libsc  1.6.0
src/sc_reduce.h
00001 /*
00002   This file is part of the SC Library.
00003   The SC Library provides support for parallel scientific applications.
00004 
00005   Copyright (C) 2010 The University of Texas System
00006 
00007   The SC Library is free software; you can redistribute it and/or
00008   modify it under the terms of the GNU Lesser General Public
00009   License as published by the Free Software Foundation; either
00010   version 2.1 of the License, or (at your option) any later version.
00011 
00012   The SC Library is distributed in the hope that it will be useful,
00013   but WITHOUT ANY WARRANTY; without even the implied warranty of
00014   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015   Lesser General Public License for more details.
00016 
00017   You should have received a copy of the GNU Lesser General Public
00018   License along with the SC Library; if not, write to the Free Software
00019   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
00020   02110-1301, USA.
00021 */
00022 
00023 #ifndef SC_REDUCE_H
00024 #define SC_REDUCE_H
00025 
00026 #include <sc.h>
00027 
00028 /* highest level that uses all-to-all instead of recursion */
00029 #ifndef SC_REDUCE_ALLTOALL_LEVEL
00030 #define SC_REDUCE_ALLTOALL_LEVEL        3
00031 #endif
00032 
00033 SC_EXTERN_C_BEGIN;
00034 
00035 typedef void        (*sc_reduce_t) (void *sendbuf, void *recvbuf,
00036                                     int sendcount, sc_MPI_Datatype sendtype);
00037 
00040 int                 sc_allreduce_custom (void *sendbuf, void *recvbuf,
00041                                          int sendcount,
00042                                          sc_MPI_Datatype sendtype,
00043                                          sc_reduce_t reduce_fn,
00044                                          sc_MPI_Comm mpicomm);
00045 
00049 int                 sc_reduce_custom (void *sendbuf, void *recvbuf,
00050                                       int sendcount, sc_MPI_Datatype sendtype,
00051                                       sc_reduce_t reduce_fn,
00052                                       int target, sc_MPI_Comm mpicomm);
00053 
00056 int                 sc_allreduce (void *sendbuf, void *recvbuf, int sendcount,
00057                                   sc_MPI_Datatype sendtype,
00058                                   sc_MPI_Op operation, sc_MPI_Comm mpicomm);
00059 
00063 int                 sc_reduce (void *sendbuf, void *recvbuf, int sendcount,
00064                                sc_MPI_Datatype sendtype, sc_MPI_Op operation,
00065                                int target, sc_MPI_Comm mpicomm);
00066 
00067 SC_EXTERN_C_END;
00068 
00069 #endif /* !SC_REDUCE_H */
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