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Slightly less than the number of processor in the system.
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.
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.
Concurrent processes require access to shared resources, synchronization mechanisms to coordinate access to those resources, and a way to manage communication and data exchange between processes. The operating system must provide support for process management, scheduling, and inter-process communication to enable concurrency. Additionally, proper error handling and robust design are essential for successful execution of concurrent processes.
multiprogramming
processor speed does not matter.
THE multiprogramming system was created in 1968.
A hard real-time system guarantees that critical tasks complete on time. This goal requires that all delays in the system be bounded from the retrieval of the stored data to the time that it takes the operating system to finish any request made of it. A soft real time system where a critical real-time task gets priority over other tasks and retains that priority until it completes. As in hard real time systems kernel delays need to be bounded
timesharing is logical extention of multiprogramming.
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 complexii) A multiprogramming operating system must keep track of all kinds of jobs it is concurrently running.
is it possible to do multiprogramming with only one partition
depends on quad processor type: For example Quad Processor Q8400 VID Voltage Range: 0.8500V-1.3625V