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Can anybody tell me what virtual memory implementation actually means? what is the difference between overlays and swapping? what is segmentation and paging?
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There is a decent explanation available here[^] in the form of a PowerPoint presentation. You'll need PowerPoint or the free viewer from Microsoft to view it.
"If it's Snowbird season, why can't we shoot them?" - Overheard in a bar in Bullhead City
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Virtual Memory is basically that the operating system presents the application with a flat address space, any of which can be accessed at any time and any amount can be used, regardless of how much physical memory is present. If the demand for physical memory gets too great, the system discards data not used recently, writing it to disk if necessary. If that data is then accessed, the system automatically reloads it somewhere in physical memory, then updates the virtual memory map to point to that physical memory.
Overlays are sections of program that can be loaded in, under program control, while the program is running, replacing other parts of the program. Many DOS apps made use of overlays to cram programs bigger than available memory (I recall Microsoft Works used overlays). Swapping is where the operating system shuffles pieces of program around in memory, loading from disk and discarding as necessary, without notifying the program that this is happening.
Segmentation and paging are two different sorts of swapping. Segmentation works on programmer-declared variable-size portions of a program called segments. Paging works on fixed size portions of programs or data called pages. The difference is that it's easier for the OS to locate blocks of memory if they're all the same size, making paging more predictable, but at the cost of the program incurring multiple swap operations to bring in a given piece of functionality (each different page hit causes the processor to raise a page fault exception, which causes the OS to locate that data, whereas if segmentation is used, the whole segment could be brought in).
Stability. What an interesting concept. -- Chris Maunder
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i hav linux,winxp and win98 installed on my pc .. i few days bak i formated my winxp drive and reinstalled it.. but now the problem is tat i have lost the grub.. now i am directly given the option to load xp or 98 but the linux grub is not being shown at load time
can any body help me
regards
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Use your Linux boot floppy or rescue CD to start Linux and re-install grub with the grub-install command.
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I am trying to install the bluetooth device driver from a third party vendor to the WinXP service pack 2. I encounter a conflict of bluetooth device driver from the Microsoft Bluetooth emulator. Has anyone enountered this problem? Can help?
Han
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Can you post an error message on this board? It is easy for us to search for the problem.
A thousand mile of journey, begin with the first step.
APO-CEDC
Save Children Norway-Cambodia Office
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i solve the problem. first with the bluetooth dongle plugged in i remove the device and the emulator from the device manager. Then I rename the inf file. Reboot and reinstall the third party software. And it works. Thanks pal 
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Hi, I found that morphix linux boot CDROM[^] could run without install any file on the hard disk drive. But I want to know are there any version of windows could run directly from the CDROM without install it on the hard drive too?
A thousand mile of journey, begin with the first step.
APO-CEDC
Save Children Norway-Cambodia Office
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Thank you very much Michael, On the other hand, I found a product on the market call Windows Preinstallation Environment (Windows PE). Is it work the same thing like the above hyperlink that you give to me or not???
A thousand mile of journey, begin with the first step.
APO-CEDC
Save Children Norway-Cambodia Office
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See the "What is the difference between BartPE and Microsofts WinPE?" section on the BartPE page.
--
I'm Michael Dunn and I approve this post.
Vote Trogdor in oh-four!
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Hi, can any one give me a short explaination about Windows Pre-installation Environment? I want to know what is it? and why we should use it?
A thousand mile of journey, begin with the first step.
APO-CEDC
Save Children Norway-Cambodia Office
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How do you write a boot-time utility for Windows 2k / XP?
By this I mean tools like chkdisk, partition magic and some defragmentation tools – that appear in a console-style window before the logon screen, allowing them to move around system files and do things without the system having many locks on files.
I’ve hunted around a bit and can’t find any guides, set of apis or anything open-source that would help. It would make great fodder for an article if anyone could see there way to writing one.
Specifically I think it would be quite an interesting exercise (!) to be able to write a defragmenter that runs at this time.
Really I would like to know how to write this kind of utility because I believe it would be a useful thing to know really!
/**********************************
Paul Evans, Dorset, UK.
**********************************/
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You must use the native api. Look for some explenation on sysinternals[^]
Wout Louwers
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That seems to be a post-logon-time defragger, rather then a while booting one. Nice link though.
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AH I see - didn't look hard enough. Sorry about that.
http://www.sysinternals.com/ntw2k/info/native.shtml
http://www.sysinternals.com/ntw2k/info/ntdll.shtml
Many thanks!
I rated your message 5.
/**********************************
Paul Evans, Dorset, UK.
**********************************/
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Thanks for the five Paul.
The two links in your post with this[^] one should answer the original post...
All three of them from sysinternals.
Wout Louwers
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hi every 1,
i am trying to inistall IIS on my operating system ( XP Home Edition ) using the add/remove programs then add windows components but the IIS does not show in the list , and i need to run ASP.Net and i can'nt
please help me
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Sakkijha wrote:
inistall IIS on my operating system ( XP Home Edition )
Sorry man, IIS is distributed with winxp pro not winxp home edition.
A thousand mile of journey, begin with the first step.
APO-CEDC
Save Children Norway-Cambodia Office
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You need XP Pro to have IIS - that and other networking things are the differences between Pro and Home editions.
You can try a freebie alternative called "XSP". It's an off-shoot of the "mono" project.
http://www.mono-project.com/about/index.html
/**********************************
Paul Evans, Dorset, UK.
**********************************/
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hi again, thanx 4 ur help
If I download this XSP can i create an ASP.Net project ?
please help
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Yes you can. Probably not suitable for production level high-volume stuff, but it should do.
http://www.mono-project.com/contributing/asp-net.html
/**********************************
Paul Evans, Dorset, UK.
**********************************/
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My son's old PC (AMD 800MHz with 512 RAM) which he used to play games and have music s/w on it is a bit messed up.
No sound and the floppy drive does not work, I have replaced it but still not working.
The PC also runs very slow and lots of disk access taking place.
Someone said format the hard drive and re-install windows - i.e. start again. I have run Norton Systems Works on the PC but makes no difference when things have been cleaned up.
My question is as the floppy drive is not working whats the best way to format the C: drive and re-install Windows?
Is this the right way tp proceed?
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