Multicore - William Stallings Computer Organization and...

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William Stallings Computer Organization and Architecture 8 th Edition Chapter 18 Multicore Computers
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Some Definitions Bandwidth (data/time): physical (electrical) limit on how fast you can push electrons typically speed of a wire x number of wires Throughput (data/time): delivered (total) data flow after factoring in OS, hardware, and protocol overhead Latency (time): amount of time necessary to return a result Think about filling your gas tank… latency = time from pulling lever to start of gas flow into tank throughput = how fast tank fills
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Hardware Performance Issues Microprocessors have seen an exponential increase in performance Improved organization Increased clock frequency Increase in Parallelism Pipelining Superscalar Simultaneous multithreading (SMT) Diminishing returns More complexity requires more logic Increasing chip area for coordinating and signal transfer logic Harder to design, make and debug
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Alternative Chip Organizations
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Intel Hardware Trends
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Increased Complexity Power requirements grow exponentially with chip density and clock frequency Can use more chip area for cache Smaller Order of magnitude lower power requirements By 2015 100 billion transistors on 300mm 2 die Cache of 100MB 1 billion transistors for logic Pollack’s rule: Performance is roughly proportional to square root of
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This note was uploaded on 11/01/2010 for the course INFS 515 taught by Professor Masiyowski,j during the Fall '08 term at George Mason.

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Multicore - William Stallings Computer Organization and...

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