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    Ya, that makes sense. So with 1 row of 8...

    Ya, that makes sense. So with 1 row of 8 parallel chips per DIMM, 29 bits would be used to access locations, 0 for chips, and 3 bits for dimm slots. The only thing that confuses me is if for...
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    I think i'll take the other approach, extend the...

    I think i'll take the other approach, extend the address to 34 bits. So when looking at the locations per chip, 8 chips in parallel, and 8 dimm slots total. This 34 bit address needs to be able to...
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    right, because 2^32 = 4 GB (which is why i was...

    right, because 2^32 = 4 GB (which is why i was racking my brain). For all 16GB you'd need a 34 bit address than right? So assuming a 4GB system, than i'd reduce the number of DIMM Slots to 2, than...
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    Thank you, the way you put it made a lot of...

    Thank you, the way you put it made a lot of sense. Since each row represents 4 bytes you'd need a rectangle of 4 (across) by 2^29 (down) to make 2GB. I think the only reason I was struggling was...
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    I don't have an "assignment", prof, or class. ...

    I don't have an "assignment", prof, or class. I'm working out of a text book trying to grasp hardware issues, especially memory. Which is probably why i'm not doing so well.

    I could scan you the...
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    Memory Questions

    Sorry to re-post, but the last thread didn't really help much. Mainly because things weren't explained to me and my goal is to understand. At this point I am looking for the answers, but also...
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    But it looks like you were estimating transfer...

    But it looks like you were estimating transfer rate strictly from main memory, should i estimate the data transfer rate from main memory, and all levels of cache? Than maybe average them out?


    ...
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    You kind of lost me there. The only data I have...

    You kind of lost me there. The only data I have available is the table I gave in my first post. I don't know the width of the bus. With what I have, I must calculate:

    a)average effective access...
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    Sorry for not phrasing properly. My questions...

    Sorry for not phrasing properly. My questions are as follows:

    1) Is my formula for "average effective access time for memory references" correct? meaning, will it give me a rough estimate?
    ...
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    oh ok, so since the number of rows are 4, 4 rows...

    oh ok, so since the number of rows are 4, 4 rows of 8 chips....that means the total number of chips per DIMM slot is 32?
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    Cache and Main Memory

    If there is a 3-level cache structure in place with the following characteristics:



    organized as column 1) Level, column 2) access time (nano-secs), column 3) Hit %

    L1 2nsec...
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    hold on a sec, you mean 32 rows, isn't 2GB =>...

    hold on a sec, you mean 32 rows, isn't 2GB => 2^34 bits. Than 2^34 / 2^29 = 32, so it's 32 rows of 8 chips.....Than is that the total amount of chips I need, 32 * 8...or what's the next step?
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    I'm kind of lost at this point....further...

    I'm kind of lost at this point....further re-reads of the text book hasn't helped and i'm not sure what your trying to indicate to me at this point. Sorry...
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    2^31 / 2^29 = 4? so I need 4 chips per DIMM...

    2^31 / 2^29 = 4?

    so I need 4 chips per DIMM slot?
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    I'm a bit confused, 2 GB = 2, 147, 483, 648...

    I'm a bit confused,

    2 GB = 2, 147, 483, 648 bytes

    2, 147, 483, 648 bytes / 8 DIMM Slots = 268, 435, 456 bytes/Dimm slot

    268, 435, 456 bytes / 2^29 locations = 0.5 bytes/location

    0.5...
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    Designing a memory system

    I am new to the hardware realm and am having difficulty with some work i've been assigned from a text book. Any help would be greatly appreciated.

    Question:...
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    Using a table to store PCB information?

    I've been reading up on operating systems and trying to understand the flury of information i'm digesting. This question pertains to storing PCB's. What are the benefits and limitations of storing...
  18. Thread: Memory question

    by John_L
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    That's good to know, thanks a lot. So ppl...

    That's good to know, thanks a lot. So ppl mentioned it not really even working with hard drives. I guess that's always been kind of an "computer myth" when it comes to destroying data. So you'd...
  19. Thread: Memory question

    by John_L
    Replies
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    Memory question

    This may be a bit of a strange question but here it goes. My girlfriend called me saying her nephew was playing around with my computer parts we have at home. He used magnets on my computer memory...
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    I'm not sure how to apply that to what i'm trying...

    I'm not sure how to apply that to what i'm trying to do. I'm trying to allow make the command "ls *.c" display all the C files in the current directory. Looking at your code doesn't really help me...
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    How to properly use a C function?

    Below I posted a small piece of my code. I'm not familiar with using this C function that's highlighted in red and my program generates the following when executed:

    "10 [main] a.out 4488...
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    It's fine now. It's really not much extra effort...

    It's fine now. It's really not much extra effort creating a new array of set size to hold the actual amount of arguments there are. Everything executes fine and the commands work properly now with...
  23. Thread: regex

    by John_L
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    All I could really dig up was the following. For...

    All I could really dig up was the following. For handling let's say the command "ls -l *.c". But I have no idea what "globbuf" is. Any of you guys ever tried doing something like this before. I...
  24. Thread: regex

    by John_L
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    I've been trolling the net for something like the...

    I've been trolling the net for something like the glob library. Haven't come across anything though. Any links to it? No idea how to implement any of the functions otherwise.
  25. Thread: regex

    by John_L
    Replies
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    1,849

    regex

    I wrote a primitive shell program that reads in commands from standard input. What's the best way to handle "globbing", i.e. "ls *.c" (list all files with ".c" extension). I'm sure I don't have to...
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