By John L. Hennessy & David Patterson

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A sequential stream buffer would not help with fetching the column entries for the matrix transposition. The round-robin allocation policy combined with only two stream buffers would also mean that useful data prefetched in response to row prefetches would be replaced before it could be used by useless prefetches of sequential blocks after column misses. So 0% are useful. 9 a. Solutions will vary. b. Solutions will vary. 10 a. A 1 GB DRAM with parity or ECC effectively has 9-bit bytes and would require 18 512 Mb DRAMs.

With 1 bit flip per GB per month, assuming a 30-day month, you get a bit flip on average once every 3 days in your 10 GB data set. Hence, to avoid a second bit flip corrupting another block in the same file, you should scan every few days or so to repair the likely flipped bit. 6 Chapter 6 Solutions ■ L-61 sophisticated answer could take the file size distribution into account, but we leave that as an exercise for someone else. b. Because it takes 100 seconds to scan a GB (and thus detect and potentially correct a single bit flip), if we get more than 1 bit flip every 100 seconds, we are in trouble.

Hence, these show up as small blips (on L3) just above the baseline (L2). d. 1 ms; determined by the difference between L2 and L4. Similar to above, when a cylinder is exhausted, a switch must occur to the next one. These show up as (larger) blips (on L4) above the baseline (L2). e. 15 heads; determined by counting the number of head switches that occur between the first two cylinder switches (labeled H on the graph). 36. 36 Results from running Skippy on Disk Beta. The minimal transfer time determines the y-axis value of point 3 (P3).