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|
\chapter{{\tt testWrapperMPI.c} --- A MPI Driver Program}
\label{chapter:MPI_driver}
\begin{verbatim}
/* testWrapperMPI.c */
#include "../BridgeMPI.h"
/*--------------------------------------------------------------------*/
int
main ( int argc, char *argv[] ) {
/*
-----------------------------------------------------------
purpose -- main driver program to solve a linear system
where the matrix and rhs are read in from files and
the solution is written to a file.
NOTE: MPI version
created -- 98sep25, cca and pjs
-----------------------------------------------------------
*/
BridgeMPI *bridge ;
char *mtxFileName, *rhsFileName, *solFileName ;
double nfactorops ;
FILE *msgFile ;
InpMtx *mtxA ;
int error, msglvl, myid, neqns, nfent, nfind, nfront,
nproc, nrhs, nrow, nsolveops, permuteflag, rc, seed,
symmetryflag, type ;
int tstats[6] ;
DenseMtx *mtxX, *mtxY ;
/*--------------------------------------------------------------------*/
/*
---------------------------------------------------------------
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) ;
/*--------------------------------------------------------------------*/
/*
--------------------
get input parameters
--------------------
*/
if ( argc != 10 ) {
fprintf(stdout,
"\n\n usage : %s msglvl msgFile neqns type symmetryflag"
"\n mtxFile rhsFile solFile seed"
"\n msglvl -- message level"
"\n 0 -- no output"
"\n 1 -- timings and statistics"
"\n 2 and greater -- lots of output"
"\n msgFile -- message file"
"\n neqns -- # of equations"
"\n type -- type of entries"
"\n 1 -- real"
"\n 2 -- complex"
"\n symmetryflag -- symmetry flag"
"\n 0 -- symmetric"
"\n 1 -- hermitian"
"\n 2 -- nonsymmetric"
"\n mtxFile -- input file for A matrix InpMtx object"
"\n must be *.inpmtxf or *.inpmtxb"
"\n rhsFile -- input file for Y DenseMtx object"
"\n must be *.densemtxf or *.densemtxb"
"\n solFile -- output file for X DenseMtx object"
"\n must be none, *.densemtxf or *.densemtxb"
"\n seed -- random number seed"
"\n",
argv[0]) ;
return(0) ;
}
msglvl = atoi(argv[1]) ;
if ( strcmp(argv[2], "stdout") == 0 ) {
msgFile = stdout ;
} else {
int length = strlen(argv[2]) + 1 + 4 ;
char *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]) ;
MPI_Finalize() ;
return(0) ;
}
CVfree(buffer) ;
}
neqns = atoi(argv[3]) ;
type = atoi(argv[4]) ;
symmetryflag = atoi(argv[5]) ;
mtxFileName = argv[6] ;
rhsFileName = argv[7] ;
solFileName = argv[8] ;
seed = atoi(argv[9]) ;
fprintf(msgFile,
"\n\n %s input :"
"\n msglvl = %d"
"\n msgFile = %s"
"\n neqns = %d"
"\n type = %d"
"\n symmetryflag = %d"
"\n mtxFile = %s"
"\n rhsFile = %s"
"\n solFile = %s"
"\n",
argv[0], msglvl, argv[2], neqns, type, symmetryflag,
mtxFileName, rhsFileName, solFileName) ;
/*--------------------------------------------------------------------*/
/*
-----------------------------------
processor zero reads in the matrix.
if an error is found,
all processors exit cleanly
-----------------------------------
*/
if ( myid != 0 ) {
mtxA = NULL ;
} else {
/*
----------------------------------------------------
open the file, read in the matrix and close the file
----------------------------------------------------
*/
mtxA = InpMtx_new() ;
rc = InpMtx_readFromFile(mtxA, mtxFileName) ;
if ( rc != 1 ) {
fprintf(msgFile,
"\n fatal error reading mtxA from file %s, rc = %d",
mtxFileName, rc) ;
fflush(msgFile) ;
}
}
/*
---------------------------------------------------------------
processor 0 broadcasts the error return to the other processors
---------------------------------------------------------------
*/
MPI_Bcast((void *) &rc, 1, MPI_INT, 0, MPI_COMM_WORLD) ;
if ( rc != 1 ) {
MPI_Finalize() ;
return(-1) ;
}
/*--------------------------------------------------------------------*/
/*
---------------------------------------------------
processor zero reads in the right hand side matrix.
if an error is found, all processors exit cleanly
---------------------------------------------------
*/
if ( myid != 0 ) {
mtxY = NULL ;
} else {
/*
----------------------------------
read in the right hand side matrix
----------------------------------
*/
mtxY = DenseMtx_new() ;
rc = DenseMtx_readFromFile(mtxY, rhsFileName) ;
if ( rc != 1 ) {
fprintf(msgFile,
"\n fatal error reading mtxY from file %s, rc = %d",
rhsFileName, rc) ;
fflush(msgFile) ;
} else {
DenseMtx_dimensions(mtxY, &nrow, &nrhs) ;
}
}
/*
---------------------------------------------------------------
processor 0 broadcasts the error return to the other processors
---------------------------------------------------------------
*/
MPI_Bcast((void *) &rc, 1, MPI_INT, 0, MPI_COMM_WORLD) ;
if ( rc != 1 ) {
MPI_Finalize() ;
return(-1) ;
}
/*--------------------------------------------------------------------*/
/*
------------------------------------------
create and setup a BridgeMPI object
set the MPI, matrix and message parameters
------------------------------------------
*/
bridge = BridgeMPI_new() ;
BridgeMPI_setMPIparams(bridge, nproc, myid, MPI_COMM_WORLD) ;
BridgeMPI_setMatrixParams(bridge, neqns, type, symmetryflag) ;
BridgeMPI_setMessageInfo(bridge, msglvl, msgFile) ;
/*
-----------------
setup the problem
-----------------
*/
rc = BridgeMPI_setup(bridge, mtxA) ;
fprintf(msgFile,
"\n\n ----- SETUP -----\n"
"\n CPU %8.3f : time to construct Graph"
"\n CPU %8.3f : time to compress Graph"
"\n CPU %8.3f : time to order Graph"
"\n CPU %8.3f : time for symbolic factorization"
"\n CPU %8.3f : time to broadcast front tree"
"\n CPU %8.3f : time to broadcast symbolic factorization"
"\n CPU %8.3f : total setup time\n",
bridge->cpus[0], bridge->cpus[1], bridge->cpus[2],
bridge->cpus[3], bridge->cpus[4], bridge->cpus[5],
bridge->cpus[6]) ;
rc = BridgeMPI_factorStats(bridge, type, symmetryflag, &nfront,
&nfind, &nfent, &nsolveops, &nfactorops) ;
if ( rc != 1 ) {
fprintf(stderr,
"\n error return %d from BridgeMPI_factorStats()", rc) ;
MPI_Finalize() ;
exit(-1) ;
}
fprintf(msgFile,
"\n\n factor matrix statistics"
"\n %d fronts, %d indices, %d entries"
"\n %d solve operations, %12.4e factor operations",
nfront, nfind, nfent, nsolveops, nfactorops) ;
fflush(msgFile) ;
/*--------------------------------------------------------------------*/
/*
--------------------------------
setup the parallel factorization
--------------------------------
*/
rc = BridgeMPI_factorSetup(bridge, 0, 0.0) ;
if ( rc != 1 ) {
fprintf(stderr,
"\n error return %d from BridgeMPI_factorSetup()", rc) ;
MPI_Finalize() ;
exit(-1) ;
}
fprintf(msgFile, "\n\n ----- PARALLEL FACTOR SETUP -----\n") ;
fprintf(msgFile,
"\n CPU %8.3f : time to setup parallel factorization",
bridge->cpus[7]) ;
if ( msglvl > 0 ) {
fprintf(msgFile, "\n total factor operations = %.0f"
"\n upper bound on speedup due to load balance = %.2f",
DV_sum(bridge->cumopsDV),
DV_sum(bridge->cumopsDV)/DV_max(bridge->cumopsDV)) ;
fprintf(msgFile, "\n operations distributions over processors") ;
DV_writeForHumanEye(bridge->cumopsDV, msgFile) ;
fflush(msgFile) ;
}
/*--------------------------------------------------------------------*/
/*
------------------------------------------------------
set the factorization parameters and factor the matrix
------------------------------------------------------
*/
permuteflag = 1 ;
rc = BridgeMPI_factor(bridge, mtxA, permuteflag, &error) ;
fprintf(msgFile, "\n\n ----- FACTORIZATION -----\n") ;
if ( rc == 1 ) {
fprintf(msgFile, "\n\n factorization completed successfully\n") ;
} else {
fprintf(msgFile, "\n"
"\n return code from factorization = %d\n"
"\n error code = %d\n",
rc, error) ;
MPI_Finalize() ;
exit(-1) ;
}
fprintf(msgFile,
"\n CPU %8.3f : time to permute original matrix"
"\n CPU %8.3f : time to distribute original matrix"
"\n CPU %8.3f : time to initialize factor matrix"
"\n CPU %8.3f : time to compute factorization"
"\n CPU %8.3f : time to post-process factorization"
"\n CPU %8.3f : total factorization time\n",
bridge->cpus[8], bridge->cpus[9], bridge->cpus[10],
bridge->cpus[11], bridge->cpus[12], bridge->cpus[13]) ;
IVzero(6, tstats) ;
MPI_Reduce((void *) bridge->stats, (void *) tstats, 6, MPI_INT,
MPI_SUM, 0, bridge->comm) ;
fprintf(msgFile,
"\n\n factorization statistics"
"\n %d pivots, %d pivot tests, %d delayed vertices"
"\n %d entries in D, %d entries in L, %d entries in U",
tstats[0], tstats[1], tstats[2],
tstats[3], tstats[4], tstats[5]) ;
fprintf(msgFile,
"\n\n factorization: raw mflops %8.3f, overall mflops %8.3f",
1.e-6*nfactorops/bridge->cpus[11],
1.e-6*nfactorops/bridge->cpus[13]) ;
fflush(msgFile) ;
/*--------------------------------------------------------------------*/
/*
------------------------
setup the parallel solve
------------------------
*/
rc = BridgeMPI_solveSetup(bridge) ;
fprintf(msgFile, "\n\n ----- PARALLEL SOLVE SETUP -----\n"
"\n CPU %8.3f : time to setup parallel solve",
bridge->cpus[14]) ;
if ( rc != 1 ) {
fprintf(stderr,
"\n error return %d from BridgeMPI_solveSetup()", rc) ;
MPI_Finalize() ;
exit(-1) ;
}
/*--------------------------------------------------------------------*/
/*
-----------------------------------------
processor 0 initializes a DenseMtx object
to hold the global solution matrix
-----------------------------------------
*/
if ( myid == 0 ) {
mtxX = DenseMtx_new() ;
DenseMtx_init(mtxX, type, 0, 0, neqns, nrhs, 1, neqns) ;
DenseMtx_zero(mtxX) ;
} else {
mtxX = NULL ;
}
/*
---------------------------------------------
the processors solve the system cooperatively
---------------------------------------------
*/
permuteflag = 1 ;
rc = BridgeMPI_solve(bridge, permuteflag, mtxX, mtxY) ;
if ( rc == 1 ) {
fprintf(msgFile, "\n\n solve complete successfully\n") ;
} else {
fprintf(msgFile, "\n" " return code from solve = %d\n", rc) ;
}
fprintf(msgFile, "\n\n ----- SOLVE -----\n"
"\n CPU %8.3f : time to permute rhs into new ordering"
"\n CPU %8.3f : time to distribute rhs "
"\n CPU %8.3f : time to initialize solution matrix "
"\n CPU %8.3f : time to solve linear system"
"\n CPU %8.3f : time to gather solution "
"\n CPU %8.3f : time to permute solution into old ordering"
"\n CPU %8.3f : total solve time"
"\n\n solve: raw mflops %8.3f, overall mflops %8.3f",
bridge->cpus[15], bridge->cpus[16], bridge->cpus[17],
bridge->cpus[18], bridge->cpus[19], bridge->cpus[20],
bridge->cpus[21],
1.e-6*nsolveops/bridge->cpus[18],
1.e-6*nsolveops/bridge->cpus[21]) ;
fflush(msgFile) ;
if ( myid == 0 ) {
if ( msglvl > 0 ) {
fprintf(msgFile, "\n\n solution matrix in original ordering") ;
DenseMtx_writeForHumanEye(mtxX, msgFile) ;
fflush(msgFile) ;
}
}
/*--------------------------------------------------------------------*/
/*
---------------------
free the working data
---------------------
*/
if ( myid == 0 ) {
InpMtx_free(mtxA) ;
DenseMtx_free(mtxX) ;
DenseMtx_free(mtxY) ;
}
BridgeMPI_free(bridge) ;
/*--------------------------------------------------------------------*/
MPI_Finalize() ;
return(1) ; }
/*--------------------------------------------------------------------*/
\end{verbatim}
|
