You should have heard by now that OpenMP 4.5 has finally been released, you can find the official statement on openmp.org: http://openmp.org/wp/2015/11/openmp-45-specs-released/. It turned out to be more of a major release than initially anticipated, hence the OpenMP Language Committee decided to jump to version 4.5 over the originally anticipated 4.1.
At SC15, I had the opportunity to give a talk at the OpenMP booth. I decided to review the Tasking feature in OpenMP, and very briefly give an overview about all the new Tasking-related goodies that made their way into OpenMP 4.5. The video has been released on youtube and the slide are also available:
During SC14, Michael Klemm from Intel and myself teamed up to give an OpenMP 4.0 overview talk at the OpenMP booth. Our goal was to touch on all important aspects, from thread binding over tasking to accelerator support, and to entertain our audience in doing so. Although not all jokes translate from German to English as we intended, I absolutely think that the resulting video is a fun-oriented 25-minutes run-down of OpenMP 4.0 and worth sharing here:
You should have heard by now that OpenMP 4.0 has finally been released, you can find the official statement on openmp.org: http://openmp.org/wp/2013/07/openmp-40/. It really is a major new release and therefore it will take a while until all implementations have incorporated all new features. Nevertheless, as some implementers already offer beta releases of their compiler products with some new OpenMP 4.0 features available, you might be interested in learning more about the new standard to get your hands dirty. In this blog post I collected links to the OpenMP 4.0 material I am currently aware of and give pointers to places and events at which you can learn more.
End of July / early August we hold our “Parallel Programming Summer Course” at Aachen, during which OpenMP occupied two days of the agenda. The course material contains three slide decks on OpenMP which give a thorough introduction (I hope) into OpenMP Programming and touch the following new OpenMP 4.0 feature: device construct, task dependencies, thread affinity, array sections and user-defined reductions. I gave very similar talks at the Hartree Centre Summer School 2013.
Rolf Rabenseifner from HLRS also holds many very good courses on parallel programming. He is currently extending his material to cover selected OpenMP 4.0 topics, probably for the next course instance already.
If you attended ISC’13 in Leipzig, you had the chance to hear Bronis de Supinsky, Michael Klemm and myself in the half-day Advanced OpenMP Tutorial. Our slides are part of the tutorial proceedings.
At SC13 in Denver the same group plus Ruud van der Pas will talk about Advanced OpenMP: Performance and 4.0 Features, see http://sc13.supercomputing.org/content/tutorials. This will be the first time we will focus in great detail on new features of OpenMP 4.0 and how to exploit those for programmability and performance. And finally at Euro-Par 2013 together with Tim Mattson I will be giving a half-day tutorial on Advanced OpenMP again, this time even more focussing on lower-level system details like the memory model and cache coherency mechanisms.
Last week’s OpenMP Language Committee face-to-face (F2F) meeting was meant to resolve the final outstanding issues to get the OpenMP 4.0 specification ready. With this week’s concall I assume we achieved just that and now it is our editor’s turn to apply all remaining tickets to the spec document. After that, the OpenMP ARB will perform the official vote on July 11th (if my calendar is correct), which in case of a positive vote will then also be the release date of the OpenMP 4.0 spec. This voting is generally considered just a formality, as the OpenMP member companies and institutions sending staff to the Language Committee also constitute the OpenMP ARB. OpenMP 4.0 will not break existing codes.
If you are interested in learning about the new features, you may want to stop by at the JARA-HPC booth #755 at ISC in Leipzig next week. We have (preliminary) OpenMP 4.0 syntax reference cards as handouts for you. If you want to meet me in person, you are welcome to visit the booth during my booth duties on Monday (11:30h to 13:00h), Tuesday (11:30 to 13:00h) or Wednesday (13:00h to 14:30h).
Task dependency support through the new depend clause. (p91)
Initial error model support through cancel and cancellation point constructs to request cancellation of specified region types and to declare a user-defined cancellation point to check for cancellation requests. (Section 2.13, p116: Cancellation Constructs)
Support for array sections in C, C++ and Fortran. (Section 2.4, p36: Array Sections)
Extended declare simd directive to allow multiple declarations. (p64)
New environment variable OMP_DISPLAY_ENV instructing the runtime to display the OpenMP version number and ICV values during initialization. (p219)
Additional enhancements to support Fortran 2003.
As we were not yet able to incorporate all the feedback that has been reported so far, a few know issues are still in the document. Additionally, some more minor changes are already in preparation. Feedback and questions are of course still welcomed, so head over to http://openmp.org/wp/openmp-specifications/ and download the new document.