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.
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paging is the process of memory management in which memory is allocated in the non contiguous form,i.e. the program is break into block of fixed size known as page and also the main memory also break down into block of same size known as frame or page frame. Now all this page are brought into the main memory but in the space available so they can be contiguous if they find whole space required by the program or if the space is available but in scattered form then they can give space in non contiguous form. But in demand paging only those pages are brought into main memory which are required to execute the program at that time when a program need other pages it will swap out the unused pages from the main memory and swap in the desired page thus allowing it to execute the program though the space available is not sufficient to bring the whole program into main memory..................One of the problem arises due to demand paging is page fault which is caused due to required page not found in main memory for which we require swapping. hey if you like my post don't forget to thank me....... for any further queries e-mail me at hemant_spidey3@yahoo.co.in or 1989hemantrajput@gmail.com