MPI_TCP_SAFEGATHER

Allows use of a congestion-avoidance algorithm for MPI_Gather() and MPI_Gatherv() over TCP. By default, MPI_TCP_SAFEGATHER is set to 1, which means use of this algorithm is on. If you know that your underlying network can handle gathering large amounts of data on a single node, you may want to override this algorithm by setting MPI_TCP_SAFEGATHER to 0.