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Bert22306
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re: Will Moore's Law doom multicore?
Bert22306   3/11/2013 8:19:47 PM
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"Amdahl's Law tells us that even with an infinite number of cores, an application that is 50% parallelizable will get only a 2x speedup over a single-core design." The key words are "an application." There are often multiple applications vying for CPU cycles, all running at the same time. So in fact, I can show how a quad-core processor shows up as only 25 percent busy, or slightly more than that, when the same app running on a single core eats up 100 percent of CPU cycles. I've read, though, that memory buses of today show no improvement beyond what you can eek out of an 8-core processor. The problem being choreography, in essence.

pica0
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re: Will Moore's Law doom multicore?
pica0   3/12/2013 2:11:25 PM
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Many application used all day contain a damn lot of tasks that can be performed in parallel. Just take an editor frame as example: rendering, spell check and syntax or grammar check can be performed in seperate threads. The fact most application are designed with a single core in mind does not imply, the application does nit contain paralellism.



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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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