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//------------------------------------------------------------------------------
// GraphBLAS/Demo/Program/wathen_demo.c: test wathen
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2025, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// Construct a matrix using the wathen method.
//
// wathen_demo nx ny method nthreads
//
// nx and ny default to 10.
//
// methods:
// 0: build (the default, the fastest method)
// 1: assign scalars
// 2: assign finite elements, create F with a loop
// 3: assign finite elements, create F all at once
//
// nthreads: defaults # of threads from OpenMP
#include "graphblas_demos.h"
#include "wathen.c"
// macro used by OK(...) to free workspace if an error occurs
#undef FREE_ALL
#define FREE_ALL \
GrB_Matrix_free (&A) ; \
int main (int argc, char **argv)
{
GrB_Matrix A = NULL ;
GrB_Info info ;
OK (GrB_init (GrB_NONBLOCKING)) ;
// OK (GrB_Global_set_INT32 (GrB_GLOBAL, true, GxB_BURBLE)) ;
//--------------------------------------------------------------------------
// get inputs
//--------------------------------------------------------------------------
int64_t nx = 10, ny = 10 ;
int method = 0 ;
int nthreads ;
if (argc > 1) nx = strtol (argv [1], NULL, 0) ;
if (argc > 2) ny = strtol (argv [2], NULL, 0) ;
if (argc > 3) method = strtol (argv [3], NULL, 0) ;
if (argc > 4)
{
nthreads = strtol (argv [4], NULL, 0) ;
OK (GrB_Global_set_INT32 (GrB_GLOBAL, nthreads, GxB_NTHREADS)) ;
}
OK (GrB_Global_get_INT32 (GrB_GLOBAL, &nthreads, GxB_NTHREADS)) ;
fprintf (stderr, "Wathen: nx %d ny %d method: %d nthreads: %d ",
(int) nx, (int) ny, method, nthreads) ;
//--------------------------------------------------------------------------
// create a Wathen matrix
//--------------------------------------------------------------------------
uint64_t state = 1 ;
double t = WALLCLOCK ;
OK (wathen (&A, nx, ny, false, method, NULL, &state)) ;
t = WALLCLOCK - t ;
fprintf (stderr, "time: %g\n", t) ;
GrB_Index n ;
OK (GrB_Matrix_nrows (&n, A)) ;
if (n < 1000)
{
OK (GxB_Matrix_fprint (A, "A", GxB_SUMMARY, stdout)) ;
}
FREE_ALL ;
OK (GrB_finalize ( )) ;
}
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