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sometimes the output from different CPUs is mixed up.

The timing output should be in order, but sometime it is not even so we are using a right to left blocking com:

void show(const MPI_Comm inComm) const {
        int myRank, nbProcess;
        int retMpi = MPI_Comm_rank( inComm, &myRank);
        assert(retMpi == MPI_SUCCESS);
        retMpi = MPI_Comm_size( inComm, &nbProcess);
        assert(retMpi == MPI_SUCCESS);

        if((&outputStream == &std::cout || &outputStream == &std::clog) && myrank != nbProcess-1){
            // Print in reverse order
            char tmp;
            MPI_Recv(&tmp, 1, MPI_BYTE, myrank+1, 99, inComm, MPI_STATUS_IGNORE);
        }

        std::stack<std::pair<int, const std::shared_ptr<CoreEvent>>> events;

        for (int idx = static_cast<int>(root->getChildren().size()) - 1; idx >= 0; --idx) {
            events.push({0, root->getChildren()[idx]});
        }

        outputStream << "[TIMING-" <<  myRank<< "] Local times.\n";
        outputStream << "[TIMING-" <<  myRank<< "] :" << root->getName() << "\n";
        // output here            
        outputStream.flush();

        if((&outputStream == &std::cout || &outputStream == &std::clog) && myrank != 0){
            // Print in reverse order
            char tmp;
            MPI_Send(&tmp, 1, MPI_BYTE, myrank-1, 99, inComm);
        }
    }