Multithreading (computer architecture): Difference between revisions

Revision as of 18:27, 7 April 2007

Revision as of 18:32, 7 April 2007

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====Concept====

The most advanced type of multi-threading applies to [[superscalar]] processors. A normal superscalar processor issues multiple instructions from a single thread every CPU cycle. In Simultaneous Multi-threading (SMT), the superscalar processor issues one instruction from multiple threads every CPU cycle. Recognizing that any single thread has a limited amount of [[instruction level parallelism]], this type of multithreading is trying to exploit available across multiple threads.

a single thread every CPU cycle. In Simultaneous Multi-threading (SMT), the superscalar processor issues one instruction from multiple

For example:

threads every CPU cycle. Recognizing that any single thread has a limited amount of [[instruction level parallelism]], this type of multithreading

is trying to exploit available across multiple threads.

# Cycle i, instruction j from thread A; instruction k from thread B both simultaneously issued

# Cycle i+1, instruction k+1 from thread B; instruction m from thread C both simultaneously issued

# Cycle i+2, instruction j+1 from thread A; instruction m+1 from thread C both simultaneously issued

====Terminology====