Xavier Teruel 's publication

Approaches for Task Affinity in OpenMP

Christian Terboven, Jonas Hahnfeld, Xavier Teruel, Sergi Mateo, Alejandro Duran, Michael Klemm, Stephen L. Olivier and Bronis R. de Supinski. Approaches for Task Affinity in OpenMP. In Proceedings of IWOMP 2016. 12th International Workshop on OpenMP. (p. 102-115). Nara, JAPAN.

Facing design issues for task affinity in OpenMP. Exploring and evaluating several approaches using Nanos++ and LLVM OpenMP runtimes.


OpenMP tasking supports parallelization of irregular algorithms. Recent OpenMP specifications extended tasking to increase functionality and to support optimizations, for instance with the taskloop construct. However, task scheduling remains opaque, which leads to inconsistent performance on NUMA architectures. We assess design issues for task affinity and explore several approaches to enable it.

We evaluate these proposals with implementations in the Nanos++ and LLVM OpenMP runtimes that improve performance up to 40% and significantly reduce execution time variation.

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OpenMP F2F 2018-2

A good week in Bordeaux, France focused on closing different open topics in the specification and many of those who have been discussed during past weeks have been shaping up and they are in good condition to go through the committee’s votes.

OpenMP tasking at ISC 2018

An advanced tutorial using the tasking model of the OpenMP standard. This course includes recent addition of OpenMP 4.5, being all the lecturers part of the OpenMP language committee.


Last Face to Face meeting before the end of the project and we have report the work progress for the different work packages and several technical sessions in a one-and-a-half-day meeting in Stockholm, Sweden.

PATC (May, 2017)

The tutorial will motivate the audience on the need for portable, efficient programming models that put less pressure on program developers while still getting good performance for clusters and clusters with GPUs.

OpenMP F2F 2018-1

We have done a very good progress towards the future of the OpenMP 5.0 specification. We have discussed many issues and voted several tickets that finally have already been included in the specification (or will do in the short term).

OmpSs demos at SC 2017

Two short demos at the exhibition center showing the basic concepts of the OmpSs programming model. See you in the BSC booth (#1975).