Difference between revisions of "CSC103: DT's Notes 1"
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But there's a problem with the speed at which processors and memory have improved. While processors have doubled performance every two years for almost four decades now, memory has not. At least not as fast, and it appears that it is now not improving at all. The figure below taken from an article by Sundar Iyer for EETimes<ref name="Iyer">Sundar Iyer, Breaking through the embedded memory bottleneck, part 1, ''EE Times'', July 2012, http://www.eetimes.com/document.asp?doc_id=1279790</ref> shows the gap existing between | But there's a problem with the speed at which processors and memory have improved. While processors have doubled performance every two years for almost four decades now, memory has not. At least not as fast, and it appears that it is now not improving at all. The figure below taken from an article by Sundar Iyer for EETimes<ref name="Iyer">Sundar Iyer, Breaking through the embedded memory bottleneck, part 1, ''EE Times'', July 2012, http://www.eetimes.com/document.asp?doc_id=1279790</ref> shows the gap existing between | ||
the performance of processors compared to that of memory. The bad news is that the processor has been getting faster at doing computation, but memory has not been able to keep up the pace, so processors are in effect limited and it doesn't seem that there is a solution in sight. At least not one that uses the currently semiconductor technology. | the performance of processors compared to that of memory. The bad news is that the processor has been getting faster at doing computation, but memory has not been able to keep up the pace, so processors are in effect limited and it doesn't seem that there is a solution in sight. At least not one that uses the currently semiconductor technology. | ||
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That's one aspect of the Von Neumann bottleneck. Using our previous metaphor of the cookie monster, it is akin to having our cookie monster walking on a treadmill where cookies are dropped in front of him at regular intervals, and the cookie monster is becoming faster and faster at walking the treadmill and eating cookies, but the treadmill, while increasing in speed as well, is not able to keep up with the cookie monster. | That's one aspect of the Von Neumann bottleneck. Using our previous metaphor of the cookie monster, it is akin to having our cookie monster walking on a treadmill where cookies are dropped in front of him at regular intervals, and the cookie monster is becoming faster and faster at walking the treadmill and eating cookies, but the treadmill, while increasing in speed as well, is not able to keep up with the cookie monster. | ||
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Revision as of 23:41, 28 September 2013
--© D. Thiebaut 08:10, 30 January 2012 (EST)
