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Unformatted text preview: k s13 128k s11 32k stride (words) s15 Figure 6.42: The memory mountain. The geography of the Xeon mountain reveals a rich structure. Perpendicular to the size axis are three ridges that correspond to the regions of temporal locality where the working set fits entirely in the L1 cache, the L2 cache, and main memory respectively. Notice that there is an order of magnitude difference between the highest peak of the L1 ridge, where the CPU reads at a rate of 1 GB/s, and the lowest point of the main memory ridge, where the CPU reads at a rate of 80 MB/s. There are two features of the L1 ridge that should be pointed out. First, for a constant stride, notice how the read throughput plummets as the working set size decreases from 16 KB to 1 KB (falling off the back side of the ridge). Second, for a working set size of 16 KB, the peak of the L1 ridge line decreases with increasing stride. Since the L1 cache holds the entire working set, these features do not reflect the true L1 cache performance. Th...
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This note was uploaded on 09/02/2010 for the course ELECTRICAL 360 taught by Professor Schultz during the Spring '10 term at BYU.

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