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An Analysis of the Performance Impact of Wrong-Path Memory References on Out-of-Order and Runahead Execution Processors

Overview High-performance out-of-order processors spend a significant portion of their execution time on the incorrect program path even though they employ aggressive branch prediction algorithms. Although memory references generated on the wrong path do not change the architectural state of the processor, they can affect the arrangement of data in the memory hierarchy. This paper examines the effects of wrong-path memory references on processor performance. It is shown that these references significantly affect the IPC (Instructions Per Cycle) performance of a processor. Not modeling them can lead to errors of up to 10% in IPC estimates for the SPEC2000 integer benchmarks; 7 out of 12 benchmarks experience an error of greater than 2% in IPC estimates.

Further White Paper Details
Publisher	University of Texas	File Format	PDF
Date Published	January 2005
Format	White Papers
Topics	Memory Components, Processors, Software Engineering

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An Analysis of the Performance Impact of Wrong-Path Memory References on Out-of-Order and Runahead Execution Processors

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