Simultaneous multithreading - blending thread-level and instruction-level parallelism in advanced microprocessors
J. Šilc, B. Robič, T. Ungerer
WSES Press, 2001, 338-343
The paper discusses the reasons and possibilities of exploiting thread-level parallelism in modern microprocessors. The performance of a superscalar processor suffers when instruction-level parallelism is low. The underutilization due to missing instruction-level parallelism can be overcome by simultaneous multithreading, where a processor can issue multiple instructions from multiple threads each cycle. Simultaneous multithreaded processors combine the multithreading technique with a wide-issue superscalar processor such that the full issue bandwidth is utilized by potentially issuing instructions from different threads simultaneously. Depending on the specific simultaneous multithreaded processor design, only a single instruction pipeline is used, or a single issue unit issues instructions from different instruction buffers simultaneously.
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