types of multiprogramming and difference bet multiprocessing and multiprogramming?
the main difference b/w multiprogramming and multiprocessing O.S. is that the previous one is non-interactive O.S. and the later is interactive O.S. By-Satyam Maheshwari
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.
multiprocessor is hardware based while multiprogramming in software based
Time Sharing 01. Time Sharing is the logical extension of multiprogramming, in this time sharing Operating system many users/processes are allocated with computer resources in respective time slots. Multiprogramming 01. Multiprogramming operating system allows to execute multiple processes by monitoring their process states and switching in between processes. Time Sharing 02.Processors time is shared with multiple users that’s why it is called as time sharing operating system. Multiprogramming 02.Processor and memory underutilization problem is resolved and multiple programs runs on CPU that’s why it is called multiprogramming. Time Sharing 3. In time sharing OS system depends on time to switch between different processes. Multiprogramming 3. In Multiprogramming OS, system depends on devices to switch between tasks such I/O interrupts etc. Time Sharing 4. System model of time sharing system is multiple programs and multiple users. Multiprogramming 4. System model of multiprogramming system is multiple programs. Time Sharing 5. In this process, two or more users can use a processor in their terminal. Multiprogramming 5. In this, the process can be executed by a single processor. Time Sharing **6.**Time sharing OS has fixed time slice. Multiprogramming 7. Multi-programming OS has no fixed time slice. Time Sharing **8.**Time sharing system maximizes response time. Multiprogramming 8. Multiprogramming system maximizes response time. Time Sharing 9. Example: Windows NT. Multiprogramming 9. Example: Mac OS.
no of tasks can be done at a time is called multi tasking no of programmes can be executed in a single system is called multi programming
Multitasking is being able to do more than one thing at a time. Multiprogramming is using more than one 'language' to accomplish a task.
multiprogramming or multitasking means more than one program can execute at the same time. It is the allocation of a computer system and its resources to more than one application at the same time. However in uni-programming you can have only one program running at any point in time.
time sharing operating system is user interactive, but multiprogramming operating system need not be user interactive
processor must wait for I/O instruction to complete before preceding
timesharing is logical extention of multiprogramming.
It is the process of multiprogramming
THE multiprogramming system was created in 1968.
Multiprogramming System: In multiprogramming system the same memory is shared by different number of programmes. MultiUser system: More than one user can use the system at a time.There will one centralized server and the users connected with the system are called as dump terminals.
Don't tell me what to do.
MS-DOS supports multiprogramming to some extent.-
is it possible to do multiprogramming with only one partition
Multiprocessing means the computer can do multiple processes parallel of each other (at the same time) with no performance degradation. Multiprogramming is an application that can be used to interface with different programming languages (java, C++, etc)
multiprogramming-there is no way for single user to keep either cpu or the io divices busy at all times...
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 done by user but multiprogramming is done by operating system only.
The principal disadvantge of too much multiprogramming is the overhead of excesssive context-switching. If the context-switch rate is too high, the overhead can actually overwhelm the benefit of multiprogramming.
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 CPU and its I/O devices from various users. It attempts to increase CPU utilization by always having something for the CPU to execute. The prime reason for multiprogramming is to give the CPU something to do while waiting for I/O to complete. If there is no DMA, the CPU is fully occupied doing I/O, so there is nothing to be gained (at least in terms of CPU utilization) by multiprogramming.
Multiprogramming increases CPU utilization by organizing jobs so that the CPU always has a job to execute.