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Replaced MPI_Gatherv with MPI_Send/Recv #114

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Replaced MPI_Gatherv with MPI_Send/Recv #114

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18 changes: 15 additions & 3 deletions src/mergemesh_pmmg.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1170,10 +1170,22 @@ int PMMG_gather_parmesh( PMMG_pParMesh parmesh,

/* Gather the packed parmeshes */
ier = MG_MIN ( ier, ier_pack );
MPI_CHECK( MPI_Gatherv ( ptr,pack_size,MPI_CHAR,

// Remplacer MPI_Gatherv par une boucle Send/Recv
if (parmesh->myrank == root) {
for (int i = 0; i < nprocs; ++i) {
if (i != root) {
MPI_CHECK(MPI_Recv(rcv_buffer + displs[i], rcv_pack_size[i], MPI_CHAR, i, 0, parmesh->comm, MPI_STATUS_IGNORE), ier = 0);
}
}
} else {
MPI_CHECK(MPI_Send(ptr, pack_size, MPI_CHAR, root, 0, parmesh->comm), ier = 0);
}
/*MPI_CHECK( MPI_Gatherv ( ptr,pack_size,MPI_CHAR,
rcv_buffer,rcv_pack_size,
displs,MPI_CHAR,root,parmesh->comm ),ier=0 );

displs,MPI_CHAR,root,parmesh->comm ),ier=0 );*/


PMMG_DEL_MEM(parmesh,ptr,char,"buffer to send");

/** 4: Unpack parmeshes */
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