Hi all - In anticipation of a vote on the revised one-sided implementation (ticket #270), I'd like to announce the availability of an implementation of the proposed changes. The implementation is over the Portals 4 interface, and is purely one-sided. You can find the implementation at the following SVN repository: http://svn.open-mpi.org/svn/ompi/tmp-public/mpi3-onesided/ The implementation is found in ompi/mca/osc/portals4/. At this time, the implementation is mostly complete, but completely unoptimized. The only piece not implemented is support for user-defined datatypes (other than simple contiguous vectors). There are existing pure one-sided implementations which implement complex datatypes, so this is not an area of concern in terms of implementability. There is an if statement to check for complex datatypes, so the code path for simple datatypes will not get any longer when such support is added, meaning performance changes should also not be an area of concern. If you have any questions, please feel free to contact me. The implementation is still being tested and optimized, so it will be changing over time. Brian -- Brian W. Barrett Dept. 1423: Scalable System Software Sandia National Laboratories