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/* testIVallgather.c */
#include "../spoolesMPI.h"
#include "../../Drand.h"
#include "../../timings.h"
/*--------------------------------------------------------------------*/
int
main ( int argc, char *argv[] )
/*
-------------------------------------------------------
this program tests the IV_MPI_allgather() method
(1) each process generates the same owners[n] map
(2) each process creates a vec[n] vector
and fills its owned entries with random numbers
(3) the processes gather-all the entries of vec[]
created -- 98may20, cca
-------------------------------------------------------
*/
{
char *buffer ;
double chksum, globalsum, t1, t2 ;
Drand drand ;
int ii, length, myid, msglvl, n, nproc, rc, seed, tag ;
int *owners, *vec ;
int stats[4] ;
IV *objIV, *ownersIV ;
FILE *msgFile ;
/*
---------------------------------------------------------------
find out the identity of this process and the number of process
---------------------------------------------------------------
*/
MPI_Init(&argc, &argv) ;
MPI_Comm_rank(MPI_COMM_WORLD, &myid) ;
MPI_Comm_size(MPI_COMM_WORLD, &nproc) ;
fprintf(stdout, "\n process %d of %d, argc = %d", myid, nproc, argc) ;
fflush(stdout) ;
if ( argc != 5 ) {
fprintf(stdout,
"\n\n usage : %s msglvl msgFile n seed "
"\n msglvl -- message level"
"\n msgFile -- message file"
"\n n -- number of entries in the vector"
"\n seed -- random number seed"
"\n", argv[0]) ;
return(0) ;
}
msglvl = atoi(argv[1]) ;
if ( strcmp(argv[2], "stdout") == 0 ) {
msgFile = stdout ;
} else {
length = strlen(argv[2]) + 1 + 4 ;
buffer = CVinit(length, '\0') ;
sprintf(buffer, "%s.%d", argv[2], myid) ;
if ( (msgFile = fopen(buffer, "w")) == NULL ) {
fprintf(stderr, "\n fatal error in %s"
"\n unable to open file %s\n",
argv[0], argv[2]) ;
return(-1) ;
}
CVfree(buffer) ;
}
n = atoi(argv[3]) ;
seed = atoi(argv[4]) ;
fprintf(msgFile,
"\n %s "
"\n msglvl -- %d"
"\n msgFile -- %s"
"\n n -- %d"
"\n seed -- %d"
"\n",
argv[0], msglvl, argv[2], n, seed) ;
fflush(msgFile) ;
/*
----------------------------
generate the ownersIV object
----------------------------
*/
MARKTIME(t1) ;
ownersIV = IV_new() ;
IV_init(ownersIV, n, NULL) ;
owners = IV_entries(ownersIV) ;
Drand_setDefaultFields(&drand) ;
Drand_setSeed(&drand, seed) ;
Drand_setUniform(&drand, 0, nproc) ;
Drand_fillIvector(&drand, n, owners) ;
MARKTIME(t2) ;
fprintf(msgFile, "\n CPU %8.3f : initialize the ownersIV object",
t2 - t1) ;
fflush(msgFile) ;
fprintf(msgFile, "\n\n ownersIV generated") ;
if ( msglvl > 2 ) {
IV_writeForHumanEye(ownersIV, msgFile) ;
} else {
IV_writeStats(ownersIV, msgFile) ;
}
fflush(msgFile) ;
/*
----------------------------------------------
set up the vec[] vector and fill owned entries
----------------------------------------------
*/
MARKTIME(t1) ;
objIV = IV_new() ;
IV_init(objIV, n, NULL) ;
vec = IV_entries(objIV) ;
IVfill(n, vec, -1) ;
Drand_setSeed(&drand, seed + myid) ;
Drand_setUniform(&drand, 0, n) ;
for ( ii = 0 ; ii < n ; ii++ ) {
if ( owners[ii] == myid ) {
vec[ii] = (int) Drand_value(&drand) ;
}
}
MARKTIME(t2) ;
fprintf(msgFile, "\n CPU %8.3f : initialize the objIV object",
t2 - t1) ;
fflush(msgFile) ;
if ( msglvl > 2 ) {
IV_writeForHumanEye(objIV, msgFile) ;
} else {
IV_writeStats(objIV, msgFile) ;
}
fflush(msgFile) ;
/*
----------------------------------------
compute the local checksum of the vector
----------------------------------------
*/
for ( ii = 0, chksum = 0.0 ; ii < n ; ii++ ) {
if ( owners[ii] == myid ) {
chksum += (ii + 1)*(vec[ii] + 1) ;
}
}
fprintf(msgFile, "\n\n local partial chksum = %12.4e", chksum) ;
fflush(msgFile) ;
/*
-----------------------
get the global checksum
-----------------------
*/
rc = MPI_Allreduce((void *) &chksum, (void *) &globalsum,
1, MPI_DOUBLE, MPI_SUM, MPI_COMM_WORLD) ;
/*
--------------------------------
execute the all-gather operation
--------------------------------
*/
tag = 47 ;
IVzero(4, stats) ;
IV_MPI_allgather(objIV, ownersIV, stats,
msglvl, msgFile, tag, MPI_COMM_WORLD) ;
if ( msglvl > 0 ) {
fprintf(msgFile, "\n\n return from IV_MPI_allgather()") ;
fprintf(msgFile, "\n\n stats") ;
IVfprintf(msgFile, 4, stats) ;
fflush(msgFile) ;
}
if ( msglvl > 2 ) {
fprintf(msgFile, "\n\n objIV") ;
IV_writeForHumanEye(objIV, msgFile) ;
fflush(msgFile) ;
}
/*
-----------------------------------------
compute the checksum of the entire vector
-----------------------------------------
*/
for ( ii = 0, chksum = 0.0 ; ii < n ; ii++ ) {
chksum += (ii + 1)*(vec[ii] + 1) ;
}
fprintf(msgFile,
"\n globalsum = %12.4e, chksum = %12.4e, error = %12.4e",
globalsum, chksum, fabs(globalsum - chksum)) ;
fflush(msgFile) ;
/*
----------------
free the objects
----------------
*/
IV_free(ownersIV) ;
IV_free(objIV) ;
/*
------------------------
exit the MPI environment
------------------------
*/
MPI_Finalize() ;
fprintf(msgFile, "\n") ;
fclose(msgFile) ;
return(0) ; }
/*--------------------------------------------------------------------*/
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