Embedded Systems Conference
Breaking News
Newest First | Oldest First | Threaded View
User Rank
re: Video: mobile chips are like pizza
TanjB   8/6/2012 5:37:30 PM
I disagree. Look up Amdahl's law, it shows how the serial parts of the algorithm can become a large block. The stuff we know how to make parallel, like graphics, is embarrassingly parallel and the HW does that well. But just sticking 4 CPUs on a die is not "mission accomplished". A real world algorithm has to balance using multiple CPUs against competition for DRAM and cache (both of which are easily maxed out on mobile chips)and the additional complexity of synchronization. It often is the case that the small net gain is simply not worth the complexity and cost of development. On PCs the large wins, for consumer scenarios, have been running completely different tasks on the different cores. The chips have monstrous DRAM bandwidth and big caches, along with multi-watt budgets, that make that practical. In the mobile space that does not work nearly as well. So for the HW engineer who figures 4 cores on a chip is job done, no, the work has barely started on figuring out how to make mobile chips that really perform on battery power. You will see those 4 cores, and the GPU, coordinate in a few specific high-value scenarios worth the very expensive software engineering to fit useful gains within the chip limits, but we are nowhere near done with figuring out the HW.

User Rank
re: Video: mobile chips are like pizza
SylvieBarak   8/6/2012 12:44:42 AM
Right. The hardware is there, the software is not quite at that level yet.

Luis Sanchez
User Rank
re: Video: mobile chips are like pizza
Luis Sanchez   8/5/2012 9:41:03 PM
Nice video. Your final question made me think of actually what is happening in having multi-core processors today. Parallel programming is an on-going research topic. Having 2 or 4 or more cores on one single package does make it twice or quad times more powerful however, the software requires a great deal of effort to be designed in order to seize all that parallel execution capacity. So far, looks like software development is behind hardware in this regards, right?

User Rank
re: Video: mobile chips are like pizza
Bert22306   8/3/2012 8:34:48 PM
Excellent! I'm also a thin crust kind of guy, and fairly minimalist with the toppings. Tomato, cheese, and basil are always good, and some olive oil helps too. The crust needs to be crisp. The edges of the crust need to be a little browned, some might even call it burned. None of that soft chewy stuff. One problem with the constant downsizing is the same problem that occurs with space-based hardware. You get to the point that turning a transistor on and off becomes a stochastic event. In space, this is caused by radiation impinging on the transistors. With miniaturization, voltages have to be so low, to prevent arcing, and the traces are down to the atomic level, so it becomes more and more difficult to even know what it means to have current flow. Is it just leakage through the insulator? About image processing. You mentioned separating out the moving objects in an image from the static objects or background, to save on transmission bandwidth. This is the basic technique used in all of the MPEG compression variants. On the one hand, reduced transmission bandwidth has to save power. But on the other hand, when you increase the efficiency of the compression algorithm, you also increase the processing power needed in both encoding and decoding. A two-edged sword, one would think.

User Rank
re: Video: mobile chips are like pizza
junko.yoshida   8/3/2012 8:17:40 PM
Thanks for posting, Sylvie. But I want to make sure that Weili Dai, Marvell's co-founder, gets credit for using the "pizza" analogy for a while. More on her thinking is explained in EE Tmes' one-on-one interview with Dai earlier this year: http://confidential.eetimes.com/news-updates/4235571/Marvell-s-Weili-Dai-bets-on-Kinoma-for-TV--mobile-strategies

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.

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
Like Us on Facebook
Special Video Section
The LTC®6363 is a low power, low noise, fully differential ...
Vincent Ching, applications engineer at Avago Technologies, ...
The LT®6375 is a unity-gain difference amplifier which ...
The LTC®4015 is a complete synchronous buck controller/ ...
The LTC®2983 measures a wide variety of temperature sensors ...
The LTC®3886 is a dual PolyPhase DC/DC synchronous ...
The LTC®2348-18 is an 18-bit, low noise 8-channel ...
The LT®3042 is a high performance low dropout linear ...
Chwan-Jye Foo (C.J Foo), product marketing manager for ...
The LT®3752/LT3752-1 are current mode PWM controllers ...
LED lighting is an important feature in today’s and future ...
Active balancing of series connected battery stacks exists ...
After a four-year absence, Infineon returns to Mobile World ...
A laptop’s 65-watt adapter can be made 6 times smaller and ...
An industry network should have device and data security at ...
The LTC2975 is a four-channel PMBus Power System Manager ...
In this video, a new high speed CMOS output comparator ...
The LT8640 is a 42V, 5A synchronous step-down regulator ...
The LTC2000 high-speed DAC has low noise and excellent ...
How do you protect the load and ensure output continues to ...