Publicado em: 31/01/2025

Palestra com o Prof. Carlos Juiz García

Palestra com o Prof. Carlos Juiz García da Universitat de les Illes Balears (Espanha) no INF-UFRGS

O Instituto de Informática da UFRGS convida a comunidade acadêmica para a palestra do Prof. Carlos Juiz García, da Universitat de les Illes Balears (Espanha).

O evento será realizado na quarta-feira, 5 de fevereiro, às 14h30, no auditório 0 do prédio 43412 (AUD 0) no Instituto de Informática, Campus do Vale.

O Prof. Carlos Juiz estará visitando o INF entre os dias 3 e 7 de fevereiro pelo programa ERASMUS da Comunidade Europeia e estará disponível para conversas e reuniões durante sua estadia.

Tema da palestra: “On the scalability of the speedup considering the overhead of consolidating virtual servers for data centers”

O tema abordado está relacionado ao artigo publicado pelos pesquisadores Carlos Juiz e B. Bermejo:
Juiz, C., & Bermejo, B. (2024). On the scalability of the speedup considering the overhead of consolidating virtual machines in servers for data centers. The Journal of Supercomputing, 1-49.

Abstract
Virtualization technologies are extensively utilized in data centers, particularly cloud computing. This facilitates data center management and diminishes the number of physical machines (servers) and, subsequently, their cooling requirements, leading to cost, space, and power consumption reductions. When applications in data centers are executing independent parallel transactions, but with similar performance requirements, the appropriate level of virtual machine consolidation on a server poses a fundamental challenge for capacity planning. This article introduces a method to evaluate the performance speedup achieved through virtualization on any server and the effects of virtualization and consolidation overheads on physical or virtual machine scalability. This research formalizes the speedup and overheads, using classical computer architecture statements. but at the same time proposes a new method to analyze these overhead amounts and types, showing the scalability and efficiency of different consolidations in the same server and its comparison against no consolidation. This work also proposes a new way to determine the optimal number of physical servers and the optimal number of consolidated virtual machines for a given transaction workload. The real experimentation was performed with different workload sizes, types of virtualizations and different servers. The method presented also facilitates the representation of linear scalability against the real degree of parallelism of either physical machines or consolidated virtual machines for a given transaction workload, as well as striking the right balance between speedup and energy in virtual server consolidation.

Brief CV
Professor Carlos Juiz received his PhD degree in Informatics from the University of the Balearic Islands (UIB), Spain. He has got a postgraduate degree on Office automation Management from the Polytechnic University of Madrid, Spain. Before joining the Department of Computer Science at UIB, he had several positions related to the computer systems industry. From 1990 he was Systems Analyst in Xerox, leaving this position as Senior Analyst in 1999. He was visiting researcher at Department for Computer Science and Business Informatics, University of Vienna, in 2003 and Visiting Associate Professor at Biomedical Informatics Research, in 2011, at Stanford University. Carlos Juiz is heading the ACSIC research group (http://acsic.uib.es) and his research interest mainly focuses on performance engineering, Green IT and IT governance.He has been involved in 50 regional, national, European and international research projects, including cooperation projects mainly with Universities of Paraguay, Albania, Tunisia, Morocco and Ecuador. He has participated in more than 500 international conferences, workshops and congresses as reviewer, session chair, president of the program committee but mostly as programme committee member or scientific committee member. He is co-author of more than 200 international papers (including journals, published reviews, proceedings and book chapters) and two university textbooks. Carlos Juiz has given about 50 international seminars and invited to conferences at numerous prestigious universities in the world.Carlos Juiz is senior member of the IEEE and also senior member of the ACM. He has also been appointed as a member of the Domain Committee on Cloud Computing from IFIP until 2017.He was the Sub-director of the Polytechnic School (2004-2005) and Director of the Office of Planning and Prospective at the University of the Balearic Islands (2005-2007). He was the President’s Delegate of New Technologies (2007-2011) and Vice-rector for Information Technologies (2011-2013) at UIB. Carlos Juiz was the Director of the Chair from Telefónica at UIB (2012-2014). He is one executive vice-president at the TURISTEC cluster and also board member of Balears.T cluster. He is the coordinator of the workgroup of Governance of IT AENOR, the Spanish body in ISO and coeditor of the ISO/IEC 38503 standard.Currently, He is Subdirector of the Laboratory of Entrepreneurship and Social Innovation at UIB.