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What are types of memory allocation?
There are two types of memory allocations. 1. Static memory allocation 2. Dynamic memory allocation
What Linked list uses.type of memory allocation?
Linked lists use dynamic memory allocation (also called "heap memory allocation", as the linked list is stored in heap memory).
Describe the major disadvantages for memory allocation schemes?
= for memory allocation schemes? = http://wiki.answers.com/Q/FAQ/2096= for memory allocation schemes? = http://wiki.answers.com/Q/FAQ/2096
What is the use of Constructor with Dynamic allocation?
Constructors are necessary to initialize classes. It allows to avoid to a lot of problems with unauthorized access of memory. Dynamic allocation makes possible allocation of memory during execution of program. If you do not use dynamic allocation, all required memory will be allocated during initialization phase (constructors are usually responsible for that). But you can't use more memory. Dynamic allocation was designed to overcome such problems.
Is an operating system responsible for managing processor time and memory allocation?
The processor time is a function of the processor. The memory allocation is a function of the operating system.
What are the recent memory management schemes?
Single-user contiguous Fixed Partitions Dynamic Partitions Relocatable Dynamic Partitions Paged Memory Allocation Demand Paging Working Set Segmented Memory Allocation Segmented/Demand Page Memory Allocation -------Taken from "Understanding Operating Systems. 6th edition pg 99
What is difference between demand paging n pure demand paging?
In demand paging, a page is not loaded into main memory until it is needed. In pure demand paging, even a single page is not loaded into memory initially. Hence pure demand paging causes a page fault. Page fault, the situation in which the page is not available whenever a processor needs to execute it.
What is a memory characteristic where an application can request a specific item from memory?
Demand Paging
What is segmented page allocation?
Segmented page allocation is a type of memory management that uses base and bound registers to determine memory faults, similar to dynamic page allocation. More importantly it is different to dynamic page allocation since the entire process doesn't have to be in memory, similar to using virtual memory paging where the program is broken into pieces. Unlike virtual memory paging, the maximum virtual memory size is limited to the size of physical memory.
What is paging?
Paging is a memory management scheme, in which data is fetched from the disk to memory in the form of equal size blocks called pages.paging is a method for allowing the non-contiguous allocation of memory space to processes when nedded.
Explain how virtual memory system using demand paging?
Demand paging is a process which involves the copying and relocation of data from a secondary storage system to random access memory (RAM), a main memory storage system. Demand paging copies and relocates data to facilitate the fastest access to that data. Once the data is relocated, demand paging sends a command to the operating system to inform it that the data file or files are now ready to be loaded. Demand paging is performed on demand, or after a command has been sent to retrieve specific data.
What is contiguous allocation?
Paging is a memory management scheme that permits the physical- address space of process to be noncontiguous.
What are the differences between simple paging and virtual memory paging?
In case of simple paging all pages should be in main memory to run a process..while in case of virtual memory paging pages can be loaded as needed by the processor i.e. called demand paging...
What is demand paging in Unix?
In computer operating systems, demand paging is an application of virtual memory. In a system that uses demand paging, the operating system copies a disk page into physical memory only if an attempt is made to access it (i.e., if a page fault occurs). It follows that a process begins execution with none of its pages in physical memory, and many page faults will occur until most of a process's working set of pages is located in physical memory. This is an example of lazy loading techniques.
Why are segmentiation and paging sometimes combined into one scheme?
Segmentation and paging are combined in a scheme called Segmented Paging to leverage the benefits of both techniques. This allows for efficient management of memory by dividing it into segments based on logical partitions and further dividing those segments into pages for optimized memory utilization and protection. Segmenting helps in managing variable-sized data structures, while paging streamlines memory allocation and reduces fragmentation. By combining these two strategies, Segmented Paging enhances memory management and provides more flexibility in handling memory access and protection.
The technique of swapping items between memory and storage?
It is paging.
What is the Difference between paging and demand paging in operating system?
paging is the process of memory management in which memory is allocated in the non contiguous form,i.e. the program is break into block of fixed size known as page and also the main memory also break down into block of same size known as frame or page frame. Now all this page are brought into the main memory but in the space available so they can be contiguous if they find whole space required by the program or if the space is available but in scattered form then they can give space in non contiguous form. But in demand paging only those pages are brought into main memory which are required to execute the program at that time when a program need other pages it will swap out the unused pages from the main memory and swap in the desired page thus allowing it to execute the program though the space available is not sufficient to bring the whole program into main memory..................One of the problem arises due to demand paging is page fault which is caused due to required page not found in main memory for which we require swapping. hey if you like my post don't forget to thank me....... for any further queries e-mail me at hemant_spidey3@yahoo.co.in or 1989hemantrajput@gmail.com
