Hi all, working on a tool, I'm wondering whether someone has a better solution than copying the whole array before calling the PMPI function. In the tool, we want to observe the lifetime of requests and semantically bind information to the request handle (e.g. std::map<MPI_Request, tool_info*>). When we observe completion of the request, the request handle passed by the application is already reset to MPI_REQUEST_NULL and cannot be used for the lookup. So, we need to copy the whole array of requests in order to lookup the information for the request after the PMPI call. For a call like MPI_Testany, this means to copy /count/ values to possibly use one of the values. Is there any chance to improve the situation? Would it be possible to bind the request handle to the status object for reference? It is clear that the request handle is invalid at that moment, but could still be used for some lookup. Alternatively, it would help to bind an info(?) object to the request handle, which moves to the status on completion. Best Joachim -- Dipl.-Inf. Joachim Protze IT Center Group: High Performance Computing Division: Computational Science and Engineering RWTH Aachen University Seffenter Weg 23 D 52074 Aachen (Germany) Tel: +49 241 80- 24765 Fax: +49 241 80-624765 [email protected] www.itc.rwth-aachen.de