I'm a member of the UART group, specialized in computer architecture. I'm currently working in the analysis of resource contention in runtime systems, within the Resource Sharing Modeling project.

Publications

• Sampled Simulation of Task-Based Programs. Thomas Grass, Trevor E. Carlson, Alejandro Rico, Germán Ceballos, Eduard Ayguade, Marc Casas, and Miquel Moreto. In IEEE Transactions on Computers, volume 68, number 2, pp 255-269, IEEE COMPUTER SOC, 2019. (DOI).
• Understanding Task Parallelism: Providing insight into scheduling, memory, and performance for CPUs and Graphics. Germán Ceballos. Ph.D. thesis, Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology nr 1737, Acta Universitatis Upsaliensis, Uppsala, 2018. (fulltext, preview image).
• Tail-PASS: Resource-based Cache Management for Tiled Graphics Rendering Hardware. Germán Ceballos, Erik Hagersten, and David Black-Schaffer. In Proc. 16th International Conference on Parallel and Distributed Processing with Applications, pp 55-63, IEEE, 2018. (DOI).
• Behind the Scenes: Memory Analysis of Graphical Workloads on Tile-based GPUs. Germán Ceballos, Andreas Sembrant, Trevor E. Carlson, and David Black-Schaffer. In Proc. International Symposium on Performance Analysis of Systems and Software: ISPASS 2018, pp 1-11, IEEE Computer Society, 2018. (DOI, fulltext:preprint).
• Analyzing performance variation of task schedulers with TaskInsight. Germán Ceballos, Thomas Grass, Andra Hugo, and David Black-Schaffer. In Parallel Computing, volume 75, pp 11-27, 2018. (DOI).
• Analyzing Graphics Workloads on Tile-based GPUs. Germán Ceballos, Andreas Sembrant, Trevor E. Carlson, and David Black-Schaffer. In Proc. 20th International Symposium on Workload Characterization, pp 108-109, IEEE, 2017. (DOI).
• Exploring scheduling effects on task performance with TaskInsight. Germán Ceballos, Andra Hugo, Erik Hagersten, and David Black-Schaffer. In Supercomputing frontiers and innovations, volume 4, number 3, pp 91-98, 2017. (DOI, Fulltext).
• Understanding the interplay between task scheduling, memory and performance. Germán Ceballos, Erik Hagersten, and David Black-Schaffer. In Proc. Companion 8th ACM International Conference on Systems, Programming, Languages, and Applications: Software for Humanity, pp 21-23, ACM Press, New York, 2017. (DOI).
• How to make tasks faster: Revealing the complex interactions of tasks in the memory system. Germán Ceballos. In Proc. Companion 8th ACM International Conference on Systems, Programming, Languages, and Applications: Software for Humanity, pp 1-3, ACM Press, New York, 2017. (DOI).
• Modeling the interactions between tasks and the memory system. Germán Ceballos. Licentiate thesis, IT licentiate theses / Uppsala University, Department of Information Technology nr 2017-002, Uppsala University, 2017. (fulltext).
• TaskInsight: Understanding task schedules effects on memory and performance. Germán Ceballos, Thomas Grass, Andra Hugo, and David Black-Schaffer. In Proc. 8th International Workshop on Programming Models and Applications for Multicores and Manycores, pp 11-20, ACM Press, New York, 2017. (DOI, Fulltext).
• Characterizing Task Scheduling Performance Based on Data Reuse. Germán Ceballos, Thomas Grass, David Black-Schaffer, and Andra Hugo. In Proc. 9th Nordic Workshop on Multi-Core Computing, 2016. (fulltext:print).
• Formalizing data locality in task parallel applications. Germán Ceballos, Erik Hagersten, and David Black-Schaffer. In Algorithms and Architectures for Parallel Processing, volume 10049 of Lecture Notes in Computer Science, pp 43-61, Springer, 2016. (DOI).
• Spatial and Temporal Cache Sharing Analysis in Tasks. Germán Ceballos and David Black-Schaffer. In , Timisoara, Romania, 2016. (Proceedings, fulltext:print).
• StatTask: Reuse distance analysis for task-based applications. Germán Ceballos, Erik Hagersten, and David Black-Schaffer. In Proc. 7th Workshop on Rapid Simulation and Performance Evaluation: Methods and Tools, pp 1-7, ACM Press, New York, 2015. (DOI).
• Shared Resource Sensitivity in Task-Based Runtime Systems. Germán Ceballos and David Black-Schaffer. In Proc. 6th Swedish Workshop on Multi-Core Computing, Halmstad University Press, 2013. (fulltext:postprint).

• Adaptive Mesh Refinement for Large Scale Physical Simulations. Germán Ceballos, Oscar Reula and Carlos Bederián. In Proceedings of EST 2013, 42nd JAIIO. FaMAF, Universidad Nacional de Córdoba, Córdoba, Argentina. Sep 2013. (Conference Website, fulltext)

• MSc. Thesis:
  • A GPU-powered Parallel Adaptive Mesh Refinement Framework for Large Scale Physical Simulations (fulltext sp|en (soon)). Germán Ceballos, Oscar Reula and Carlos Bederián. FaMAF, Universidad Nacional de Córdoba, Córdoba, Argentina. March 2013.

Semester	Course code	Course	What?
Autumn 2015	1DT032	Advanced Computer Science Studies in Sweden	Lab Instructor
Autumn 2015	1DT086	Introduction to Studies in Embedded Systems	Lab Instructor
Spring 2015	1DT024	Advanced Computer Architecture	Teaching Assistant, Labs
Autumn 2014	1DT016	Computer Architecture I (Distance)	Instructor
Autumn 2014	1DT038	Computer Architecture I	Teaching Assistant, Labs
Autumn 2014	1DL560	Parallel Programming for Efficiency	Teaching Assistant, Labs
Spring 2014	1DT089	Operating Systems and Multicore Programming	Teaching Assistant, Labs
Autumn 2013	1DT016	Computer Architecture I (Distance)	Teaching Assistant, Labs
Autumn 2013	1DT038	Computer Architecture I	Teaching Assistant, Labs