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Postby Prasanth » Tue Jul 16, 2013 6:35 pm


The GreenDroid mobile application processor is a 45-nm multicore research prototype that targets the Android mobile-phone software stack and can execute general-purpose mobile programs with 11 times less energy than today’s most energy-efficient designs, at similar or better performance levels. It does this through the use of a hundred or so automatically generated, highly specialized, energy-reducing cores, called conservation cores. Our research attacks a key technological problem for microprocessor architects, which we call the utilization wall. 1 The utilization wall says that, with each process generation, the percentage of transistors that a chip design can switch at full frequency drops exponentially because of power constraints. A direct consequence of this is dark silicon—large swaths of a chip’s silicon area that must remain mostly passive to stay within the chip’s power budget. Currently, only about 1 percent of a modest-sized 32-nm mobile chip can switch at full frequency within a 3-W power budget. With each process generation, dark silicon gets exponentially cheaper, whereas the power budget is becoming exponentially more valuable. Our research leverages two key insights. First, it makes sense to find architectural techniques that trade this cheap resource, dark silicon, for the more valuable resource, energy efficiency. Second, specialized logic can attain 10x to 1000x better energy efficiency over general-purpose processors. Our approach is to fill a chip’s dark silicon area with specialized cores to save energy on common applications. These cores are automatically generated from the code base that the processor is intended to run—that is, the Android mobile-phone software stack. The cores feature a focused reconfigurability so that they can remain useful even as the code they target evolves.

The Utilization Wall

Although Moore’s law continues to offer exponential increases in transistor count— especially with the promise of 3D integration—CMOS scaling has broken down. We refer to CMOS scaling as the scaling of transistor properties as set down by Dennard in his 1974 paper.2 It is this breakdown of CMOS scaling that led to the industrial shift from single-threaded to multicore processors around 2005. (The ‘‘Understanding the Origins of the Utilization Wall’’ sidebar explains this breakdown in greater detail.) Although a fixed-size chip’s computing capabilities continue to increase exponentially at 2.8. The utilization wall problem is already apparent indirectly through the product lines of major processor manufacturers. Processor frequencies haven’t increased for almost half a decade, and the number of cores on a chip hasn’t been scaling at the same rate as the increase in the number of transistors. An increasing percentage of each chip is being dedicated to cache or lowactivity logic such as memory controllers and portions of the processor’s chipset. Recently, Intel’s Nehalem architecture has featured a Turbo Boost mode that runs some cores faster if the others are switched off. All of these observations show that the utilization wall is strongly shaping the evolution of processor designs. CMOS scaling theory indicates that things are going to get exponentially worse. Future architectures that try to maximize the benefit due to new process generations will need to be consciously designed to leverage many, many transistors, in a way that uses only a tiny fraction of them at a time. GreenDroid’s conservation cores have these exact properties and can be used to relax the utilization wall’s extreme power constraints.

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Re: Greendroid

Postby jemyjoy » Mon Feb 24, 2014 6:29 am

please send me the ppt on greendroid
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Re: Greendroid

Postby Megha93 » Thu Feb 27, 2014 4:41 am

Hi, this s Megha.. i hav chosen GRENDROID as my technical seminar topic.. but i m facing quite difficulty in understanding the IEEE paper on it.. I hav seen ur post abt greendroid on seminarsonly site and i found it bit easy to understand.. so cn u plz mail me the pdf , seminar report and any ppt if available to me.. my seminar is on Saturday..will u pl help me regarding this.. my id s
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Re: Greendroid

Postby ektapawar » Wed Mar 05, 2014 5:08 pm

hi...dis is ekta...plz send me seminar report n pptbof greendroid...
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Re: Greendroid

Postby milanjajoo » Fri Mar 21, 2014 12:09 pm

plz send me ppt or report on Greendroid.............
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Re: Greendroid

Postby tamruthat » Sat Mar 22, 2014 6:25 pm amrutha please send ppt nd report on greendroid.
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Joined: Sat Mar 22, 2014 6:06 pm

Re: Greendroid

Postby ravi144 » Fri Mar 28, 2014 1:47 pm

Hi, this s ravirj.. i hav chosen GRENDROID as my technical seminar topic.. but i m facing quite difficulty in understanding the IEEE paper on it.. I hav seen ur post abt greendroid on seminarsonly site and i found it bit easy to understand.. so cn u plz mail me the pdf , seminar report and any ppt if available to me.. my seminar is on tuesday..will u pl help me regarding this..
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Re: Greendroid

Postby bansalsurbhi » Wed Apr 02, 2014 1:59 pm

pls send me the ppt and pdf on greendroid i have select this topic for my seminar..
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Re: Greendroid

Postby Gautham9gowda » Thu Apr 03, 2014 1:29 pm

hi...dis is Gautham ...plz send me seminar report n
ppt of greendroid...send it to my mail id
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Re: Greendroid

Postby tasneemkhanum » Sun Apr 20, 2014 12:53 pm

please send me ppt and report of greendroid
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