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rick merritt
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Two approaches to Big/Little
rick merritt   8/5/2013 11:33:23 AM
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ARM detailed itds two approaches to Big Little at ARM Tech Con last year:

http://www.eetimes.com/document.asp?doc_id=1262724

Apparently Samsung got to market first with the clsutered approach and Mediatek opted to be first with the more sophisticated MP approach that took a little longer to mature.

I would expect all the ARM SoC guys will move to MP with their next gen products.

Tom Murphy
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Quad or Octa?
Tom Murphy   8/5/2013 11:38:13 AM
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I'd be interested in hearing more about the Quad vs Octa considerations in the Samsung case.  How does that affect performance?  Is it like a quad or octa?

Peter Clarke
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Re: Two approaches to Big/Little
Peter Clarke   8/5/2013 11:45:39 AM
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Renesas also did a clustered migration big-little chip.

However, until we can get confirmation that any upcoming MediaTek octa-core chips are hetereogeneous we don't know that are adopting what ARM calls "global task scheduling."

There is reference in the video to the use of software to optimize for performance or efficiency but there is NO reference to big, little or ARM.

 

 

Susan Rambo
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Programming an Octa?
Susan Rambo   8/5/2013 1:03:18 PM
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What issues will the octa-core bring to engineers designing with it? I know some embedded systems engineers were dubious about multicore. However, software developers should welcome the challenge, maybe....In this Feb 2013 article from Multicore Association, the association claims: "The multicore era shifts more of the responsibility for performance gains onto the software developer who must direct how work is distributed amongst the cores. In the future, the number of cores integrated onto one processor is expected to increase, which will place even greater burden on the software developer."

junko.yoshida
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Re: Two approaches to Big/Little
junko.yoshida   8/5/2013 6:40:28 PM
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well, i would hate to say it, but this is what happens when a company "pre-announces" something -- prematurely. i can see MTK couldn't resist getting into the octa-core fray -- because there is so much buzz going on in the media -- and yet not being able talk about it in detail (until they have products later this year) sort of does disservice to the industry and also to itself. Speculation moves fast, and there goes the real opportunity for MTK to tell its own story in its own terms.

Peter Clarke
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Re: Programming an Octa?
Peter Clarke   8/6/2013 5:02:16 AM
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There are major issues for programming heterogeneous multicore processors. 

The clustered migration approach adopted by Samsung in Exynos Octa 5 has the advantage of presenting a uniprocessor programming model to the software engineer.

When you get into the global task scheduling across big, little and graphics cores you need to have a task schedular that can - moment-by-moment - pay attention to workloads, available resources and what runs best where.

Not only do those algorithms need to be smart, prioritized, they need to be debugged to make sure that tasks don't end up blocking each other or getting into wasteful behaviors.

This software will normally sit somewhere near the operating system and so starts to be a non-SoC provider issue.

Like it all theses good things it requires team work.

My understanding is that ARM is uploading software for this for Linux through Linaro.

 

 

 

Caleb Kraft
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Re: Two approaches to Big/Little
Caleb Kraft   8/6/2013 9:09:54 AM
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Yes announcing before they have a showable item is like shooting themselves in the foot, since they can't defend themselves against criticism. They don't have a product to showcase and tout results from. The criticism from qualcom came at an optimal time (for qualcom) because all MT can do is wait.

junko.yoshida
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Re: Programming an Octa?
junko.yoshida   8/6/2013 9:46:13 AM
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To MTK's defense, we do know the following. This is what MTK disclosed when it announced its quad-core AP for tablet using HMP. 

While ARM enables HMP with its IP and software, MediaTek claimsit also added things like "an advanced scheduler algorithm, combined with adaptive thermal and interactive power management" to maximize performance and energy efficiency of the ARM big.LITTLE architecture. "This technology enables application software to access all of the processors in the big.LITTLE cluster simultaneously for a true heterogeneous experience," the Taiwanese company said.

JimMcGregor
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Re: Programming an Octa?
JimMcGregor   8/6/2013 1:09:21 PM
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Programming is an will continue to bean issue as the number of cores increases. Some would argue that they have already reached a point of diminishing returns. However, the programmingmodels will evolve, especially as these are used in mobile devices and other applications that are doing a wide variety of functions driven not just by the user, but also cloud services, sensors, and other background applications.

The real point of the new MediaTek processor is that this is an all-LITTLE solution, as opposed to a big.LITTLE architecture like the Samsung Exynos Octa. These Coretex-A7 cores are about a fifth or the size and power of the Coretex-A15 cores. The result will be a much small chip with much lower power consumption. This opens up new possibilities for lower power and lower cost devices.

rick merritt
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Re: Programming an Octa?
rick merritt   8/6/2013 2:08:40 PM
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@Jim: I agree. We have seen mainstream chips pretty quickly jump from one to two to four to eight cores. But at this stage we seem to be getting into a more hetero world where its a bunch of mixed cores for specilized jobs, in part because the existing tools and jobs only parallelize so much.

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