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nbc_iscatter.c
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nbc_iscatter.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"
#ifdef NBC_CACHE_SCHEDULE
/* tree comparison function for schedule cache */
int NBC_Scatter_args_compare(NBC_Scatter_args *a, NBC_Scatter_args *b, void *param) {
if( (a->sendbuf == b->sendbuf) &&
(a->sendcount == b->sendcount) &&
(a->sendtype == b->sendtype) &&
(a->recvbuf == b->recvbuf) &&
(a->recvcount == b->recvcount) &&
(a->recvtype == b->recvtype) &&
(a->root == b->root) ) {
return 0;
}
if( a->sendbuf < b->sendbuf ) {
return -1;
}
return +1;
}
#endif
/* simple linear MPI_Iscatter */
#ifdef HAVE_SYS_WEAK_ALIAS_PRAGMA
#pragma weak NBC_Iscatter=PNBC_Iscatter
#define NBC_Iscatter PNBC_Iscatter
#endif
int NBC_Iscatter(void* sendbuf, int sendcount, MPI_Datatype sendtype, void* recvbuf, int recvcount, MPI_Datatype recvtype, int root, MPI_Comm comm, NBC_Handle* handle) {
int rank, p, res, i;
MPI_Aint sndext;
NBC_Schedule *schedule;
char *sbuf, inplace;
#ifdef NBC_CACHE_SCHEDULE
NBC_Scatter_args *args, *found, search;
#endif
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; }
handle->tmpbuf=NULL;
if((rank == root) && (!inplace)) {
sbuf = ((char *)sendbuf) + (rank*sendcount*sndext);
/* if I am the root - just copy the message (not for MPI_IN_PLACE) */
res = NBC_Copy(sbuf, sendcount, sendtype, recvbuf, recvcount, recvtype, comm);
if (NBC_OK != res) { printf("Error in NBC_Copy() (%i)\n", res); return res; }
}
#ifdef NBC_CACHE_SCHEDULE
/* search schedule in communicator specific tree */
search.sendbuf=sendbuf;
search.sendcount=sendcount;
search.sendtype=sendtype;
search.recvbuf=recvbuf;
search.recvcount=recvcount;
search.recvtype=recvtype;
search.root=root;
found = (NBC_Scatter_args*)hb_tree_search((hb_tree*)handle->comminfo->NBC_Dict[NBC_SCATTER], &search);
if(found == NULL) {
#endif
schedule = (NBC_Schedule*)malloc(sizeof(NBC_Schedule));
if (NULL == schedule) { printf("Error in malloc()\n"); return res; }
res = NBC_Sched_create(schedule);
if(res != NBC_OK) { printf("Error in NBC_Sched_create (%i)\n", res); return res; }
/* receive from root */
if(rank != root) {
/* recv msg from root */
res = NBC_Sched_recv(recvbuf, false, recvcount, recvtype, root, schedule);
if (NBC_OK != res) { printf("Error in NBC_Sched_recv() (%i)\n", res); return res; }
} else {
for(i=0;i<p;i++) {
sbuf = ((char *)sendbuf) + (i*sendcount*sndext);
if(i != root) {
/* root sends the right buffer to the right receiver */
res = NBC_Sched_send(sbuf, false, sendcount, sendtype, i, 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; }
#ifdef NBC_CACHE_SCHEDULE
/* save schedule to tree */
args = (NBC_Scatter_args*)malloc(sizeof(NBC_Scatter_args));
args->sendbuf=sendbuf;
args->sendcount=sendcount;
args->sendtype=sendtype;
args->recvbuf=recvbuf;
args->recvcount=recvcount;
args->recvtype=recvtype;
args->root=root;
args->schedule=schedule;
res = hb_tree_insert ((hb_tree*)handle->comminfo->NBC_Dict[NBC_SCATTER], args, args, 0);
if(res != 0) printf("error in dict_insert() (%i)\n", res);
/* increase number of elements for A2A */
if(++handle->comminfo->NBC_Dict_size[NBC_SCATTER] > NBC_SCHED_DICT_UPPER) {
NBC_SchedCache_dictwipe((hb_tree*)handle->comminfo->NBC_Dict[NBC_SCATTER], &handle->comminfo->NBC_Dict_size[NBC_SCATTER]);
}
} else {
/* found schedule */
schedule=found->schedule;
}
#endif
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_iscatter,NBC_ISCATTER,(void *sendbuf, int *sendcount, int *sendtype, void *recvbuf, int *recvcount, int *recvtype, int *root, int *fcomm, int *fhandle, int *ierr));
#pragma weak NBC_ISCATTER = nbc_iscatter_f
#pragma weak nbc_iscatter = nbc_iscatter_f
#pragma weak nbc_iscatter_ = nbc_iscatter_f
#pragma weak nbc_iscatter__ = nbc_iscatter_f
#pragma weak PNBC_ISCATTER = nbc_iscatter_f
#pragma weak pnbc_iscatter = nbc_iscatter_f
#pragma weak pnbc_iscatter_ = nbc_iscatter_f
#pragma weak pnbc_iscatter__ = nbc_iscatter_f
void nbc_iscatter_f(void *sendbuf, int *sendcount, int *sendtype, void *recvbuf, int *recvcount, int *recvtype, int *root, int *fcomm, int *fhandle, int *ierr) {
#else
void NBC_F77_FUNC_(nbc_iscatter,NBC_ISCATTER)(void *sendbuf, int *sendcount, int *sendtype, void *recvbuf, int *recvcount, int *recvtype, int *root, int *fcomm, int *fhandle, int *ierr);
void NBC_F77_FUNC_(nbc_iscatter,NBC_ISCATTER)(void *sendbuf, int *sendcount, int *sendtype, void *recvbuf, int *recvcount, int *recvtype, int *root, int *fcomm, int *fhandle, int *ierr) {
#endif
MPI_Datatype stype, rtype;
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_Iscatter(sendbuf, *sendcount, stype, recvbuf, *recvcount, rtype, *root, comm, handle);
}
#ifdef __cplusplus
}
#endif