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In irregular.cpp use simpler and slightly faster MPI_Reduce_scatter_block()

This commit is contained in:
Tim Mattox 2017-03-17 02:55:41 -04:00
parent 411c069ba6
commit 8e75616c14
1 changed files with 2 additions and 6 deletions
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8
src/irregular.cpp
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@ -297,11 +297,9 @@ int Irregular::create_atom(int n, int *sizes, int *proclist, int sortflag)
// setup for collective comm
// work1 = 1 for procs I send a message to, not including self
// work2 = 1 for all procs, used for ReduceScatter
for (i = 0; i < nprocs; i++) {
work1[i] = 0;
work2[i] = 1;
}
for (i = 0; i < n; i++) work1[proclist[i]] = 1;
work1[me] = 0;
@ -318,7 +316,7 @@ int Irregular::create_atom(int n, int *sizes, int *proclist, int sortflag)
MPI_Allreduce(work1,work2,nprocs,MPI_INT,MPI_SUM,world);
nrecv_proc = work2[me];
#else
MPI_Reduce_scatter(work1,&nrecv_proc,work2,MPI_INT,MPI_SUM,world);
MPI_Reduce_scatter_block(work1,&nrecv_proc,1,MPI_INT,MPI_SUM,world);
#endif
#endif
@ -545,11 +543,9 @@ int Irregular::create_data(int n, int *proclist, int sortflag)
// setup for collective comm
// work1 = 1 for procs I send a message to, not including self
// work2 = 1 for all procs, used for ReduceScatter
for (i = 0; i < nprocs; i++) {
work1[i] = 0;
work2[i] = 1;
}
for (i = 0; i < n; i++) work1[proclist[i]] = 1;
work1[me] = 0;
@ -566,7 +562,7 @@ int Irregular::create_data(int n, int *proclist, int sortflag)
MPI_Allreduce(work1,work2,nprocs,MPI_INT,MPI_SUM,world);
nrecv_proc = work2[me];
#else
MPI_Reduce_scatter(work1,&nrecv_proc,work2,MPI_INT,MPI_SUM,world);
MPI_Reduce_scatter_block(work1,&nrecv_proc,1,MPI_INT,MPI_SUM,world);
#endif
#endif