Technical Program of HotPower 2015
8:30--9:30

We intentionally scheduled no program in this time block so attendes can attend the opening talks of the SOSP History Day Workshop.

9:40--9:45

Opening Remarks

9:45--10:45

Keynote I

Datacenter Power Management - It's Not All Computing! (pdf)

Anand Sivasubramaniam, Penn State University

The growth of datacenters, in size and volume, has led to serious cost, scalability and environmental consequences. The computing community has made considerable advances in energy-efficient hardware and software. However, the larger set of problems cannot be solved by computing alone, and we will review these challenges in this talk. The large multi-megawatt datacenters have to resort to non-conventional low-carbon energy sources, and employ demand-response to accommodate the grid and other peak draw constraints. Micro and Mini datacenters constitute an even larger share of the global datacenter power footprint compared to their multi-megawatt cousins. Power delivery and cooling efficiencies continue to plague these infrastructures, and the challenges, in many cases, are not purely technical.

10:45--11:00

Break



11:00--12:00

Session 1: Heterogeneous Mobile Architectures (Chair: TBD)




A case for bad big.LITTLE switching: How to scale power-performance in SI-HMP (pdf)
Seehwan Yoo, Yoonseok Shim, Seunghac Lee, Sang-Ah Lee, and Joongheon Kim

Harnessing Energy Efficiency of Heterogeneous ISA Platforms (pdf)


Sharath Kumar Bhat, Ajithchandra Saya, Hemendra Kumar Rawat, Antonio Barbalace, and Binoy Ravindran
12:00--13:00

Lunch

13:00--14:00

Session 2: Datacenter & Cloud (Chair: TBD)


Modeling Communication Costs in Blade Servers (pdf)
Qiuyun Wang, and Benjamin Lee

Data layout for power efficient archival storage systems (pdf)

Ramana Reddy, Atish Kathpal, Jayanta Basak, and Randy Katz
14:00--14:15

Break

14:15--15:45

Session 3: The Verticle Stack (from Apps to Device Properties) (Chair: TBD)


Optimizing Power Consumption of Mobile Games (pdf)
Yu Yan, Songtao He, Yunxin Liu, and Longbo Huang

Sudden Drop in the Battery Level? Understanding Smartphone State of Charge Anomaly (pdf)

Mohammad Hoque and Sasu Tarkoma

How Device Properties Influence Energy-Delay Metrics and the Energy-Efficiency of Parallel Computations (pdf)

Phillip Stanley-Marbell
15:45--16:00

Break

16:00--17:00

Keynote II

Android Power Management - A Glimpse Into the Past and Present
Ashish Sharma, Google, Inc.

This talk will provide a historical perspective into the design and philosophy behind some of the power management techniques in Android. It will delve into some of the challenges faced by Project Volta team inside Google while trying to improve battery life of Android devices. It will also cover the tools, APIs, and features that have been launched with the Lollipop and the Marshmallow releases of Android, and the thinking behind them. Finally, the talk will touch upon some of the open problems and challenges in the road to a better battery life of Android devices.