So exactly which power states exist on the Intel® Xeon Phi™ coprocessor? What happens in each of the power states? Inquiring minds want to know. And since you are, no doubt, aggressively involved in high performance computing (HPC), I am sure you want to know also.
Mobile devices are everywhere today, like smartphones, tablets, UltrabookTM devices, etc. All of them are powered by batteries. Battery life time is critical to end users because everyone wants the battery to last as longer as possible.
This following article was subsidized by Intel and authored by Zebra Partners.
Often considered to be the Achille's heel of portable devices, power management has come a long way. The new breed of Ultrabook™ PCs have pushed battery life and thermal design to a new level. We spoke with Dr. Mike Pearce, Intel Community Manager for Power Efficiency.
Q: Ultrabooks already have fantastic battery life by design, why do I need to worry about it in my application?
I’m posting this as a good starting point. It’s a well written paper (in my opinion) and a very enjoyable read. (This should show you how much of a life I have.)
What is our ultimate goal? What do we want to do with our life? Is life important or just a meaningless exercise in futility? These are very important questions but generally irrelevant to this discussion.
So what is our ultimate goal here in this series of articles? We want to come up with a useful measure of power-performance for an application, such as Joules per instructions for a given app. But as we will see, finding this answer is much less clear cut than it first appears.
Performance per Watt is pretty straight forward when you first look at it. Then you begin to sink in the quicksand you’ve blithely walked into. The panic sets in as you sink lower and lower. Eventually you decide to ignore the whole complicated mess and go back to saying to yourself how straight forward it is. Of course, deep within your heart of hearts, you know that it’s not.
For most of us, performance per Watt is nothing more than how much our computer can get done on a given battery charge.