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Another link to a PDF:

7 posted on 02/11/2013 12:33:37 PM PST by Ernest_at_the_Beach ((The Global Warming Hoax was a Criminal Act....where is Al Gore?))
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Selected Excerpts from the avove PSF:


Multiprocessing in Mobile Platforms: the Marketing and the Reality

Marco Cornero, Andreas Anyuru ST-Ericsson


During the last few years the mobile platforms industry has aggressively introduced multiprocessing in response to the ever increasing performance demanded by the market. Given the highly competitive nature of the mobile industry, multiprocessing has been adopted as a marketing tool. This highly visible, differentiating feature is used to pass the oversimplified message that more processors mean better platforms and performance. The reality is much more complex, because several interdependent factors are at play in determining the efficiency of multiprocessing platforms (such as the effective impact on software performance, chip frequency, area and power consumption) with the number of processors impacting only partially the overall balance, and with contrasting effects linked to the underlying silicon technologies.

In this article we illustrate and compare the main technological options available in multiprocessing for mobile platforms, highlighting the synergies between multiprocessing and the disruptive FD-SOI silicon technology used in the upcoming ST-Ericsson products. We will show that compared to personal computers (PCs), the performance of single-processors in mobile platforms is still growing and how, from a software performance perspective, it is more profitable today to focus on faster dual-core rather than slower quad-core processors.

We will also demonstrate how FD-SOI benefits dual-core processors even more by providing higher frequency for the same power consumption, together with a wider range of energy efficient operating modes. All of this results in a simpler, cheaper and more effective solution than competing homogeneous and heterogeneous quad-processors.

Multiprocessing is a necessity, not a choice!

It is important to recall that multiprocessors are a necessity, not a choice. Historically they have been introduced in mainstream products such as PCs, once frequency scaling reached the chips’ heat dissipation limits - not before. Indeed since the beginning of silicon integration up until 2003-2005, the scaling of frequency and of the number of transistors have been used in mainstream computing mostly for single-processor evolutions (illustrated in Figure 1). During this period, applications performance simply scaled at the same rate as the hardware evolution, without the need to make any change to the growing software legacy, producing the phenomenal growth in computing that we have enjoyed in the past.

Figure 1....Intel CPU Trends......see the PDF


Enough copying....

8 posted on 02/11/2013 12:44:14 PM PST by Ernest_at_the_Beach ((The Global Warming Hoax was a Criminal Act....where is Al Gore?))
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