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SUMMARY:Ecovisor: A Virtual Energy System for Carbon-Efficient Application
 s - David Irwin
DTSTART:20230210T130000Z
DTEND:20230210T140000Z
UID:TALK194962@talks.cam.ac.uk
CONTACT:Madeline Lisaius
DESCRIPTION:The growth of cloud platforms is raising significant concerns 
 about their impact on the environment. To reduce their carbon footprint\, 
 future cloud platforms will need to broadly adopt low- or zero-carbon ener
 gy sources\, such as solar or wind. A distinguishing characteristic of cle
 an energy is its unreliability. Unfortunately\, today's energy systems mas
 k this unreliability in hardware\, which prevents applications from optimi
 zing their carbon-efficiency\, i.e.\, work done per kilogram of carbon emi
 tted. To address the problem\, we design an ``ecovisor\,'' which virtualiz
 es the energy system and exposes software-defined control of it to applica
 tions. Our ecovisor enables each application to handle clean energy's unre
 liability within the software stack based on its specific requirements.  W
 e implement a small-scale ecovisor prototype that virtualizes a physical e
 nergy system capable of regulating power flow between the grid\, a solar a
 rray\, batteries\, and a cluster of microservers. We evaluate our ecovisor
 's flexibility by showing how a range of applications can exercise their v
 irtual energy system in different ways to optimize carbon-efficiency. For 
 example\, we show how using a 1kWh battery to reduce renewable energy vola
 tility decreases the running time and energy usage of an elastic Spark job
  by 4.4x by eliminating recomputation overhead due to power shortages.\n\n
 David Irwin is an Associate Professor in the Department of Electrical and 
 Computer Engineering and an Adjunct Associate Professor in the College of 
 Information and Computer Sciences at the University of Massachusetts Amher
 st.  He leads the Sustainable Computing Lab\, which focuses on designing d
 istributed software systems with an emphasis on improving efficiency and s
 ustainability. 
LOCATION:Seminar time is 1pm BST in Room FW 11\, Willam Gates Hall. Zoom l
 ink: https://cl-cam-ac-uk.zoom.us/j/4361570789?pwd=Nkl2T3ZLaTZwRm05bzRTOUU
 xY3Q4QT09&amp\;from=addon 
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