Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.687999
Title: Efficient and portable multi-tasking for heterogeneous systems
Author: Margiolas, Christos
ISNI:       0000 0004 5916 2880
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 2015
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Abstract:
Modern computing systems comprise heterogeneous designs which combine multiple and diverse architectures on a single system. These designs provide potentials for high performance under reduced power requirements but require advanced resource management and workload scheduling across the available processors. Programmability frameworks, such as OpenCL and CUDA, enable resource management and workload scheduling on heterogeneous systems. These frameworks fully assign the control of resource allocation and scheduling to the application. This design sufficiently serves the needs of dedicated application systems but introduces significant challenges for multi-tasking environments where multiple users and applications compete for access to system resources. This thesis considers these challenges and presents three major contributions that enable efficient multi-tasking on heterogeneous systems. The presented contributions are compatible with existing systems, remain portable across vendors and do not require application changes or recompilation. The first contribution of this thesis is an optimization technique that reduces host-device communication overhead for OpenCL applications. It does this without modification or recompilation of the application source code and is portable across platforms. This work enables efficiency and performance improvements for diverse application workloads found on multi-tasking systems. The second contribution is the design and implementation of a secure, user-space virtualization layer that integrates the accelerator resources of a system with the standard multi-tasking and user-space virtualization facilities of the commodity Linux OS. It enables fine-grained sharing of mixed-vendor accelerator resources and targets heterogeneous systems found in data center nodes and requires no modification to the OS, OpenCL or application. Lastly, the third contribution is a technique and software infrastructure that enable resource sharing control on accelerators, while supporting software managed scheduling on accelerators. The infrastructure remains transparent to existing systems and applications and requires no modifications or recompilation. In enforces fair accelerator sharing which is required for multi-tasking purposes.
Supervisor: O'Boyle, Michael ; Dubach, Christopher Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.687999  DOI: Not available
Keywords: computer systems ; runtimes ; heterogeneous
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