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The theoretically optimal page replacement algorithm (also known as OPT, clairvoyant replacement algorithm, or Bélády's optimal page replacement policy) [3] [4] [2] is an algorithm that works as follows: when a page needs to be swapped in, the operating system swaps out the page whose next use will occur farthest in the future. For example, a ...
Bélády's algorithm is the optimal cache replacement policy, but it requires knowledge of the future to evict lines that will be reused farthest in the future. A number of replacement policies have been proposed which attempt to predict future reuse distances from past access patterns, [23] allowing them to approximate the optimal replacement ...
An accessed page is moved to the top of Stack S and any HIR pages at the stack's bottom are removed. For example, Graph (b) is produced after page B is accessed on Graph (a). When a HIR page in Stack S is accessed, it turns into a LIR page and accordingly the LIR page currently at Stack S’s bottom turns into a HIR page and moves to the top of ...
This phenomenon is commonly experienced when using the first-in first-out page replacement algorithm. In FIFO, the page fault may or may not increase as the page frames increase, but in optimal and stack-based algorithms like LRU, as the page frames increase, the page fault decreases. László Bélády demonstrated this in 1969. [1]
In computing, working set size is the amount of memory needed to compute the answer to a problem. In any computing scenario, but especially high performance computing where mistakes can be costly, this is a significant design-criteria for a given super computer system in order to ensure that the system performs as expected.
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Adaptive Replacement Cache (ARC) is a page replacement algorithm with better performance [1] than LRU (least recently used). This is accomplished by keeping track of both frequently used and recently used pages plus a recent eviction history for both. The algorithm was developed [2] at the IBM Almaden Research Center.
There are a large number of call-side actions, such as deactivation and truncation, and some ALM actions, such as the discovery of zeros by the page-writing primitive (write_page in page_fault) that cause page-frames to become explicitly free; these actions all aid the replacement algorithm and simplify its task by putting these page frames at ...