Information om | Engelska ordet PREFETCH

Exempel på hur man kan använda PREFETCH i en mening

• Modern designs try to eliminate or hide them using a variety of techniques: CPU caches, instruction pipelines, instruction prefetch, branch prediction, simultaneous multithreading and others.
• Fetching the instruction opcodes from program memory well in advance is known as prefetching and it is served by using a prefetch input queue (PIQ).
• Their disadvantages include the need for multiple chained pointer indirections to access an element, and the extra work required to determine the next row in an n-dimensional array to allow an optimising compiler to prefetch it.
• Procedural Synthesis Technology (XPS): During read streaming into the CPU, a custom prefetch instruction, extended data cache block touch (xDCBT) prefetches data directly to the L1 data cache of the intended core, which skips putting the data in the L2 cache to avoid thrashing the L2 cache.
• If this is done, Windows will need to re-create all the prefetch files again, thereby slowing down Windows during boot and program starts until the prefetch files are created—unless the prefetcher is disabled.
• Unlike previous generations of DDR memory, prefetch has not been increased above the 8n used in DDR3; the basic burst size is eight 64-bit words, and higher bandwidths are achieved by sending more read/write commands per second.
• Software prefetching works well only with loops where there is regular array access as the programmer has to hand code the prefetch instructions, whereas hardware prefetchers work dynamically based on the program's behavior at runtime.

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