slide1 n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Thermal Sensors and Adaptivity for Power Reduction PowerPoint Presentation
Download Presentation
Thermal Sensors and Adaptivity for Power Reduction

Loading in 2 Seconds...

play fullscreen
1 / 1

Thermal Sensors and Adaptivity for Power Reduction - PowerPoint PPT Presentation


  • 82 Views
  • Uploaded on

Accessed frequently. Gate. Put in Drowsy. Line brought into cache. 35 ο C. Accessed frequently. Put in Drowsy. Gate. Line brought into cache. 85 ο C. Static Power Saved over stationary approach ~24%. Cache Line Idle. 65 ο C. 45 ο C. 35 ο C. Hybrid. 85 ο C. Drowsy. 110 ο C.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Thermal Sensors and Adaptivity for Power Reduction' - elina


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1

Accessed frequently

Gate

Put in Drowsy

Line brought into cache

35οC

Accessed frequently

Put in Drowsy

Gate

Line brought into cache

85οC

Static Power Saved over stationary approach ~24%

Cache Line Idle

65οC

45οC

35οC

Hybrid

85οC

Drowsy

110οC

Thermal Sensors and Adaptivity for Power Reduction

HiPeac Summer School 2005

APEL: Applied Electronics Laboratory

University of Patras, Patras Greece

Polychronis Xekalakis, Stefanos Kaxiras, Georgios Keramidas

xekalakis@apel.ee.upatras.gr, kaxiras,keramidas@ee.upatras.gr

Key Ideas

Use 4T Dram Cells as Thermal Sensors

Adapt Hybrid Decay-Drowsy Scheme in Accordance to Temperature

3. Thermally Adaptive Hybrid Drowsy-Decay Scheme

1. 4T Dram Decay Sensors

How it Works

A day of a Cache Line in a Hybrid Thermally Adaptive Scheme

  • Initially 4T Cell is Charged
  • When it loses it’s charge generates a pulse and resets charge of the cell
  • Rate at which loses charge proportional to leakage currents
  • Leakage currents proportional to temperature
  • Frequency of pulses proportional to temperature
  • Cache Line brought into cache and frequently accessed
  • Cache Line Idle:
  • Put line in Drowsy state
  • Gate the cache line
  • Drowsy kept Constant with temperature (little variation)
  • Decay varies with Temperature (use 4T cell)

Sensors Characteristic

Effect of Process Variation

Stationary Hybrid and Drowsy Normalized Energy Savings vs. Temperature

The Mechanics

2. Leakage Techniques that Adapt to Temperature

Why we Need Them

  • Gate Leakage exponentially depends on Temperature
  • Temperature Changes with program execution
  • All leakage saving techniques try to minimize dynamic to static ratio
  • Stationary approach sub-optimal and this worsens as technology scales
  • Gate Leakage is and will be dominant Leakage Current

Normalized Energy Savings vs. Temperature

Perfect Temperature Adaptivity

Ideal Hybrid

4T Hybrid

Decay

Drowsy

Hybrid

Leakage Current: Moore’s Law Meets Static Power

Nam Sung Kim, Todd Austin, David Blaauw, Trevor Mudge