Author: Francesco Di Tolla
Date: 01:56:02 10/15/99
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>Most duals don't do this, and memory becomes a bottleneck. Even with two >cpus, it is not uncommon to see applications run only 1.5 times faster because >of the memory bandwidth (or lack thereof). If parallel computing was just adding new cpu's then a pc with 4 cpu would cost like a normal pc+the cost of the extra 3 cpu. Of course the key point in parallel computing is the bandwidth to the memory, a number most of the people don't pay enough attention to the first time they look at a multiprocessor compute. What makes Cray computer so different respect to other, cheaper, parallel computer is the huge bandwith. Of course there are problems for which shared memory is not required, so that a distributet memory parallel machine, with local buses, si enough. By the way Bob, do you know which of the parallel programs around work on distributed memory machines? and how do they handle a position that shows up in two different heads? regards Franz
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