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nbc_iallgatherv.c
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nbc_iallgatherv.c
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/*
* Copyright (c) 2006 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2006 The Technical University of Chemnitz. All
* rights reserved.
*
* Author(s): Torsten Hoefler <htor@cs.indiana.edu>
*
*/
#include "nbc_internal.h"
/* an allgatherv schedule can not be cached easily because the contents
* ot the recvcounts array may change, so a comparison of the address
* would not be sufficient ... we simply do not cache it */
#ifdef HAVE_SYS_WEAK_ALIAS_PRAGMA
#pragma weak NBC_Iallgatherv=PNBC_Iallgatherv
#define NBC_Iallgatherv PNBC_Iallgatherv
#endif
/* simple linear MPI_Iallgatherv
* the algorithm uses p-1 rounds
* first round:
* each node sends to it's left node (rank+1)%p sendcount elements
* each node begins with it's right node (rank-11)%p and receives from it recvcounts[(rank+1)%p] elements
* second round:
* each node sends to node (rank+2)%p sendcount elements
* each node receives from node (rank-2)%p recvcounts[(rank+2)%p] elements */
int NBC_Iallgatherv(void* sendbuf, int sendcount, MPI_Datatype sendtype, void* recvbuf, int *recvcounts, int *displs, MPI_Datatype recvtype, MPI_Comm comm, NBC_Handle *handle) {
int rank, p, res, r, speer, rpeer;
MPI_Aint rcvext, sndext;
NBC_Schedule *schedule;
char *rbuf, inplace;
NBC_IN_PLACE(sendbuf, recvbuf, inplace);
res = NBC_Init_handle(handle, comm);
if(res != NBC_OK) { printf("Error in NBC_Init_handle(%i)\n", res); return res; }
res = MPI_Comm_rank(comm, &rank);
if (MPI_SUCCESS != res) { printf("MPI Error in MPI_Comm_rank() (%i)\n", res); return res; }
res = MPI_Comm_size(comm, &p);
if (MPI_SUCCESS != res) { printf("MPI Error in MPI_Comm_size() (%i)\n", res); return res; }
res = MPI_Type_extent(sendtype, &sndext);
if (MPI_SUCCESS != res) { printf("MPI Error in MPI_Type_extent() (%i)\n", res); return res; }
res = MPI_Type_extent(recvtype, &rcvext);
if (MPI_SUCCESS != res) { printf("MPI Error in MPI_Type_extent() (%i)\n", res); return res; }
schedule = (NBC_Schedule*)malloc(sizeof(NBC_Schedule));
if (NULL == schedule) { printf("Error in malloc() (%i)\n", res); return res; }
handle->tmpbuf=NULL;
res = NBC_Sched_create(schedule);
if(res != NBC_OK) { printf("Error in NBC_Sched_create, (%i)\n", res); return res; }
if(!inplace) {
/* copy my data to receive buffer */
rbuf = ((char *)recvbuf) + (displs[rank]*rcvext);
NBC_Copy(sendbuf, sendcount, sendtype, rbuf, recvcounts[rank], recvtype, comm);
if (NBC_OK != res) { printf("Error in NBC_Copy() (%i)\n", res); return res; }
}
/* do p-1 rounds */
for(r=1;r<p;r++) {
speer = (rank+r)%p;
rpeer = (rank-r+p)%p;
rbuf = ((char *)recvbuf) + (displs[rpeer]*rcvext);
res = NBC_Sched_recv(rbuf, false, recvcounts[rpeer], recvtype, rpeer, schedule);
if (NBC_OK != res) { printf("Error in NBC_Sched_recv() (%i)\n", res); return res; }
res = NBC_Sched_send(sendbuf, false, sendcount, sendtype, speer, schedule);
if (NBC_OK != res) { printf("Error in NBC_Sched_send() (%i)\n", res); return res; }
}
res = NBC_Sched_commit(schedule);
if (NBC_OK != res) { printf("Error in NBC_Sched_commit() (%i)\n", res); return res; }
res = NBC_Start(handle, schedule);
if (NBC_OK != res) { printf("Error in NBC_Start() (%i)\n", res); return res; }
return NBC_OK;
}
#ifdef __cplusplus
extern "C" {
#endif
/* Fortran bindings */
#ifdef HAVE_SYS_WEAK_ALIAS_PRAGMA
NBC_F77_ALLFUNC_(nbc_iallgatherv,NBC_IALLGATHERV,(void *sendbuf, int *sendcount, int *sendtype, void *recvbuf, int *recvcounts, int *displs, int *recvtype, int *fcomm, int *fhandle, int *ierr));
#pragma weak NBC_IALLGATHERV = nbc_iallgatherv_f
#pragma weak nbc_iallgatherv = nbc_iallgatherv_f
#pragma weak nbc_iallgatherv_ = nbc_iallgatherv_f
#pragma weak nbc_iallgatherv__ = nbc_iallgatherv_f
#pragma weak PNBC_IALLGATHERV = nbc_iallgatherv_f
#pragma weak pnbc_iallgatherv = nbc_iallgatherv_f
#pragma weak pnbc_iallgatherv_ = nbc_iallgatherv_f
#pragma weak pnbc_iallgatherv__ = nbc_iallgatherv_f
void nbc_iallgatherv_f(void *sendbuf, int *sendcount, int *sendtype, void *recvbuf, int *recvcounts, int *displs, int *recvtype, int *fcomm, int *fhandle, int *ierr) {
#else
void NBC_F77_FUNC_(nbc_iallgatherv,NBC_IALLGATHERV)(void *sendbuf, int *sendcount, int *sendtype, void *recvbuf, int *recvcounts, int *displs, int *recvtype, int *fcomm, int *fhandle, int *ierr);
void NBC_F77_FUNC_(nbc_iallgatherv,NBC_IALLGATHERV)(void *sendbuf, int *sendcount, int *sendtype, void *recvbuf, int *recvcounts, int *displs, int *recvtype, int *fcomm, int *fhandle, int *ierr) {
#endif
MPI_Datatype rtype, stype;
MPI_Comm comm;
NBC_Handle *handle;
/* this is the only MPI-2 we need :-( */
rtype = MPI_Type_f2c(*recvtype);
stype = MPI_Type_f2c(*sendtype);
comm = MPI_Comm_f2c(*fcomm);
/* create a new handle in handle table */
NBC_Create_fortran_handle(fhandle, &handle);
/* call NBC function */
*ierr = NBC_Iallgatherv(sendbuf, *sendcount, stype, recvbuf, recvcounts, displs, rtype, comm, handle);
}
#ifdef __cplusplus
}
#endif