On Tue, Jan 11, 2022 at 1:52 PM Mikel Mendizabal via Gcc <gcc@gcc.gnu.org> wrote: > > Dear GCC developers, > > In the past year we started the offload of our software to GPUs. We decided > to go with OpenACC. The program we are trying to offload is Millepede2 (MP2), > a tracker alignment software used to align the CMS experiment tracker at the > large hadron collider. > > We are using gcc as our main compiler. However, we found a major > inconvenience with OpenACC 2.6, the REDUCTION clause does not accept arrays. > Thus, it not possible for us to parallelise our largest loops due to array > dependencies. We managed to offload MP2 for small datasets, we worked around > the reduction issue. Nonetheless, if our alignment campaign is large the > workarounds are not useful anymore. > > I went thought the new versions of OpenACC and I found that v2.7 accepts > arrays for the REDUCTION clause. I was wondering if it is in your plans to > include a newer version of OpenACC for the next releases.
Can you produce a self-contained example with an array for the REDUCTION clause that should be accepted with OpenACC v2.7? Thanks, Richard. > Sincerely, > Mikel Mendizabal
