mpi: perform reduction only over contributing nodes
- added a long to describe a redux_map of contributing nodes
- added a test program to assess the behaviour
fixes #3 (closed)
Edited by THIBAULT Samuel
[A venir] Mise en place de quotas sur nos instances GitLab. Plus d'information sur : https://doc-si.inria.fr/pages/viewpage.action?pageId=129728565
[Coming soon] Quotas installation on our GitLab instances. More information: https://doc-si.inria.fr/pages/viewpage.action?pageId=129728565
fixes #3 (closed)