[NRG] Notification: Did we really need all these algorithms?: A brief history... @ Mon Nov 6, 2017 11am - 12pm (NRG at BU)

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Title: Did we really need all these algorithms?: A brief history of  
autoscaling (Ahmed Ali-Eldin)
Datacenter applications are diverse, ranging from request-response  
workloads with milli/microsecond processing times, to task based workloads  
that would run for hours. To manage the performance of these applications,  
many dynamic provisioning algorithms (aka  autoscaling algorithms) have  
been proposed in the literature. Autoscaling algorithms dynamically control  
the amount of resources allocated to an application based on its workload  
aiming to improve the application’s QoS and reduce its overall running  
costs. In this talk, I will present a brief history of autoscaling, how  
autoscalers are introduced as the holy grail of elastic cloud computing,  
and how these algorithms have evolved. In most of the published work, when  
a new autoscaling algorithm is proposed, it is seldom compared to the  
state-of-the-art, and is often compared only to static provisioning using a  
predefined QoS target. In order to better understand the performance and  
the state-of-the-art of these algorithms, we re-implemented and acquired  
implementations of popular, highly cited, algorithms in the literature and  
evaluated their performance. I will discuss how, in many cases, the newly  
published — sophisticated — algorithms perform worse when compared to the  
most naive autoscaling algorithms one can think of.  I will discuss  
approaches that one can use to establish bounds and guarantees on the  
performance of autoscaling algorithms using stochastic control theory, and  
simple statistical modeling.

This work was done in collaboration with Lund University (Sweden), TU-Delft  
(The Netherlands), and Wurzberg (Germany).

About the Speaker:
Ahmed Ali-Eldin is a postdoc at UMass, Amherst and a research scientist at  
Umea University, Sweden. He obtained his PhD in 2015. He is a Heidelberg  
Laureate Forum Alumni. His work lies somewhere in the intersection between  
building systems and building performance models trying to understand why  
(his) systems do (not) work. When he is not doing useful work, he rants  
about computer science research, benchmarks, and workloads.

When: Mon Nov 6, 2017 11am – 12pm Eastern Time
Where: Hariri Seminar Room (111 Cummington Mall, Room 180)
Calendar: NRG at BU
     * Nabeel Akhtar - creator

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