Helen Karatza

Aristotle University of Thessaloniki - Greece

Keynote presentation on Friday, Oct.11

Scheduling Real-time Jobs in the Cloud – Research Trends and Challenges


For several years now, cloud computing has been a dominant computing paradigm. It offers computing resources to scientists, consumers and enterprises as utilities, on a pay-as-you-go basis. In particular cloud computing provides to end users a cost-effective infrastructure for running computationally intensive applications.
With the advent of cloud computing many new challenges have appeared which led to changes on traditional computing. However, there are several issues that must be addressed, in order to exploit cloud computing full potential. Thereby, significant research is carried out in cloud computing which spans many areas such as effective resource allocation, scheduling, availability, cost, reliability, quality of service, energy conservation, virtualization, networking. The scheduling algorithms play an important role in cloud computing and must provide a good performance to leasing cost ratio as well as QoS.
Particularly important in cloud computing is the effective scheduling of real-time jobs, considering not only the processing times but also the cost of the energy consumption. Therefore, energy efficient scheduling strategies are required while meeting deadlines.
A new computing paradigm which appeared recently is fog computing. This is due to the increasing number of Internet of Things applications which have time constraints. Real-time applications should be assigned to resources in both the fog and cloud layers in a way which takes into account the communication and computational characteristics of each individual application.
In this talk we will survey recent advances in cloud computing covering various concepts on real-time complex jobs scheduling and we will provide research trends and challenges in the cloud computing research field.


Helen Karatza is a Professor Emeritus in the Department of Informatics at the Aristotle University of Thessaloniki, Greece, where she teaches courses in the postgraduate and undergraduate level, and supervises doctoral and postdoctoral research. Dr. Karatza’s research interests include Computer Systems Modeling and Simulation, Performance Evaluation, Grid and Cloud Computing, Energy Efficiency in Large Scale Distributed Systems, Resource Allocation and Scheduling and Real-time Distributed Systems.
Dr. Karatza has authored or co-authored over 220 technical papers and book chapters including five papers that earned best paper awards at international conferences. She is senior member of IEEE, ACM and SCS, and she served as an elected member of the Board of Directors at Large of the Society for Modeling and Simulation International. She served as Chair and Keynote Speaker in International Conferences.
Dr. Karatza is the Editor-in-Chief of the Elsevier Journal “Simulation Modeling Practice and Theory” and Senior Associate Editor of the “Journal of Systems and Software” of Elsevier. She was Editor-in-Chief of “Simulation Transactions of The Society for Modeling and Simulation International” and Associate Editor of “ACM Transactions on Modeling and Computer Simulation”. She served as Guest Editor of Special Issues in International Journals. More info about her activities/publications can be found in here