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!
In modern operating systems, applications do not directly access the physical memory. Instead, they use so-called virtual memory, where each virtual address is translated to a physical address. Why would one do this? Here are some of the reasons that virtual memory is useful:
To isolate and protect processes from each other,
To manage the limited physical memory ef?ciently,
To give each process the illusion of having the whole address space for itself.
Since each program thinks it has the whole memory to itself, programs can use a lot of virtual memory. In fact, a computer might use huge amounts of virtual memory, much more than the amount of actual physical memory available. Most of the time this works fairly well, since processes typically only need to use a small amount of their virtual memory at once, and often a lot can be shared among processes (such as with shared libraries). But if the system gets into a situation where the active virtual memory demands exceed the available physical memory, we will need to use another mechanism, such as "swapping" memory pages to disk.
Virtual memory uses one level of indirection in the translation from virtual addresses to physical addresses.
Question : (a) The dynamic allocation problem is how to satisfy a request of size n from a list of free holes into memory. The best-fit, first-fit and worst-fit strategies are
Note that the parameter for scanf doesn't need the address operators & because name is an address. However the variable name has no defined space. This can cause problems within C
When a computer is started on, the program that executed first is named the ''operating system.'' It controls pretty much all applications in the computer. This adds who logs in, h
Define Segmentation The memory allocation method subject to “external” fragmentation is Segmentation.
What are the three main activities of an operating system in regard to secondary-storage management? a) Free-space management. b) Storage allocation. c) Disk scheduling.
Q. Distinguish among PCS and SCS scheduling. Answer: PCS scheduling is completed local to the process. It is how a thread library schedules threads onto available LWPs. SCS sch
Referring to Figure below, discuss how you would alter the circuit to obtain: 1. a straightforward amplifier with gain 1, 2. a straightforward amplifier with gain 10, 3. a
Vyvtvtn8
How many disk operations are needed to fetch the i-node for the file /usr/ast/courses/os/handout.t? Assume that the i-node for the root directory is in memory, but nothing else alo
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
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