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Assignment No. 03
CS604 –Operating System
Total Marks: 20
Due Date: 28-07-2016
Rules for Marking:
It should be clear that your assignment will not get any credit if:
Prepare 4 to 5 slides and record your video about the following topic. Upload slides and video on VU-LMS after zipping it.
Topic: How Paging Saves External Fragmentation
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kuch smj nai a rha assignment ka question
Book mn ye likha hua
Paging itself is a form of dynamic relocation. When we use a paging scheme, we have
no external fragmentation; however we may have internal fragmentation.
plz koi vu walun se puch lo is assignment ka because is ki to kuch samaj nahi aa rahi
aoa plz assignment discus kre lodshding aur low power voltage ki wja si sara din computer on nahe hota .video ks ki bnani ha .resepresenter hmi hona ha vido me ye kesi ho skta ha.
boy to assignment bna len gi ,assignment me apna face dekha den gi aur send krde gi
lekn girls kesi kren gi .
aur topic ko kuch discus kre.
Ap nakab mn bna len video r PowerPoint ki just file and krni hy jo kuch us mn likhn gy uski presentation ap ny deni video mn
Paging is a matter of holding data in memory. Fragmentation is the result of writing data to storage, so the more the computer can rely on the paging file for writing new data the less fragmented the resulting file will be when written to disk.
A typical fragmentation problem occurs when a document is being revised. If the original document is 100K and is followed immediately on the disk by another file, any additions to the document will make it longer and that addition has to go someplace else as a fragment. If there are two documents open at the same time (like one for how to clean up the house and a second one for where to find the things that have been put away) and they are each being edited alternately, without paging there could be dozens of tiny fragments in each one as they were written. With paging each file gets written once instead of dozens of times..
When you pack the car for a vacation trip, you gather up all the various items according to when they will be used. All the beach things will go in first so they will come out last, suitcases will go on top. If you just threw the stuff in the trunk it would all be jumbled. The original piles of items are like paging and the mix (or not) of the items in the trunk is like fragmentation
2 files bnani hain ak powerpoint ki file ho gi r 2sri hm ny video record krni hai jis m hm apni powerpoint wali presentation ko explain karin gy
– Frequent loading and unloading programs causes free space to be broken
into little pieces
– External fragmentation exists when there is enough memory to fit a process
in memory, but the space is not contiguous
– 50-percent rule: Simulations show that for every 2N allocated blocks, N
blocks are lost due to fragmentation (i.e., 1/3 of memory space is wasted)
– We want an allocation policy that minimizes wasted space.
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