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/*
This file is part of the SC Library.
The SC Library provides support for parallel scientific applications.
Copyright (C) 2010 The University of Texas System
Additional copyright (C) 2011 individual authors
The SC Library 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 2.1 of the License, or (at your option) any later version.
The SC Library 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 the SC Library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
*/
#include <sc_allgather.h>
#include <sc_sort.h>
int
main (int argc, char **argv)
{
int mpiret;
int rank, num_procs;
int i, isizet;
int k, printed;
int *recvc, *displ;
int timing;
size_t zz;
size_t lcount, gtotal;
size_t *nmemb;
double *ldata, *gdata;
sc_MPI_Comm mpicomm;
char buffer[BUFSIZ];
mpiret = sc_MPI_Init (&argc, &argv);
SC_CHECK_MPI (mpiret);
mpicomm = sc_MPI_COMM_WORLD;
mpiret = sc_MPI_Comm_size (mpicomm, &num_procs);
SC_CHECK_MPI (mpiret);
mpiret = sc_MPI_Comm_rank (mpicomm, &rank);
SC_CHECK_MPI (mpiret);
sc_init (mpicomm, 1, 1, NULL, SC_LP_DEFAULT);
/*
Positive integer first argument: print nicely if global count < 1000
Other first argument: random local count between 8 and 23, print < 1000
No argument: random local counts between 8 and 23, no print/delay
*/
srand ((unsigned) rank << 15);
timing = 1; /* meaning we don't want to delay the program */
lcount = 8 + (size_t) (16. * rand () / (RAND_MAX + 1.0));
if (argc >= 2) {
const long stol = strtol (argv[1], NULL, 0);
if (stol > 0) {
/* overwrite local counts and activate timing and print the numbers */
lcount = (size_t) stol;
}
timing = 0; /* effectively enable staggered output */
}
/* create partition information */
SC_INFOF ("Local values %ld\n", (long) lcount);
nmemb = SC_ALLOC (size_t, num_procs);
isizet = (int) sizeof (size_t);
mpiret = sc_MPI_Allgather (&lcount, isizet, sc_MPI_BYTE,
nmemb, isizet, sc_MPI_BYTE, mpicomm);
SC_CHECK_MPI (mpiret);
gtotal = 0;
for (i = 0; i < num_procs; ++i) {
gtotal += nmemb[i];
}
/* create data and sort it */
ldata = SC_ALLOC (double, lcount);
for (zz = 0; zz < lcount; ++zz) {
ldata[zz] = -50. + (100. * rand () / (RAND_MAX + 1.0));
}
/* output result before sort */
if (!timing && gtotal < 1000) {
SC_GLOBAL_PRODUCTION ("Values before sort\n");
sleep ((unsigned) rank);
for (zz = 0; zz < lcount;) {
printed = 0;
for (k = 0; zz < lcount && k < 8; ++zz, ++k) {
printed += snprintf (buffer + printed, BUFSIZ - printed,
"%8.4g", ldata[zz]);
}
SC_STATISTICSF ("%s\n", buffer);
}
sc_MPI_Barrier (mpicomm);
sleep (1);
}
/* call parallel sort */
SC_GLOBAL_PRODUCTIONF ("Sorting %ld\n", (long) gtotal);
sc_psort (mpicomm, ldata, nmemb, sizeof (double), sc_double_compare);
/* output result */
if (!timing && gtotal < 1000) {
sc_MPI_Barrier (mpicomm);
SC_GLOBAL_PRODUCTION ("Values after sort\n");
sleep ((unsigned) rank);
for (zz = 0; zz < lcount;) {
printed = 0;
for (k = 0; zz < lcount && k < 8; ++zz, ++k) {
printed += snprintf (buffer + printed, BUFSIZ - printed,
"%8.4g", ldata[zz]);
}
SC_STATISTICSF ("%s\n", buffer);
}
sc_MPI_Barrier (mpicomm);
sleep (1);
}
/* verify result always, if the numbers are not too many */
if (gtotal < 100000) {
SC_GLOBAL_PRODUCTION ("Verifying\n");
gtotal = 0;
recvc = NULL;
displ = NULL;
gdata = NULL;
if (rank == 0) {
recvc = SC_ALLOC (int, num_procs);
displ = SC_ALLOC (int, num_procs + 1);
displ[0] = 0;
for (i = 0; i < num_procs; ++i) {
recvc[i] = (int) nmemb[i];
displ[i + 1] = displ[i] + recvc[i];
}
gtotal = (size_t) displ[num_procs];
gdata = SC_ALLOC (double, gtotal);
}
mpiret = sc_MPI_Gatherv (ldata, (int) lcount, sc_MPI_DOUBLE,
gdata, recvc, displ, sc_MPI_DOUBLE, 0, mpicomm);
SC_CHECK_MPI (mpiret);
if (rank == 0) {
for (zz = 0; zz < gtotal - 1; ++zz) {
SC_CHECK_ABORT (gdata[zz] <= gdata[zz + 1], "Parallel sort failed");
}
}
SC_FREE (gdata);
SC_FREE (displ);
SC_FREE (recvc);
}
/* clean up and exit */
SC_FREE (ldata);
SC_FREE (nmemb);
sc_finalize ();
mpiret = sc_MPI_Finalize ();
SC_CHECK_MPI (mpiret);
return 0;
}
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