above a certain limit (i.e Heavy Multiprogramming) it can lead to Thrashing and thus decrease the CPU utilization drastically. Heavy Multiprogramming may lead to Thrashing, a condition where a system is spending more time Page Faulting (i.e swapping pages in and out of memory) rather than executing them, this leads to deterioration of system performance.
Multiprogramming is collecting several jobs in a job pool and the OS selects the job from the pool so that the CPU has one job to execute , in case of any IO request for the job in execution the CPU switches to another job here switching is less compared to multitasking.So a computer system which allows such type of switching in between jobs is called a multiprogramming system. Please make note that multitasking is…
Multiprogramming is the rapid switching of the CPU between multiple processes in memory. It is done only when the currently running process requests I/O, or terminates. It was commonly used to keep the CPU busy while one or more processes are doing I/O. It is now mostly superceded by multitasking, in which processes also lose the CPU when their time quantum expires. Multiprogramming makes efficient use of the CPU by overlapping the demands for the…
Passive multiprogramming is characterized by event generated interrupts that cause task switching. These events are usually the result of a program-initiated action, such as sending a record to an output device, or dividing by zero. Active multiprogramming is characterized by time generated interrupts that cause task switching. The time interrupt is generated by a system clock monitored by the operating system.
'What is the difference between multiprogramming and multitasking and what is meaning of a task if we consider a task as a program then the concept will be multiprogramming then what is the differenc?
First of all there is difference between program and a task. There may be multiple tasks running related to one program at the same time. so if the processor is busy in multiple tasks related to one program then it is multitasking. But if the multiple tasks which the processor is executing concurrently are related to different independent programs then the concept is know as multiprogramming.
Multiprogramming is a feature of an OS which allows running multiple programs simultaneously on 1 CPU. So, say, you may be typing in word, listening to music while in background IE is downloading some file & anti-virus program is scanning. These all happen simultaneously to you. Actually programs don't run simultaneously, but OS divides time for each program according to priorities. When the chance of that program comes it runs, after the stipulated time is…