0
votes
1answer
54 views

How can a computer run a program that's larger than RAM's limit?

For example, my RAM is 32 MB, but Windows 98's complete data uses over 200 MB. Assuming that the "whole OS" is loaded in to RAM, how could it all fit there is RAM is just 32 MB? Or am I looking at ...
0
votes
2answers
60 views

When upgrading from 32 bit OS to 64 bit OS in Windows XP, is it enough to format C: alone?

Currently am using windows XP 32 bit OS with 4 GB RAM. I want to upgrade to 8 GB RAM and I know it needs a 64 bit OS. I don't want to lose my data, though. So can I install a 64 bit OS by formatting ...
2
votes
2answers
129 views

Where are Page tables stored

My question is "where are the page tables stored: in physical memory (RAM) or as some data structure in User space". PS: What I have understood so far: A process memory layout has few segments ( ...
0
votes
2answers
87 views

In Tails, how long should it take to wipe 16gb system memory at shutdown?

I see this message - You can now remove the boot DVD or USB stick. The system memory is goin gto be wiped in a few seconds... Display might be corrupted during this operation. If the system ...
0
votes
0answers
18 views

Why was overlaying suppose to be done by the programmer?

I was reading about OS memory organization, and the first entry in the Virtual Memory(VM) chapter refers to overlaying and how when it was used at a large scale (up to the 60s) the process memory ...
0
votes
1answer
59 views

Why cant you install operating system onto RAM [duplicate]

Why cant you install an operating system onto RAM ?? I know RAM is temporary memory and this memory will be lost when the power is switched off so cant the computer like save the state of the ...
0
votes
0answers
116 views

How is the NVRAM/EPROM which contains the firmware placed and used

From this link - Chapter 9, section 9.1.4, it says: The first instruction that is fetched and executed following a hardware reset is located at physical address FFFFFFF0H. This address is 16 ...
3
votes
1answer
2k views

Who loads the BIOS in RAM during computer bootstrap

When the computer starts up, the code in BIOS is executed first. However, how is the code in BIOS loaded into the RAM for execution ? I have referred to this question - Is BIOS read from the BIOS ...
0
votes
2answers
123 views

Understand what is happening in Linux with ps, top, and free

I'm running my java program on a 12 cores 24 thread machine. They have several processes that are running simultaneously. It seems that I performed too many processes so that the whole tasks made the ...
0
votes
2answers
174 views

Steps of changing from 32-bit OS to 64-bit and changing RAM?

My laptop is Lenovo T400, whose CPU is 64-bit and RAM is 1x2GB. When I bought it, it already had 32-bit Windows 7. Then I partition the hard drive and install 32-bit Ubuntu 12.04 alongside Windows 7. ...
1
vote
2answers
217 views

Why not create an OS that runs in ram?

this might be the wrong StackExchange site to ask this question, but I couldn't find one better. There doesn't seem to be one for questions about Operating Systems. I've been thinking recently about ...
1
vote
2answers
79 views

Will applications running in root mode be able to overwrite OS's or other program's memory section?

I read here that any application running in root mode can issue a kernel call and execute in kernel mode. Is is possible that ANY application running in root mode can make a kernel call, go to kernel ...
1
vote
0answers
64 views

Huge file input/output

My question is a bit general, but the application is very practical. I wonder, how does system (Linux in particular, but general mechanisms are interesting too) handles reading/writing of huge (larger ...
0
votes
2answers
124 views

Can turning off a computer while an OS is running damage the RAM

The question pretty much says it all. I had a problem with RAM and bought new ones. Theoretically, what else could cause RAM problems that can be avoided?
0
votes
2answers
157 views

how do you determine the amount of RAM that will actually be used When referring to how a OS sees RAM [duplicate]

When choosing what RAM to install on a computer and what OS to run how do you determine the amount of RAM that will actually be used and not just recognized? for example here is my machine: How did ...
0
votes
1answer
92 views

Exhaustive Windows 7 troubleshooting procedure?

I have been using this laptop for almost two years now. Its an Intel 2nd Gen i3 with 4 GB of RAM with a 512 MB of ATI Radeon 5470 GPU running the 64-bit version of Windows 7 ultimate (Not too ...
18
votes
4answers
3k views

Why does Linux use a swap partition when the kernel supports paging/virtual memory anyway?

As far as I understand paging and swapping, they're completely different concepts. While swapping means, that a process is either completely in physical memory or on the hard drive, with paging parts ...
3
votes
2answers
1k views

How to improve ram and hard drive performance

I'm not able to figure out what the actual problem with my system is. It takes 15-20 min to start up completely and when I checked the start up programs there was no big program listed. When I open ...
1
vote
1answer
204 views

What is Root Buffer Overflow?

I understand what buffer overflow is. As the literature says, "A buffer overflow occurs when a fixed-length buffer reaches its capacity and a process attempts to store data above and beyond that ...
3
votes
3answers
4k views

Memory limits in 16, 32 and 64 bit systems

The theoretical memory limits in 16, 32 and 64 bit machines are as follows: 16 bit = 65, 536 bytes (64 Kilobytes) 32 bit = 4, 294, 967, 295 bytes (4 Gigabytes) 64 bit = 18, 446, 744, 073, 709, 551, ...
0
votes
2answers
521 views

Is there any disadvantage to running a 64 bit OS on a low memory system? [duplicate]

Possible Duplicate: advantage of 64 bit os on system with only 2Gb Is there any disadvantages in running a 64 bit OS on a low memory system, say 2GB of RAM or less? Would there be any ...
1
vote
2answers
206 views

Does the OS exploit multiple cores

I know that more cores isn't always better and that most applications are single threaded however does the OS make use of the additional cores? For example, assume an application such as a dictionary ...
0
votes
1answer
280 views

How to move between real mode and protected mode in Windows shell?

I notice an interesting thing happens when you give the old mem.exe command to an XP command prompt: The shell switches from Protected Mode to Real Mode as you can tell from the change in directory ...
36
votes
1answer
2k views

Do 64bit software/applications require more RAM than their 32bit counterparts?

I just saw these minimum requirements for a game: Memory: 2GB for 32-bit OS or 4GB for 64-bit OS Why does the 64bit OS require more RAM than its 32bit counterpart?
2
votes
1answer
150 views

Changing RAM from 2 GB up to 4 GB

I use Windows Vista 32 bit with 2 GB of RAM and now want to increase my RAM of 2 GB up to 4 GB. Does changing RAM of 2 GB up to 4 GB needs reinstalling windows vista 32 bit? And does 4 GB of RAM ...
1
vote
0answers
258 views

memory leak in windows 7 64-bit Enterprise Thinkpad T410 [closed]

My Windows 7 laptop of 1.5 years old seems to be leaking memory. After it boots and I log in and it reaches steady state, the memory consumed is usually about 1.5 GB. My laptop has 4 GB RAM. After ...
-1
votes
2answers
3k views

Upgrading RAM in Dell Optiplex 380 [closed]

I've Dell optiplex 380 machine and I've 32bit Windows 7 ultimate OS on it with DDR3 2*2GB RAM on it. I want to upgrade my machine to use 8GB RAM with 64bit windows 7 ultimate OS and want to install ...
6
votes
3answers
14k views

Is it the address bus size or the data bus size that determines “8-bit , 16-bit ,32-bit ,64-bit ” systems?

My simple understanding is as follows. Memory (RAM) is composed of bits, groups of 8 which form bytes, each of which can be addressed ,and hence byte addressable memory. Address Bus stores the ...
3
votes
6answers
8k views

Is it necessary to reinstall your OS after adding more RAM?

I know my question today is subjective but I feel it requires some debate to once and for all put this myth to bed. I've heard some myths and I'm not sure if it's true or false, but basically, the ...
1
vote
1answer
64 views

Memory upgrade scan tool not correct?

I have an older computer I've been fixing up to use as a small server and i'm in the process of upgrading the RAM. (It only has 1GB.) It's a Dell Dimension 9100. Uses PC2-5300 DDR2. It had windows ...
0
votes
2answers
1k views

Why is there RAM usage limitation in 32-bit Operating Systems? [duplicate]

Possible Duplicate: Why does Windows only show about 3.5GB of my 4GB+ of RAM? I stumbled through many blogs about the limitations of a 32-bit Windows in contrast to 64-bit. The foremost ...
1
vote
4answers
8k views

Can I add as much RAM as I like to my old computer?

I have had my computer for around 5-6 years. It's a Dell Vostro 200 Slim model. My OS is Vista Home Basic 32-bit. It has 1.00 GB RAM and my processor is an Intel(R) Core Duo @ 2.00 GHz. Can I ...
0
votes
2answers
635 views

How to make Windows 7 switch between programs faster after a while?

When I run Windows, I usually keep multiple programs open at all times. I have 4GB of memory installed (and capable of using all of it), and it hardly every uses more than 2.5 gigs. Yet, every time I ...
2
votes
2answers
120 views

Do applications get removed from RAM when they are closed?

I've noticed that when you open a program, close it, then open it again, it seems to open a lot quicker the second time around. Is this because the second time it's already in RAM? Put another way, ...
2
votes
3answers
1k views

Why does 32-bit Windows impose a 2 GB process address space limit, but 64-bit Windows impose a 4GB limit?

I get that 2^32 = 4,294,967,296 and 2GB is for the OS and 2GB is for the process, but why does a 64 bit OS only give 4GB of address space? Should it not be 2^64 = 18,446,744,073,709,551,615 which when ...
16
votes
4answers
1k views

Is killing a process still considered bad for memory management?

So I am having a little discussion with my boss about memory management. I've been told that killing a process does not allow it to deallocate memory. Is that still the case, or was that years ago? ...
1
vote
3answers
449 views

Do x86 applications use 64 bits addresses in x64 operative systems?

I was wondering... 64bits OSs can run 32bits applications right? Windows use WoW64 to achieve this right? My question is, when these applications are run, does they use 64bits or 32bits addresses? I ...
4
votes
4answers
3k views

Understanding “Flat memory model” and “Segmented memory model”

I am trying to understand Flat memory model and Segmented memory model. Are Flat memory model and Segmented memory model determined by CPU architecture or OS or both? Or are they not determined by ...
7
votes
2answers
2k views

Running Operating System from memory

Assuming SSD's are extremely prone to faliure how economical would it be to load an OS into main memory and run it from there? I can think I can deal with a few obvious drawbacks (I've survived ...
-1
votes
2answers
171 views

not getting whole of my computer's ram [duplicate]

Possible Duplicate: Why does Windows only show about 3.5GB of my 4GB+ of RAM? i have 8 GB of ram in my desktop but it shows "3.47gb is usable" how to get whole usage of the ram. please help ...
1
vote
2answers
2k views

Is there a reason to install a 64bit OS on a computer with less than 4GB of RAM? [duplicate]

Possible Duplicate: Is there any benefit from installing Windows 7 64-bit when you have less than 4GB or RAM? Hi everyone. I have a computer with Arch Linux x64 on it and 3 GB of RAM. ...
6
votes
2answers
11k views

2GB limit on 32bit operating systems

Does the 2GB limit on 32-bit operating systems mean that each process can only access 2GB of memory or that all processes together can only use 2GB of the physical memory in total? So, is the 2GB ...
0
votes
2answers
483 views

sizes of RAM, of virtual memory and of swap for 32-bit OS

If I understand correctly, a 32-bit OS (Ubuntu) can only address 4GiB memory, so RAM with size larger than 4Gib will only be used 4Gib of itself and the rest is a waste. I am now confused about this ...
2
votes
3answers
5k views

Computer does not boot after ram upgrade

I have a Dell Optiplex GX520 desktop (it's abount 5 yr old) PC with 512 MB DDR2 RAM. Since my computer always swapping I thought I should upgrade my RAM. I bought a Kingmax 2GB DDR2 RAM. But my system ...
5
votes
5answers
417 views

Why 32bits OSs can't address more than 3.2/3.2 gb of memory?

Don't know if this is the right place to ask this question. I've been reading that 32bit OSs (like the Ubuntu i'm running right now) can't adress more than 3.2gb or 3.3gb of RAM memory. I remember ...
4
votes
1answer
2k views

Tools to view/edit user space memory of running processes?

Are there any tools to view/edit user space memory of running processes on Linux? It would be a great learning tool.
3
votes
7answers
643 views

Why do I have less memory with 32 bit OS [duplicate]

Possible Duplicate: Will Windows 7 32 bit edition support 8 GB RAM? I have a brand new machine at work, i7 quad core with 8GB of ram. Mainly, I use it to develop JAVA applications using ...
0
votes
2answers
664 views

Which Windows OS Supports 8 GB RAM in a Laptop and Suggestions for a Better Laptop for Personal & Developer Use [closed]

I am about to purchase a laptop and have zeroed on the following two of them. Toshiba L500-ST2544 Toshiba L505-ES5034 The Common Specification for both of them are as follows - RAM - 4GB DDR3 ...