Hitting the Memory Wall: Implications of the Obvious Win. A. W u l f Sally A. M c K e e Department of C o m p u t e r Science University of Virginia {wulf i mckee }@ virginia.edu D e c e m b e r 1994 This brief note points out something obvious m something the authors " k n e w " without really understanding. With apologies to those who did understand, we offer it to those others who, like us, missed the point. We all k n o w that the rate of i m p r o v e m e n t in microprocessor speed exceeds the rate o f i m p r o v e m e n t in D R A M m e m o r y speed, each is i m p r o v i n g exponentially, but the exponent for microprocessors is substantially larger than that for D R A M s . The difference between diverging exponentials also grows exponentially; so, although the disparity between processor and m e m o r y speed is already an issue, d o w
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