| | 1 | = MPI_Reduce = |
| | 2 | Reduces values on all processes to a single value |
| | 3 | |
| | 4 | = Synopsis = |
| | 5 | {{{ |
| | 6 | #include "mpi.h" |
| | 7 | int MPI_Reduce ( void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype, MPI_Op op, int root, MPI_Comm comm ) |
| | 8 | }}} |
| | 9 | |
| | 10 | = Input Parameters = |
| | 11 | {{{ |
| | 12 | sendbuf address of send buffer (choice) |
| | 13 | count number of elements in send buffer (integer) |
| | 14 | datatype data type of elements of send buffer (handle) |
| | 15 | op reduce operation (handle) |
| | 16 | root rank of root process (integer) |
| | 17 | comm communicator (handle) |
| | 18 | }}} |
| | 19 | |
| | 20 | = Output Parameter = |
| | 21 | {{{ |
| | 22 | recvbuf address of receive buffer (choice, significant only at root) |
| | 23 | }}} |
