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The hit ratio of a cache describes how often a searched-for item is found. More efficient replacement policies track more usage information to improve the hit rate for a given cache size. The latency of a cache describes how long after requesting a desired item the cache can return that item when there is a hit.
A CPU cache is a hardware cache used by the central processing unit (CPU) of a computer to reduce the average cost (time or energy) to access data from the main memory. [1] A cache is a smaller, faster memory, located closer to a processor core, which stores copies of the data from frequently used main memory locations.
Note that 3 shows a swap chain with three buffers; the original definition of triple buffering would throw away frame C as soon as frame D finished, and start drawing frame E into buffer 1 with no delay. Set 4 shows what happens when a frame (B, in this case) takes longer than normal to draw. In this case, a frame update is missed.
The unified page cache operates on units of the smallest page size supported by the CPU (4 KiB in ARMv8, x86 and x86-64) with some pages of the next larger size (2 MiB in x86-64) called "huge pages" by Linux. The pages in the page cache are divided in an "active" set and an "inactive" set. Both sets keep a LRU list of pages.
A frame buffer may be designed with enough memory to store two frames worth of video data. In a technique known generally as double buffering or more specifically as page flipping, the framebuffer uses half of its memory to display the current frame. While that memory is being displayed, the other half of memory is filled with data for the next ...
The placement determines whether the cache uses physical or virtual addressing. If the cache is virtually addressed, requests are sent directly from the CPU to the cache, and the TLB is accessed only on a cache miss. If the cache is physically addressed, the CPU does a TLB lookup on every memory operation, and the resulting physical address is ...
If no free space exists in the cache, this marker also determines whether either T1 or T2 will evict an entry. Hits in B1 will increase the size of T1, pushing ^ to the right. The last entry in T2 is evicted into B2. Hits in B2 will shrink T1, pushing ^ back to the left. The last entry in T1 is now evicted into B1.