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We will brie?y introduce paging to ?nish off this lecture. When a process is loaded, not all of the pages are immediately loaded, since it's possible that they will not all be needed, and memory is a scarce resource. The process' virtual memory address space is broken up into pages, and pages which are valid addresses are either loaded or not loaded. When the MMU encounters a virtual address which is valid but not loaded (or "resident") in memory, then the MMU issues a pagefault to the operating system. The OS will then load the page from disk into RAM, and then let the MMU continue with its address translation. Since access times for RAM are measured in nanoseconds, and access times for disks are measured in milliseconds, excessive pagefaults will clearly hurt performance a lot.
Define thread cancellation & target thread. The thread cancellation is the task of terminating a thread before it has completed. A thread that is to be cancelled is often refer
is the operating system windows sometimes interupts
Define the Server Communications Module or SCM The Server Communications Module (SCM) performs many necessary functions. The SCM responsible for establishing, maintaining, and
Explain the Per Thread Scoping Thread-level programming introduces new twists for application-level variable scoping. Threads are commonly used in one of two ways. To ex
Produce a referenced four page report which describes the possible functionality of the system; similar systems that are out there and different possible approaches to delivering t
Hierarchical paging Single way is to use a two-level paging algorithm, in which the page table itself is also paged. A logical address is separated into a page number and a pag
Define race condition. When various process access and manipulate similar data concurrently, then the outcome of the execution depends on certain order in which the access take
Define Disadvantages of Top Down parsing of Backtracking The disadvantages of top down parsing of backtracking: (i) Semantic actions cannot be carried out while making a pr
prepare electricity bill without using file
what are the factors influencing the choice of a mode of transportation?
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