119 строки
4.6 KiB
C
119 строки
4.6 KiB
C
/*
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* Copyright (c) 2006 The Trustees of Indiana University and Indiana
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* University Research and Technology
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* Corporation. All rights reserved.
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* Copyright (c) 2006 The Technical University of Chemnitz. All
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* rights reserved.
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*
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* Author(s): Torsten Hoefler <htor@cs.indiana.edu>
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*
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*/
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#include "nbc_internal.h"
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/* an gatherv schedule can not be cached easily because the contents
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* ot the recvcounts array may change, so a comparison of the address
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* would not be sufficient ... we simply do not cache it */
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#ifdef HAVE_SYS_WEAK_ALIAS_PRAGMA
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#pragma weak NBC_Igatherv=PNBC_Igatherv
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#define NBC_Igatherv PNBC_Igatherv
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#endif
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int NBC_Igatherv(void* sendbuf, int sendcount, MPI_Datatype sendtype, void* recvbuf, int *recvcounts, int *displs, MPI_Datatype recvtype, int root, MPI_Comm comm, NBC_Handle* handle) {
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int rank, p, res, i;
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MPI_Aint rcvext;
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NBC_Schedule *schedule;
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char *rbuf, inplace;
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NBC_IN_PLACE(sendbuf, recvbuf, inplace);
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res = NBC_Init_handle(handle, comm);
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if(res != NBC_OK) { printf("Error in NBC_Init_handle(%i)\n", res); return res; }
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res = MPI_Comm_rank(comm, &rank);
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if (MPI_SUCCESS != res) { printf("MPI Error in MPI_Comm_rank() (%i)\n", res); return res; }
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res = MPI_Comm_size(comm, &p);
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if (MPI_SUCCESS != res) { printf("MPI Error in MPI_Comm_rank() (%i)\n", res); return res; }
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res = MPI_Type_extent(recvtype, &rcvext);
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if (MPI_SUCCESS != res) { printf("MPI Error in MPI_Type_extent() (%i)\n", res); return res; }
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schedule = (NBC_Schedule*)malloc(sizeof(NBC_Schedule));
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if (NULL == schedule) { printf("Error in malloc() (%i)\n", res); return res; }
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handle->tmpbuf=NULL;
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res = NBC_Sched_create(schedule);
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if(res != NBC_OK) { printf("Error in NBC_Sched_create (%i)\n", res); return res; }
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/* send to root */
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if(rank != root) {
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/* send msg to root */
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res = NBC_Sched_send(sendbuf, false, sendcount, sendtype, root, schedule);
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if (NBC_OK != res) { printf("Error in NBC_Sched_send() (%i)\n", res); return res; }
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} else {
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for(i=0;i<p;i++) {
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rbuf = ((char *)recvbuf) + (displs[i]*rcvext);
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if(i == root) {
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if(!inplace) {
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/* if I am the root - just copy the message */
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res = NBC_Copy(sendbuf, sendcount, sendtype, rbuf, recvcounts[i], recvtype, comm);
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if (NBC_OK != res) { printf("Error in NBC_Copy() (%i)\n", res); return res; }
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}
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} else {
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/* root receives message to the right buffer */
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res = NBC_Sched_recv(rbuf, false, recvcounts[i], recvtype, i, schedule);
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if (NBC_OK != res) { printf("Error in NBC_Sched_recv() (%i)\n", res); return res; }
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}
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}
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}
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res = NBC_Sched_commit(schedule);
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if (NBC_OK != res) { printf("Error in NBC_Sched_commit() (%i)\n", res); return res; }
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res = NBC_Start(handle, schedule);
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if (NBC_OK != res) { printf("Error in NBC_Start() (%i)\n", res); return res; }
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return NBC_OK;
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}
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Fortran bindings */
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#ifdef HAVE_SYS_WEAK_ALIAS_PRAGMA
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NBC_F77_ALLFUNC_(nbc_igatherv,NBC_IGATHERV,(void *sendbuf, int *sendcount, int *sendtype, void *recvbuf, int *recvcounts, int *displs, int *recvtype, int *root, int *fcomm,
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int *fhandle, int *ierr));
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#pragma weak NBC_IGATHERV = nbc_igatherv_f
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#pragma weak nbc_igatherv = nbc_igatherv_f
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#pragma weak nbc_igatherv_ = nbc_igatherv_f
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#pragma weak nbc_igatherv__ = nbc_igatherv_f
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#pragma weak PNBC_IGATHERV = nbc_igatherv_f
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#pragma weak pnbc_igatherv = nbc_igatherv_f
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#pragma weak pnbc_igatherv_ = nbc_igatherv_f
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#pragma weak pnbc_igatherv__ = nbc_igatherv_f
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void nbc_igatherv_f(void *sendbuf, int *sendcount, int *sendtype, void *recvbuf, int *recvcounts, int *displs, int *recvtype, int *root, int *fcomm,
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int *fhandle, int *ierr) {
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#else
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void NBC_F77_FUNC_(nbc_igatherv,NBC_IGATHERV)(void *sendbuf, int *sendcount, int *sendtype, void *recvbuf, int *recvcounts, int *displs, int *recvtype, int *root, int *fcomm,
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int *fhandle, int *ierr);
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void NBC_F77_FUNC_(nbc_igatherv,NBC_IGATHERV)(void *sendbuf, int *sendcount, int *sendtype, void *recvbuf, int *recvcounts, int *displs, int *recvtype, int *root, int *fcomm,
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int *fhandle, int *ierr) {
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#endif
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MPI_Datatype rtype, stype;
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MPI_Comm comm;
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NBC_Handle *handle;
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/* this is the only MPI-2 we need :-( */
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rtype = MPI_Type_f2c(*recvtype);
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stype = MPI_Type_f2c(*sendtype);
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comm = MPI_Comm_f2c(*fcomm);
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/* create a new handle in handle table */
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NBC_Create_fortran_handle(fhandle, &handle);
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/* call NBC function */
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*ierr = NBC_Igatherv(sendbuf, *sendcount, stype, recvbuf, recvcounts, displs, rtype, *root, comm, handle);
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}
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#ifdef __cplusplus
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}
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#endif
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