I saw that on a 64 bit windows OS the user virtual address space available is 8 terra bytes. But if the program we are executing on this is running in 32 bit compatibility mode is this much of user space still available ? or does it behave like a normal 32 bit OS and gives only 2GB user address space? ...
I'm writing a diagnostic app which needs to log what the user has set as his user-mode space a.k.a. user-mode virtual address space a.k.a. the /3GB switch in WinXP or the increaseuserva switch in bcdedit on Vista/Win7. Either of C++ or C++/CLI will do. Any ideas ? ...
Just reading some notes in a purdue lecture about OSs, and it says: A program sees memory as an array of bytes that goes from address 0 to 2^32-1 (0 to 4GB-1) Why 4 GB? ...
I'd like to know how it works - whether it checks if process can read/write/execute memory on every access, or it does it only once? But when it does it only once, and all processes are in a single address space, how are these other hostile processes are prevented from accessing memory from not their's areas? How is it solved in Mungi OS...
I'm a bit confused about pure segmentation due to in my head always existed the idea of virtual memory. But as I understand pure segmentation is also imagining a virtual address space, divided in segments that are ALL loaded in RAM. The difference with virtual memory with segmentation, is that possibly there's some segment that it's no...
I have taken a course about Operating System design and concept and now I am trying to study Linux kernel thoroughly. I have a question that I cannot get rid of. In modern operating systems each process has own virtual address space(VAS) (eg, 0 to 2^32-1 in 32-bit systems). This provides many advantages. But in the implementation I am co...
This question is aimed at any OS using a VAS model, but I'm going to specify windows nt, since that's the system I know best. As we all know, by default, processes on 32 bit windows get 2 GB of memory all by itself. This memory can be located in system memory, a swap file, an usb drive etc. This means that several processes can have al...