Internet on a chip: Researchers step towards energy-efficient multicore chips

March 29, 2016 by Carnegie Mellon Electrical And Computer Engineering, Carnegie Mellon University Electrical and Computer Engineering
Internet on a chip: Researchers step towards energy-efficient multicore chips
Credit: Carnegie Mellon University Electrical and Computer Engineering

In their recent paper, Wireless NoC for VFI-enabled multicore chip design: performance evaluation and design trade-offs, researchers from Carnegie Mellon's Department of Electrical and Computer Engineering and Washington State University identify a new approach for enabling energy-efficient multicore systems. Much like bypassing road congestion when traveling long distances, by using wireless on-chip communication between individually controllable clusters, researchers were able to provide an efficient communication backbone, which can be tailored for large scale multicore systems. This paper presents a platform that is poised to save significant energy with little or no performance penalty. The article is the featured IEEE Transactions on Computers paper for the month of April.

As the number of cores packed into a single chip rises, scalable power management strategies are needed to keep power under prescribed limits. Voltage frequency islands, or VFIs, have long been used to enable such strategies. In VFI-based designs, the system is partitioned into islands with individually adjustable voltage and frequencies so as to reduce the power within allowable performance penalties.

However, while enabling significant power savings, a main challenge of VFI-based designs is the on-chip communication cost which negatively impacts application performance. Indeed, mixed voltage/frequency interfaces must be used for inter-VFI communication, thereby increasing communication delay.

This paper presents two innovative solutions, the first of which is through the VFI clustering methodology. A hybrid VFI clustering that combines both per-VFI utilization and inter-VFI communication enables minimal inter-VFI communication without greatly increasing the inter-cluster utilization variation. Secondly, researchers utilized a small-world Network on Chip or mSWNoC to enable fast and energy efficient on-chip communication. The mSWNoC exploits small-world connectivity for reducing communication costs through wireless long-range short cuts between VFIs.

Credit: Carnegie Mellon University Electrical and Computer Engineering

The wireless small-world connectivity is able to mitigate most of the penalties introduced by VFIs. Furthermore, VFI-based multicore systems with mSWNoC are shown to be significantly better in energy efficiency compared to classic systems using wired on-chip networks (e.g. mSWNoC improves the energy dissipation by 40% and the energy-delay product by 52% compared to a wireline mesh on common PERSEC and SPLASH-2 benchmarks)

Explore further: Research could lead to dramatic energy savings at data farms

More information: Paper authors include: Ryan Gary Kim, Student Member, IEEE, Wonje Choi, Student Member, IEEE, Guangshuo Liu, Student Member, IEEE, Ehsan Mohandesi, Student Member, IEEE, Partha Pratim Pande, Senior Member, IEEE, Diana Marculescu, Fellow, IEEE, Radu Marculescu, Fellow, IEEE

Related Stories

Wirelessly supplying power to brain

February 8, 2016

Human and animal movements generate slight neural signals from their brain cells. These signals obtained using a neural interface are essential for realizing brain-machine interfaces (BMI). Such neural recording systems using ...

Recommended for you

Researchers find tweeting in cities lower than expected

February 20, 2018

Studying data from Twitter, University of Illinois researchers found that less people tweet per capita from larger cities than in smaller ones, indicating an unexpected trend that has implications in understanding urban pace ...

Augmented reality takes 3-D printing to next level

February 20, 2018

Cornell researchers are taking 3-D printing and 3-D modeling to a new level by using augmented reality (AR) to allow designers to design in physical space while a robotic arm rapidly prints the work.

What do you get when you cross an airplane with a submarine?

February 15, 2018

Researchers from North Carolina State University have developed the first unmanned, fixed-wing aircraft that is capable of traveling both through the air and under the water – transitioning repeatedly between sky and sea. ...

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.