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private , virtual bytes

Posted on 2001-09-04
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hi
what's private bytes and virtual bytes?
what's the differences?
thanks
liat
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Question by:lnln
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17 Comments
 
LVL 32

Expert Comment

by:jhance
ID: 6452970
Can you explain the context in which you are asking this question?  You've asked this in the HARDWARE topic area and this doesn't seem to be relevant.
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LVL 23

Expert Comment

by:slink9
ID: 6453044
Homework question, perhaps?
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Author Comment

by:lnln
ID: 6453047
this concern the computer memory
(ram and rom memory)
which area should I refer this question?
liat
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Author Comment

by:lnln
ID: 6453059
thanks
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LVL 32

Expert Comment

by:jhance
ID: 6453072
Again, please explain what you are looking for.  I've not ever heard the terms "virtual byte" or "private byte" used in the context of computer memory hardware.

If you would please EXPLAIN in greater detail it would help to provide you with an answer.
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LVL 23

Expert Comment

by:slink9
ID: 6453087
Just by the term virtual (I have never heard either of these terms applied to bytes, but memory) then virtual memory would be the amount of swap file space.  The opposite of that would be "real" memory which would be the amount of installed memory.  For instance, you may have 128 megs of ram installed and should also have a minimum of 128 meg swap file.  When the installed memory fills up the computer uses the swap file and swaps sections from memory to hard disk and back into memory.
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LVL 23

Expert Comment

by:slink9
ID: 6453090
It's nice to know that I am not the only one who is "in the dark" in reference to this terminology.
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LVL 23

Expert Comment

by:slink9
ID: 6453103
Not reference to hardware, software - http://www.engr.orst.edu/~mock/mock_wp.htm
http://www.artefaktur.ch/doc/ref/class_acdk__lang__Byte.html
Again - homework assignment?  If so, I claim exclusive rights to the info provided and you should find it yourself.
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Author Comment

by:lnln
ID: 6453107
ok,
I'm working as qa engineer
when you want to test memory leak of the computer
you have to measure virtual and private bytes
before using application and after
(memory should be freed after using application)
I'm just asking what is exactly the difference between private
and virtual

thanks
liat
0
 
LVL 23

Expert Comment

by:slink9
ID: 6453147
Maybe those links will help you on the difference.  Since this appears to be a programming question (specifically C or java) you may get more useful help by posting a 0 point link to this question in one of those areas.
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LVL 4

Expert Comment

by:1175089
ID: 6453258
Every modern 32bit OS gives separate address space for the user app and usually some virtual "pages" in the swap area.After that OS must clear used RAM memory and swap pages and mark it "reusable".The process isn't so clear becouse there is a few ways to realize wirtual memory (segments, pages and mix from it)but this is another theme...
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LVL 7

Expert Comment

by:pbessman
ID: 6453641
    Only reference I find for either term is to Private bytes.
http://support.microsoft.com/support/kb/articles/Q224/3/45.ASP
     I have searched all over for Virtual bytes an as Slink9 suggested it appears to be the memory that would be tied up by some Java Application.  Nothing on the actual Term Virtual Byte.  Who is giving you these terms?  It appears as though they are not working with a full deck.  Can you verify that it is indeed VIRTUAL BYTE, no searches get anything on it.
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LVL 23

Expert Comment

by:slink9
ID: 6453694
If you do a search for
"virtual byte"
(notice the quotes) on www.google.com you will come up with a lot of hits.  That is where I got the two I posted.
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LVL 7

Expert Comment

by:pbessman
ID: 6453760
You may get a lot of hits but nothing seems to define what they are.  I did the same thing and only thing that makes sense is that someone is a bit confused in their terms or is trying to test their students.  Sometimes, no matching answer is correct answer. :-)
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Expert Comment

by:jlauster
ID: 6453894
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Accepted Solution

by:
xSinbad earned 150 total points
ID: 6455483
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Expert Comment

by:xSinbad
ID: 6455488
Not sure if this is 100% but here goes

private bytes - the actual amount of physical RAM memory used by a process

virtual bytes - the amount of paged RAM memory used by the process.
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