Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Using pages makes it easier to manage the whole memory, avoiding excessive fragmentation and waste. As an analogy, think of Tetris, but with only square blocks: it is relatively easy to avoid fragmentation in this case. Both the virtual and the physical memory are divided into pages. As an aside, we often refer to physical memory pages as frames. Every virtual page consists of a range of virtual addresses. Virtual pages are then mapped to physical pages in the physical memory. When an application needs to access a virtual page, the corresponding virtual address is translated into a "real" physical address, and then the actual data might be read and/or written. As a consequence, note that although arrays are contiguous in virtual memory, they may be non-contiguous in physical memory. Note also that some virtual pages do not map to any actual physical memory address, because not all virtual pages are necessarily being used at any given time. The unused virtual pages are called invalid. If a program ever tries to access an invalid page, it pagefaults.
A typical virtual memory layout includes a stack, a mmap region, a heap, and the code of the program (the "text" section). Since mmap and heap grow towards each other, in the worst case they could smash into each other. The same could happen with the stack: if a program recurses for a large number of times, the stack could grow over the mmap region ("stack over?ow") and in this case something bad and usually unpredictable will happen.
Processes- Making the System More Responsive and Useful A method by definition build up of a code execution and resource ownership. A process has two main characteristics, code
What is spooling? Spooling overlaps the I/O of single job with the computation of other jobs.
Define Middleware to Ease the Low-Level Protocol Burden Fortunately, many products are available today to ease the low-level protocol burden on the application programmer. Midd
what is multilevel page table and its applications?
Indexed allocation Indexed allocation bringing all the pointers together into one location: the index block. Every file has its own index block, which is an array of disk-block
Problem 1. What is kernel? What are the main components of a kernel? Defining Kernel Explaining Main components of Kernel 2. What is mutual exclusion? What are i
What is external fragmentation? As process are removed from and loaded to the memory free memory space is bracken into pieces .external fragmentation take place when enough mem
Explain why SSTF scheduling tends to favor middle cylinders over the innermost and outermost cylinders. The center of the disk is the location having the fewest average distanc
what common event leads to the creation of a process?
Question: (a) Explain the similarities and differences between two different threads running in the same process and two independent processes. When would you want to use two t
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd