Multithreaded processor efficiency by pre-fetching...

Details Multithreaded processor efficiency by pre-fetching... Multithreaded processor efficiency by pre-fetching...

2005-11-15

2005-11-15

Treat, William M. (Department: 2183)

Electrical computers and digital processing systems: processing

Instruction fetching

Prefetching

Reexamination Certificate

active

06965982

ABSTRACT:
A method and processor architecture are provided that enables efficient pre-fetching of instructions for multithreaded program execution. The processor architecture comprises an instruction pre-fetch unit, which includes a pre-fetch request engine, a pre-fetch request buffer, and additional logic components. A number of pre-defined triggers initiates the generation of a pre-fetch request that includes an identification (ID) of the particular thread from which the request is generated. Two counters are utilized to track the number of threads and the number of executed instructions within the threads, respectively. The pre-fetch request is issued to the lower level cache or memory and returns with a corresponding cache line, tagged with the thread ID. The cache line is stored in the pre-fetch request buffer along with its thread ID. When the particular thread later requires the instruction, the instruction is provided from within the pre-fetch request buffer at a shorter access latency than from the lower level cache or memory.

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The Authoritive DIctionary on Standard IEEE Terms; IEEE Press; 2000; 7th Edition; p. 870.

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