parallel/getBlocksOfEntitiesPartition.c
/* This file is part of MED.
*
* COPYRIGHT (C) 1999 - 2021 EDF R&D, CEA/DEN
* MED is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* MED is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with MED. If not, see <http://www.gnu.org/licenses/>.
*/
#include <med.h>
#define MESGERR 1
#include "med_utils.h"
#include "getBlocksOfEntitiesPartition.h"
void getContinuousBlocksOfEntities(const int myrank, const int nproc, const int nentities,
med_size * const start, med_size * const stride, med_size * const count, med_size * blocksize,
int * const lastusedrank, med_size * const lastblocksize ) {
int _nusedproc = nproc;
int _lastusedrank = 0;
med_size _blocksize = nentities/nproc;
/* _nblocks_pproc vaut 1 ou 0 si l'on utilise pas tous les processus */
int _nblocks_pproc = 0;
/*Tant que la taille des blocks est nulle on diminue le
nombre de processus utilisé jusqu'au minimum d'un processus
*/
for (; (_blocksize < 1) && ( _nusedproc > 1 ) ; ) {
SSCRUTE("NOT USING ALL PROCESS");
--_nusedproc;
_blocksize = nentities/_nusedproc;
}
_lastusedrank = _nusedproc-1;
if ( myrank < _nusedproc)
_nblocks_pproc = 1;
else
_blocksize = 0;
/* if ( _blocksize == 0 ) { */
/* if (myrank == 0 ) { _nblocks_pproc=1;_blocksize=nentities;} */
/* _lastusedrank = 0; */
/* _nusedproc = 1; */
/* _blocksize = nentities; */ /*TODO : essayer de l'enlever maintenant : Ajouté pour symétrie des opération MPI_File, *count == 0*/
/* } else { */
/* _nblocks_pproc = 1; */
/* } */
*start = myrank*_nblocks_pproc*_blocksize;
*stride = _blocksize;
*count = _nblocks_pproc;
*lastblocksize = 0;
if ( myrank == _lastusedrank ) {
*blocksize = nentities+_blocksize*(1-_nusedproc);
} else {
*blocksize =_blocksize;
}
++(*start);
*lastusedrank=_lastusedrank;
printf("My rank %d , start %l , stride %l , blocksize %l , count %l , lastblocksize %l\n",
myrank,*start,*stride,*blocksize,*count,*lastblocksize);
return;
}
void getCyclicBlocksOfEntities(const int myrank, const int nproc, const int nentities,
med_size * const start, med_size * const stride, med_size * const io_count, med_size * blocksize,
int * const lastusedrank, med_size * const lastblocksize ) {
int _nusedproc = nproc;
int _lastusedrank = nproc-1;
int _nblocks_pproc = *io_count;
int _nblocks = _nblocks_pproc*nproc;
med_size _blocksize = 0;
if (_nblocks) _blocksize=nentities/_nblocks;
/*Tant que la taille des block est nulle on diminue le
nombre de blocks affecté par processus jusqu'au minimum
d'un block par processus
*/
for (; (_blocksize < 1) && ( _nblocks_pproc > 1 ) ; ) {
--_nblocks_pproc;
_nblocks = _nblocks_pproc*nproc;
_blocksize = nentities/_nblocks;
}
/* ISCRUTE(_nblocks_pproc); */
/* ISCRUTE(_blocksize); */
/*Si la taille des blocks est toujours nulle,
c'est qu'il y a trop de processus pour le nombre d'entités :
-> On effectue alors une répartition par block contigüs qui prend
en compte la possible non affectation de certains processus.
*/
if ( _blocksize == 0 ) {
MESSAGE("Downcasting getCyclicBlocksOfEntities to getContinuousBlocksOfEntities");
getContinuousBlocksOfEntities(myrank, nproc, nentities,
start, stride, io_count, blocksize, lastusedrank, lastblocksize );
return;
}
/* A partir d'ici on est en mesure de calculer une répartition cyclique par block*/
*blocksize = _blocksize;
*stride = _blocksize*nproc;
*start = _blocksize*myrank;
*io_count = _nblocks_pproc;
if (myrank == _lastusedrank) {
*lastblocksize = nentities + _blocksize*(1-nproc*_nblocks_pproc);
/*Dans le cas _nblocks_pproc==1 on a en fait une répartition contigüe des blocks
lastblocksize vaut alors 0 car il n'est pas utilisé.*/
if ( _nblocks_pproc == 1 ) {*blocksize=*lastblocksize;*lastblocksize=0;}
} else
*lastblocksize=0;
++(*start);
*lastusedrank=_lastusedrank;
/* printf("My rank %d, start %d, stride %d, blocksize %d, io_count %d, lastblocksize %d\n",myrank,*start,*stride,*blocksize,*io_count,*lastblocksize); */
return;
}
med_size
hsize_t med_size
Definition: med.h:329
getBlocksOfEntitiesPartition.h
MESSAGE
#define MESSAGE(chaine)
Definition: med_utils.h:324
med.h
getCyclicBlocksOfEntities
void getCyclicBlocksOfEntities(const int myrank, const int nproc, const int nentities, med_size *const start, med_size *const stride, med_size *const io_count, med_size *blocksize, int *const lastusedrank, med_size *const lastblocksize)
Definition: getBlocksOfEntitiesPartition.c:79
SSCRUTE
#define SSCRUTE(chaine)
Definition: med_utils.h:323
getContinuousBlocksOfEntities
void getContinuousBlocksOfEntities(const int myrank, const int nproc, const int nentities, med_size *const start, med_size *const stride, med_size *const count, med_size *blocksize, int *const lastusedrank, med_size *const lastblocksize)
Definition: getBlocksOfEntitiesPartition.c:27
med_utils.h