Working on machines without understanding them ? Then you should be here..
Geographical location should not become a barrier to Share our knowledge.
Puzzles and Interview question are intended to be discussed here.
If the number of frames allocated to a low-priority process falls below the minimum number required by the computer architecture, we must suspend that process' execution. We should then page out its remaining pages, freeing all its allocated frames. This provision introduces a swap-in, swap-out level of intermediate CPU scheduling.
src="http://pagead2.googlesyndication.com/pagead/show_ads.js" type="text/javascript">
In fact, look at any process that does not have "enough" frames. Although it is technically possible to reduce the number of allocated frames to the minimum, there is some (larger) number of pages in active use. If the process does not have this number of frames, it will quickly page fault. At this point, it must replace some page. However, since all its pages are in active use, it must replace a page that will be needed again right away. Consequently, it quickly faults again, and again, and again. The process continues to fault, replacing pages for which it then faults and brings back in right away.
This high paging activity is called thrashing. A process is thrashing if it is spending more time paging than executing.
src="http://pagead2.googlesyndication.com/pagead/show_ads.js" type="text/javascript">
In fact, look at any process that does not have "enough" frames. Although it is technically possible to reduce the number of allocated frames to the minimum, there is some (larger) number of pages in active use. If the process does not have this number of frames, it will quickly page fault. At this point, it must replace some page. However, since all its pages are in active use, it must replace a page that will be needed again right away. Consequently, it quickly faults again, and again, and again. The process continues to fault, replacing pages for which it then faults and brings back in right away.
This high paging activity is called thrashing. A process is thrashing if it is spending more time paging than executing.
0 comments:
Post a Comment