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SUMMARY:Sirius: A Flat Datacenter Network with Nanosecond Optical Switchin
 g - Hitesh Ballani\, MSR
DTSTART:20200820T140000Z
DTEND:20200820T150000Z
UID:TALK150478@talks.cam.ac.uk
CONTACT:Srinivasan Keshav
DESCRIPTION:The increasing gap between the growth of datacenter traffic an
 d electrical switch capacity is expected to worsen due to the slowdown of 
 Moore’s law\, motivating the need for a new switching technology for the
  post-Moore’s law era. We have been developing Sirius\, an optically-swi
 tched network for datacenters providing the abstraction of a single\, high
 -radix switch that can connect thousands of nodes—racks or servers—in 
 a datacenter while achieving nanosecond-granularity reconfiguration. At it
 s core\, Sirius uses a combination of tunable lasers and simple\, passive 
 gratings that route light based on its wavelength. In this talk\, I will d
 escribe how Sirius’ switching technology and topology is tightly codesig
 ned with its routing and scheduling and with novel congestion-control and 
 time-synchronization mechanisms to achieve a scalable yet flat network tha
 t can offer high bandwidth and very low end-to-end latency. Our small-scal
 e Sirius prototype\, using a custom tunable laser chip that can tune in le
 ss than a nanosecond\, demonstrates end-to-end optical switching in 3.84ns
 .\n\nBio: Hitesh Ballani is a Senior Principal Researcher at Microsoft Res
 earch in Cambridge\, UK. His research aims to build systems and networks f
 or next-generation data centers. His current focus is on developing optica
 l technologies for the cloud. Previously\, he worked on a Quality-of-Servi
 ce architecture for networked storage that ships in Windows Server. He gra
 duated with a PhD in Computer Science from Cornell University in 2009 and 
 then joined Microsoft.
LOCATION:https://meet.google.com/ehj-dwaz-rea
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