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Runahead execution: An effective alternative to large instruction windows

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4 Author(s)
Mutlu, O. ; Texas Univ., Austin, TX, USA ; Stark, J. ; Wilkerson, C. ; Patt, Y.N.

An instruction window that can tolerate latencies to DRAM memory is prohibitively complex and power hungry. To avoid having to build such large windows, runahead execution uses otherwise-idle clock cycles to achieve an average 22 percent performance improvement for processors with instruction windows of contemporary sizes. This technique incurs only a small hardware cost and does not significantly increase the processor's complexity.

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Micro, IEEE  (Volume:23 ,  Issue: 6 )