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Comment: Small update for the OpenMP 3.1 branch->trunk merge, add testsuites/benchmark links, update todo
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This page contains information on GCC's implementation of the [[http://www.openmp.org|OpenMP]] standard and related functionality like the auto parallelizer ({{{-ftree-parallelize-loops}}}). This page contains information on GCC's implementation of the [[http://openmp.org/wp/|OpenMP]] standard and related functionality like the auto parallelizer ({{{-ftree-parallelize-loops}}}).
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As of GCC 4.2, the compiler implements version 2.5 of the OpenMP standard.  Work is underway to implement the new version 3.0 of the standard (branch {{{gomp-3_0-branch}}}). As of GCC 4.2, the compiler implements version 2.5 of the OpenMP standard and as of 4.4 it implements version 3.0 of the OpenMP standard. The OpenMP 3.1 is supported since GCC 4.7.
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 * [[http://www.openmp.org/mp-documents/spec30_draft.pdf|OpenMP v3.0 standard (draft)]]  * [[http://www.openmp.org/mp-documents/spec30.pdf|OpenMP v3.0 standard]]
 * [[http://www.openmp.org/mp-documents/omp3.1-2011.0203a.pdf|OpenMP v3.1 draft standard]] ([[http://openmp.org/forum/viewforum.php?f=9|forum for draft comments]])
 * [[http://www.openmp.org/mp-documents/OpenMP3.1.pdf|OpenMP v3.1 standard]] (July 2011) ([[http://openmp.org/forum/viewforum.php?f=10|OpenMP 3.1 API forum]])
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= Automatic Parallelization =
({{{-ftree-parallelize-loops}}})

 * Streamization

= Test Suites and Benchmarks =

 * [[http://www.hlrs.de/organization/people/niethammer/projects/openmp-validation-suite/|OpenMP Validation Suite]] by HLRS, Univ. Stuttgart and Univ. of Houston ([[http://www2.cs.uh.edu/~openuh/download/register.shtml|Download]])
 * [[http://nanos.ac.upc.edu/content/barcelona-openmp-task-suite|OpenMP task test suite]] by BSC
 * [[http://www.spec.org/omp/|SPEC OMP]]
 * [[http://www.epcc.ed.ac.uk/software-products/epcc-openmp-benchmarks|EPCC Microbenchmarks]]
 * [[http://www.nas.nasa.gov/Resources/Software/npb.html|NAS Benchmarks]] ([[http://www.hpcs.cs.tsukuba.ac.jp/omni-openmp/download/download-benchmarks.html|unofficial C version]])
 * [[https://computation.llnl.gov/casc/RTS_Report/openmp_perf.html|LLNL benchmark]]
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 * Fix [[http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35243|PR 35423]].  * Fix [[http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35423|PR 35423]] (missing parts of OpenMP WORKSHARE).
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 * Help out with the OpenMP 3.0 implementation effort ({{{gomp-3_0-branch}}}).  * Implement `untied` tasks (no compliance issue; needs to be well tuned to be actually faster; cf. page 53 of [[https://iwomp.zih.tu-dresden.de/downloads/omp30-tasks.pdf|pdf]]) - see also next item
 * Tasks need some tuning in taskwait. Cf. [[http://gcc.gnu.org/ml/gcc/2011-04/msg00040.html|GCC email]], [[https://iwomp.zih.tu-dresden.de/downloads/runtime-olivier.pdf|comparison]]. Algorithms: [[http://www.sarc-ip.org/files/null/Workshop/1234128788173__TSchedStrat-iwomp08.pdf|PDF 1]], [[http://www.sarc-ip.org/files/xavier/Conference/1234121213301__cascon08-ibm-tasks.pdf|PDF 2]], [[http://capinfo.e.ac.upc.edu/PDFs/dir27/file003681.pdf|PDF 3]]
  Note: There is a [[SummerOfCode#Summer_of_Code_2011_Accepted_GCC_Projects|GSoC 2011 project regarding task and untied tasks]]
 * [[http://gcc.gnu.org/ml/gcc-patches/2011-08/msg00080.html|taskyield is a stub and mergeable task clonning could be optimized]]
 * OpenMP 4.0 -- when available. Cf. slides at the [[http://www.ccs.tsukuba.ac.jp/workshop/IWOMP2010/|IWOMP, the International Workshop for OpenMP]] ([[http://www.ccs.tsukuba.ac.jp/workshop/IWOMP2010/program.html|slides]] and [[http://www.ccs.tsukuba.ac.jp/workshop/IWOMP2010/tutorial.html|tutorials]]) in June 2010 and the [[http://www.springerlink.com/content/978-3-642-13216-2|OWOMP 2010 proceedings]]. There is also a [[http://www-949.ibm.com/software/rational/cafe/blogs/ccpp-parallel-multicore/2010/06/21/the-view-from-iwomp-2010-trip-report|blog entry]]. See also IWOMP 2012's [[http://www.ncsa.illinois.edu/Conferences/IWOMP11/program/program.html|talks]] and the [[http://www.ncsa.illinois.edu/Conferences/IWOMP11/program/presentations/supinski.pdf|committee report]].

OpenMP

This page contains information on GCC's implementation of the OpenMP standard and related functionality like the auto parallelizer (-ftree-parallelize-loops).

As of GCC 4.2, the compiler implements version 2.5 of the OpenMP standard and as of 4.4 it implements version 3.0 of the OpenMP standard. The OpenMP 3.1 is supported since GCC 4.7.

OpenMP Documentation

Automatic Parallelization

(-ftree-parallelize-loops)

  • Streamization

Test Suites and Benchmarks

TODO List

Feel free to add new items to this list as you run into issues or features that would be interesting to add. Send mail to the list and/or the GCC OpenMP maintainers if any item in this list sounds interesting but is hard to understand.

None: openmp (last edited 2021-11-10 07:04:00 by TobiasBurnus)