Ex04 - Querstion 3b)

Asfaloth
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Ex04 - Querstion 3b)

Beitrag von Asfaloth » 3. Dez 2015 15:22

Hi,

I'm currently reviewing the excersises. I think for question 3b some more information is needed, because you need the number of frames or the memory size.

If I understand correctly, you access the page table with the pid and a virtual address. The IPT maps this to a frame number and with the offset you access the memory. So without knowing how many frames or how much memory we have we cannot tell how many entries the page table has and how large it is.

Or do i understand the question wrong and we should only tell how it works without giving actual numbers?

Thanks!

Asfaloth
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Re: Ex04 - Querstion 3b)

Beitrag von Asfaloth » 3. Dez 2015 15:31

And should we make assumptions about the page table entry size? Because in this paper they choose 80bit and it seems to me it could vary: http://web.eecs.umich.edu/~akamil/teach ... 040104.pdf

nicolas
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Re: Ex04 - Querstion 3b)

Beitrag von nicolas » 4. Dez 2015 12:17

Task 3b is deliberately underspecified, you are supposed to give an explanation and an example. There is not just one correct solution. Pick realistic/plausible numbers for the information you are missing.

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