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Что (кто) такое prefetch - определение
WIKIMEDIA DISAMBIGUATION PAGE
Prefetch; Pre-fetching; Prepaging
Найдено результатов: 21
prefetch
[pri:'f?t?]
¦ verb Computing transfer (data) from main memory to temporary storage in readiness for later use.
prefetch
Prefetching
Prefetching in computer science is a technique for speeding up fetch operations by beginning a fetch operation whose result is expected to be needed soon. Usually this is before it is known to be needed, so there is a risk of wasting time by prefetching data that will not be used.
prepaging
<architecture> (Or "working set model") A technique whereby
the operating system in a paging virtual memory
multitasking environment loads all pages of a process's
working set into memory before the process is restarted.
Under demand paging a process accesses its working set by
page faults every time it is restarted. Under prepaging the
system remembers the pages in each process's working set and
loads them into physical memory before restarting the process.
Prepaging reduces the page fault rate of reloaded processes
and hence generally improves CPU efficiency.
["Modern Operating Systems", Andrew S. Tanenbaum,
pub. Prentice Hall, Inc. 1992 ].
(1998-04-23)
Prefetch input queue
CPU OPTIMIZATION UNIT
Prefetch Input Queue; Prefetch queue
Fetching the instruction opcodes from program memory well in advance is known as prefetching and it is served by using prefetch input queue (PIQ).The pre-fetched instructions are stored in data structure - namely a queue.
instruction prefetch
COMPUTER PROCESSING TECHNIQUE TO BOOST MEMORY
Instruction prefetch; Cache Prefetching
<architecture> A technique which attempts to minimise the time
a processor spends waiting for instructions to be fetched
from memory. Instructions following the one currently being
executed are loaded into a prefetch queue when the processor's
external bus is otherwise idle. If the processor executes a
branch instruction or receives an interrupt then the queue
must be flushed and reloaded from the new address.
Instruction prefetch is often combined with pipelining in
an attempt to keep the pipeline busy.
By 1995 most processors used prefetching, e.g. {Motorola
680x0}, Intel 80x86.
[First processors using prefetch? ]
(1998-03-29)
Cache prefetching
COMPUTER PROCESSING TECHNIQUE TO BOOST MEMORY
Instruction prefetch; Cache Prefetching
Cache prefetching is a technique used by computer processors to boost execution performance by fetching instructions or data from their original storage in slower memory to a faster local memory before it is actually needed (hence the term 'prefetch'). Most modern computer processors have fast and local cache memory in which prefetched data is held until it is required.
superpipelined
METHOD OF IMPROVING INSTRUCTION-LEVEL PARALLELISM
Instruction Prefetch Queue; Superpipelined; Deep pipelining; Pipelined CPU; Prefetch instruction queue; Superpipeline; Pipelined processor; Instruction pipeline
1. Traditional pipelined architectures have a single
pipeline stage for each of: instruction fetch, instruction
decode, memory read, ALU operation and memory write. A
superpipelined processor has a pipeline where each of
these logical steps may be subdivided into multiple pipeline
stages.
2. Marketese for pipelined.
Instruction pipelining
METHOD OF IMPROVING INSTRUCTION-LEVEL PARALLELISM
Instruction Prefetch Queue; Superpipelined; Deep pipelining; Pipelined CPU; Prefetch instruction queue; Superpipeline; Pipelined processor; Instruction pipeline
In computer science, instruction pipelining is a technique for implementing instruction-level parallelism within a single processor. Pipelining attempts to keep every part of the processor busy with some instruction by dividing incoming instructions into a series of sequential steps (the eponymous "pipeline") performed by different processor units with different parts of instructions processed in parallel.
Link prefetching
ACCOUNT NUMBER
DNS prefetching
Link prefetching allows web browsers to pre-load resources. This speeds up both the loading and rendering of web pages.
Википедия
Prefetching
Prefetching in computer science is a technique for speeding up fetch operations by beginning a fetch operation whose result is expected to be needed soon. Usually this is before it is known to be needed, so there is a risk of wasting time by prefetching data that will not be used. The technique can be applied in several circumstances:
- Cache prefetching, a speedup technique used by computer processors where instructions or data are fetched before they are needed
- Prefetch input queue (PIQ), in computer architecture, pre-loading machine code from memory
- Link prefetching, a web mechanism for prefetching links
- Prefetcher technology in modern releases of Microsoft Windows
- Prefetch instructions, for example provided by
PREFETCH, an X86 instruction in computing
- Prefetch buffer, a feature of DDR SDRAM memory
- Swap prefetch, in computer operating systems, anticipatory paging
