Re: )))))))Vu & Company((((((( help required regarding operating system's assignment....

chalo ji theek hai tussan ghar pohanch ke reply kr dewaaey.........

On Fri, Jul 1, 2011 at 1:54 AM, Mohammad Sajjad <ghulamemastan@gmail.com> wrote:

bus main adhay ghantay wich ghr pohnchanr ala akhri train hai aj 3
traina tabdeel karni pay gaeyan hen hin paron

On 6/30/11, mc090202888 Saba Naureen <mc090202888@vu.edu.pk> wrote:
> am still waiting....... Sajjad para....
>
> On Fri, Jul 1, 2011 at 12:59 AM, Mohammad Sajjad
> <ghulamemastan@gmail.com>wrote:
>
>> sis goto insert and select chart
>>
>> On 6/30/11, mc080404722 Maria Shahzadi <mc080404722@vu.edu.pk> wrote:
>> > hi
>> > who is there plz tell me that how to make a chart in ms-word i forgot..
>> plz
>> > tell me early..
>> >
>> > On Fri, Jul 1, 2011 at 12:22 AM, Mohammad Sajjad
>> > <ghulamemastan@gmail.com>wrote:
>> >
>> >> dekha mera nam hi kafi hai ab samajh i k samjhaon?
>> >>
>> >> On 6/30/11, mc090202888 Saba Naureen <mc090202888@vu.edu.pk> wrote:
>> >> > hmmmmmmmmm samajh aa gai pehle sawal ki.......
>> >> > how intelligent i am .........
>> >> >
>> >> > On Thu, Jun 30, 2011 at 11:39 PM, mc090202888 Saba Naureen <
>> >> > mc090202888@vu.edu.pk> wrote:
>> >> >
>> >> >> A computer system has a 36-bit virtual address space with a page
>> >> >> size
>> >> >> of
>> >> >> 8K, and 4 bytes per page table entry.
>> >> >>
>> >> >>    1. How many pages are in the virtual address space?
>> >> >>    2. What is the maximum size of addressable physical memory in
>> >> >> this
>> >> >>    system?
>> >> >>    3. If the average process size is 8GB, would you use a one-level,
>> >> >>    two-level, or three-level page table? Why?
>> >> >>    4. Compute the average size of a page table in question 3 above.
>> >> >>
>> >> >> Solution:
>> >> >>
>> >> >>    1. A 36 bit address can address 2^36 bytes in a byte addressable
>> >> >>    machine. Since the size of a page 8K bytes (2^13), the number of
>> >> >> addressable
>> >> >>    pages is 2^36 / >2^13 = 2^23
>> >> >>    2. With 4 byte entries in the page table we can reference 2^32
>> >> >> pages.
>> >> >>    Since each page is 2^13 B long, the maximum addressable physical
>> >> memory
>> >> >> size
>> >> >>    is 2^32 * 2^13 = 2^45 B (assuming no protection bits are used).
>> >> >>    3. 8 GB = 2^33 B
>> >> >>
>> >> >> We need to analyze memory and time requirements of paging schemes in
>> >> order
>> >> >> to make a decision. Average process size is considered in the
>> >> calculations
>> >> >> below.
>> >> >>
>> >> >> *1 Level Paging*
>> >> >> Since we have 2^23 pages in each virtual address space, and we use 4
>> >> bytes
>> >> >> per page table entry, the size of the page table will be 2^23 * 2^2
>> >> >> =
>> >> >> 2^25.
>> >> >> This is 1/256 of the process' own memory space, so it is quite
>> costly.
>> >> (32
>> >> >> MB)
>> >> >>
>> >> >> *2 Level Paging*
>> >> >> The address would be divided up as 12 | 11 | 13 since we want page
>> >> >> table
>> >> >> pages to fit into one page and we also want to divide the bits
>> roughly
>> >> >> equally.
>> >> >>
>> >> >> Since the process' size is 8GB = 2^33 B, I assume what this means is
>> >> that
>> >> >> the total size of all the distinct pages that the process accesses
>> >> >> is
>> >> 2^33
>> >> >> B. Hence, this process accesses 2^33 / 2^13 = 2^20 pages. The bottom
>> >> level
>> >> >> of the page table then holds 2^20 references. We know the size of
>> each
>> >> >> bottom level chunk of the page table is 2^11 entries. So we need
>> >> >> 2^20
>> /
>> >> >> 2^11
>> >> >> = 2^9 of those bottom level chunks.
>> >> >>
>> >> >> The total size of the page table is then:
>> >> >>
>> >> >> //size of the outer page table
>> >> >>
>> >> >>    //total size of the inner pages
>> >> >>
>> >> >>   1 * 2^12 * 4
>> >> >>
>> >> >> +    2^9 * 2^11 * 4
>> >> >>
>> >> >> =    2^20 * ( 2^-6 + 4) ~4MB
>> >> >>
>> >> >> *3 Level Paging*
>> >> >> For 3 level paging we can divide up the address as follows:
>> >> >> 8 | 8 | 7 | 13
>> >> >>
>> >> >> Again using the same reasoning as above we need 2^20/2^7 = 2^13
>> >> >> level
>> 3
>> >> >> page table chunks. Each level 2 page table chunk references 2^8
>> >> >> level
>> 3
>> >> >> page
>> >> >> table chunks. So we need 2^13/2^8 = 2^5 level-2 tables. And, of
>> course,
>> >> >> one
>> >> >> level-1 table.
>> >> >>
>> >> >> The total size of the page table is then:
>> >> >>
>> >> >> //size of the outer page table
>> >> >>
>> >> >> //total size of the level 2 tables
>> >> >>
>> >> >> //total size of innermost tables
>> >> >>
>> >> >>   1 * 2^8 * 4
>> >> >>
>> >> >> 2^5 * 2^8 *4
>> >> >>
>> >> >> 2^13 * 2^7 * 4
>> >> >>
>> >> >> ~4MB
>> >> >>
>> >> >> As easily seen, 2-level and 3-level paging require much less space
>> then
>> >> >> level 1 paging scheme. And since our address space is not large
>> enough,
>> >> >> 3-level paging does not perform any better than 2 level paging. Due
>> to
>> >> the
>> >> >> cost of memory accesses, choosing a 2 level paging scheme for this
>> >> process
>> >> >> is much more logical.
>> >> >>
>> >> >>    1. Calculations are done in answer no. 3
>> >> >>
>> >> >>
>> >> >>
>> >> >>
>> >> >> On Thu, Jun 30, 2011 at 11:37 PM, mc090202888 Saba Naureen <
>> >> >> mc090202888@vu.edu.pk> wrote:
>> >> >>
>> >> >>> A computer system has a 32-bit virtual address space with a page
>> size
>> >> of
>> >> >>> 4K and 8
>> >> >>> bytes per page table entry.
>> >> >>> 1. How many pages can be in the virtual address space?
>> >> >>> 2. What is the maximum size of addressable physical memory in this
>> >> >>> system?
>> >> >>>
>> >> >>> is question ki exact ulat example mili hai..... net se
>> >> >>>
>> >> >>>
>> >> >>> On Thu, Jun 30, 2011 at 11:33 PM, Mohammad Sajjad <
>> >> >>> ghulamemastan@gmail.com> wrote:
>> >> >>>
>> >> >>>> knsa hai swal ji?
>> >> >>>>
>> >> >>>> On 6/30/11, mc090202888 Saba Naureen <mc090202888@vu.edu.pk>
>> wrote:
>> >> >>>> > bhaiya assignment ke sawal hi nahi hal ho rahe..... kiya
>> >> >>>> > karan......
>> >> >>>> >
>> >> >>>> > On Thu, Jun 30, 2011 at 11:28 PM, Mohammad Sajjad
>> >> >>>> > <ghulamemastan@gmail.com>wrote:
>> >> >>>> >
>> >> >>>> >> yes what help u need?
>> >> >>>> >>
>> >> >>>> >> On 6/30/11, mc090202888 Saba Naureen <mc090202888@vu.edu.pk>
>> >> wrote:
>> >> >>>> >> > yar kisi ne is stupid assignment ko try kiya hai????
>> >> >>>> >> >
>> >> >>>> >> > --
>> >> >>>> >> > You received this message because you are subscribed to the
>> >> Google
>> >> >>>> >> > Groups
>> >> >>>> >> > "Vu and Company" group.
>> >> >>>> >> > To post to this group, send email to
>> >> >>>> vu-and-company@googlegroups.com.
>> >> >>>> >> > To unsubscribe from this group, send email to
>> >> >>>> >> > vu-and-company+unsubscribe@googlegroups.com.
>> >> >>>> >> > For more options, visit this group at
>> >> >>>> >> > http://groups.google.com/group/vu-and-company?hl=en.
>> >> >>>> >> >
>> >> >>>> >> >
>> >> >>>> >>
>> >> >>>> >>
>> >> >>>> >> --
>> >> >>>> >> ~Ghulam-e-Mastan~
>> >> >>>> >>   الله محمد چار یار حاجی خواجہ قطب فرید
>> >> >>>> >> ( حق فرید یا فرید ( رحمتہ الله علیہ
>> >> >>>> >>
>> >> >>>> >> --
>> >> >>>> >> You received this message because you are subscribed to the
>> Google
>> >> >>>> Groups
>> >> >>>> >> "Vu and Company" group.
>> >> >>>> >> To post to this group, send email to
>> >> vu-and-company@googlegroups.com.
>> >> >>>> >> To unsubscribe from this group, send email to
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>> >> >>>> >> For more options, visit this group at
>> >> >>>> >> http://groups.google.com/group/vu-and-company?hl=en.
>> >> >>>> >>
>> >> >>>> >>
>> >> >>>> >
>> >> >>>> > --
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>> >> >>>> Groups
>> >> >>>> > "Vu and Company" group.
>> >> >>>> > To post to this group, send email to
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>> >> >>>> > To unsubscribe from this group, send email to
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>> >> >>>> > For more options, visit this group at
>> >> >>>> > http://groups.google.com/group/vu-and-company?hl=en.
>> >> >>>> >
>> >> >>>> >
>> >> >>>>
>> >> >>>>
>> >> >>>> --
>> >> >>>> ~Ghulam-e-Mastan~
>> >> >>>>   الله محمد چار یار حاجی خواجہ قطب فرید
>> >> >>>> ( حق فرید یا فرید ( رحمتہ الله علیہ
>> >> >>>>
>> >> >>>> --
>> >> >>>> You received this message because you are subscribed to the Google
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>> >> >>>> To post to this group, send email to
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>> >> >>>> To unsubscribe from this group, send email to
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>> >> >>>> For more options, visit this group at
>> >> >>>> http://groups.google.com/group/vu-and-company?hl=en.
>> >> >>>>
>> >> >>>>
>> >> >>>
>> >> >>
>> >> >
>> >> > --
>> >> > You received this message because you are subscribed to the Google
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>> >> > To post to this group, send email to vu-and-company@googlegroups.com.
>> >> > To unsubscribe from this group, send email to
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>> >> > For more options, visit this group at
>> >> > http://groups.google.com/group/vu-and-company?hl=en.
>> >> >
>> >> >
>> >>
>> >>
>> >> --
>> >> ~Ghulam-e-Mastan~
>> >>   الله محمد چار یار حاجی خواجہ قطب فرید
>> >> ( حق فرید یا فرید ( رحمتہ الله علیہ
>> >>
>> >> --
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>> >>
>> >>
>> >
>> > --
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>> > To post to this group, send email to vu-and-company@googlegroups.com.
>> > To unsubscribe from this group, send email to
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>> >
>> >
>>
>>
>> --
>> ~Ghulam-e-Mastan~
>>   الله محمد چار یار حاجی خواجہ قطب فرید
>> ( حق فرید یا فرید ( رحمتہ الله علیہ
>>
>> --
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>>
>>
>
> --
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>
>


--
~Ghulam-e-Mastan~
  الله محمد چار یار حاجی خواجہ قطب فرید
( حق فرید یا فرید ( رحمتہ الله علیہ

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