int main (int argc, char **argv) { //-------------------------------------------------------------------------- // initializations //-------------------------------------------------------------------------- GrB_Info info ; GrB_Matrix A = NULL ; PageRank *Pd = NULL, *P2 = NULL ; iPageRank *Pi = NULL ; double tic [2], t ; OK (GrB_init (GrB_NONBLOCKING)) ; fprintf (stderr, "\npagerank_demo:\n") ; printf ( "\npagerank_demo:\n") ; //-------------------------------------------------------------------------- // read a matrix from stdin //-------------------------------------------------------------------------- bool one_based = false ; if (argc > 1) one_based = strtol (argv [1], NULL, 0) ; OK (read_matrix (&A, stdin, // read matrix from stdin false, // unsymmetric false, // self edges OK one_based, // 0-based or 1-based, depending on input arg true, // read input file as Boolean true)) ; // print status to stdout GrB_Index n, nvals ; OK (GrB_Matrix_nrows (&n, A)) ; OK (GrB_Matrix_nvals (&nvals, A)) ; //-------------------------------------------------------------------------- // compute the page rank via a real semiring //-------------------------------------------------------------------------- simple_tic (tic) ; OK (dpagerank (&Pd, A)) ; t = simple_toc (tic) ; fprintf (stderr, "n %g edges %g dpagerank time : %14.6f iters: 20\n", (double) n, (double) nvals, t) ; printf ( "n %g edges %g dpagerank time : %14.6f iters: 20\n", (double) n, (double) nvals, t) ; //-------------------------------------------------------------------------- // compute the page rank via an integer semiring //-------------------------------------------------------------------------- simple_tic (tic) ; OK (ipagerank (&Pi, A)) ; t = simple_toc (tic) ; fprintf (stderr, "n %g edges %g ipagerank time : %14.6f iters: 20\n", (double) n, (double) nvals, t) ; printf ( "n %g edges %g ipagerank time : %14.6f iters: 20\n", (double) n, (double) nvals, t) ; //-------------------------------------------------------------------------- // compute the page rank via an extreme semiring //-------------------------------------------------------------------------- int iters ; simple_tic (tic) ; OK (dpagerank2 (&P2, A, 100, 1e-5, &iters, GxB_DEFAULT)) ; t = simple_toc (tic) ; fprintf (stderr, "n %g edges %g dpagerank time : %14.6f iters: %d\n", (double) n, (double) nvals, t, iters) ; printf ( "n %g edges %g dpagerank time : %14.6f iters: %d\n", (double) n, (double) nvals, t, iters) ; //-------------------------------------------------------------------------- // print results //-------------------------------------------------------------------------- int64_t limit = MIN (n, 5000) ; printf ("Top %g nodes:\n", (double) limit) ; for (int64_t i = 0 ; i < limit ; i++) { printf ("%5g d:[%6g : %16.8e] i:[%6g : %16.8e] x:[%6g : %16.8e]", (double) i, (double) Pd [i].page, (double) Pd [i].pagerank, (double) Pi [i].page, (double) Pi [i].pagerank, (double) P2 [i].page, (double) P2 [i].pagerank) ; if (Pd [i].page != Pi [i].page || Pd [i].page != P2 [i].page) { printf ("mismatch") ; } printf ("\n") ; } //-------------------------------------------------------------------------- // free all workspace //-------------------------------------------------------------------------- FREE_ALL ; GrB_finalize ( ) ; }
GrB_Info read_matrix // read a double-precision or boolean matrix ( GrB_Matrix *A_output, // handle of matrix to create FILE *f, // file to read the tuples from bool make_symmetric, // if true, return A as symmetric bool no_self_edges, // if true, then remove self edges from A bool one_based, // if true, input matrix is 1-based bool boolean, // if true, input is GrB_BOOL, otherwise GrB_FP64 bool pr // if true, print status to stdout ) { int64_t len = 256 ; int64_t ntuples = 0 ; double x ; GrB_Index nvals ; //-------------------------------------------------------------------------- // set all pointers to NULL so that FREE_ALL can free everything safely //-------------------------------------------------------------------------- GrB_Matrix C = NULL, A = NULL, B = NULL ; GrB_Descriptor dt1 = NULL, dt2 = NULL ; GrB_UnaryOp scale2_op = NULL ; //-------------------------------------------------------------------------- // allocate initial space for tuples //-------------------------------------------------------------------------- size_t xsize = ((boolean) ? sizeof (bool) : sizeof (double)) ; GrB_Index *I = malloc (len * sizeof (int64_t)), *I2 = NULL ; GrB_Index *J = malloc (len * sizeof (int64_t)), *J2 = NULL ; void *X = malloc (len * xsize) ; bool *Xbool ; double *Xdouble ; void *X2 = NULL ; if (I == NULL || J == NULL || X == NULL) { // out of memory if (pr) printf ("out of memory for initial tuples\n") ; FREE_ALL ; return (GrB_OUT_OF_MEMORY) ; } Xbool = (bool *) X ; Xdouble = (double *) X ; //-------------------------------------------------------------------------- // read in the tuples from stdin, one per line //-------------------------------------------------------------------------- // format warnings vary with compilers, so read in as double double i2, j2 ; while (fscanf (f, "%lg %lg %lg\n", &i2, &j2, &x) != EOF) { int64_t i = (int64_t) i2 ; int64_t j = (int64_t) j2 ; if (ntuples >= len) { I2 = realloc (I, 2 * len * sizeof (int64_t)) ; J2 = realloc (J, 2 * len * sizeof (int64_t)) ; X2 = realloc (X, 2 * len * xsize) ; if (I2 == NULL || J2 == NULL || X2 == NULL) { if (pr) printf ("out of memory for tuples\n") ; FREE_ALL ; return (GrB_OUT_OF_MEMORY) ; } I = I2 ; I2 = NULL ; J = J2 ; J2 = NULL ; X = X2 ; X2 = NULL ; len = len * 2 ; Xbool = (bool *) X ; Xdouble = (double *) X ; } if (one_based) { i-- ; j-- ; } I [ntuples] = i ; J [ntuples] = j ; if (boolean) { Xbool [ntuples] = (x != 0) ; } else { Xdouble [ntuples] = x ; } ntuples++ ; } //-------------------------------------------------------------------------- // find the dimensions //-------------------------------------------------------------------------- if (pr) printf ("ntuples: %.16g\n", (double) ntuples) ; int64_t nrows = 0 ; int64_t ncols = 0 ; for (int64_t k = 0 ; k < ntuples ; k++) { nrows = MAX (nrows, I [k]) ; ncols = MAX (ncols, J [k]) ; } nrows++ ; ncols++ ; if (pr) printf ("nrows %.16g ncols %.16g\n", (double) nrows, (double) ncols) ; //-------------------------------------------------------------------------- // prune self edges //-------------------------------------------------------------------------- // but not if creating the augmented system aka a bipartite graph double tic [2], t1 ; simple_tic (tic) ; if (no_self_edges && ! (make_symmetric && nrows != ncols)) { int64_t ntuples2 = 0 ; for (int64_t k = 0 ; k < ntuples ; k++) { if (I [k] != J [k]) { // keep this off-diagonal edge I [ntuples2] = I [k] ; J [ntuples2] = J [k] ; if (boolean) { Xbool [ntuples2] = Xbool [k] ; } else { Xdouble [ntuples2] = Xdouble [k] ; } ntuples2++ ; } } ntuples = ntuples2 ; } t1 = simple_toc (tic) ; if (pr) printf ("time to prune self-edges: %12.6f\n", t1) ; //-------------------------------------------------------------------------- // build the matrix, summing up duplicates, and then free the tuples //-------------------------------------------------------------------------- GrB_Type xtype ; GrB_BinaryOp xop, xop2 ; if (boolean) { xtype = GrB_BOOL ; xop = GrB_LOR ; xop2 = GrB_FIRST_BOOL ; } else { xtype = GrB_FP64 ; xop = GrB_PLUS_FP64 ; xop2 = GrB_FIRST_FP64 ; } simple_tic (tic) ; GrB_Info info ; OK (GrB_Matrix_new (&C, xtype, nrows, ncols)) ; if (boolean) { OK (GrB_Matrix_build (C, I, J, Xbool, ntuples, xop)) ; } else { OK (GrB_Matrix_build (C, I, J, Xdouble, ntuples, xop)) ; } t1 = simple_toc (tic) ; if (pr) printf ("time to build the graph with GrB_Matrix_build: %12.6f\n", t1) ; #ifdef TEST_SETELEMENT { // This is just for testing performance of GrB_setElement and comparing // with GrB_build. It is not needed if this function is used in // production. // setElement will be just about as fast as build (perhaps 10% to 50% // more time) with non-blocking mode. If blocking mode is enabled, // setElement will be extremely and painfully slow since the matrix is // rebuilt every time a single entry is added. simple_tic (tic) ; OK (GrB_Matrix_new (&B, xtype, nrows, ncols)) ; for (int64_t k = 0 ; k < ntuples ; k++) { // B (I[k], J[k]) = X [k] GrB_Matrix_setElement (B, X [k], I [k], J [k]) ; } // force completion of B GrB_Matrix_nvals (&nvals, B) ; double t2 = simple_toc (tic) ; if (pr) printf ("time to build the graph with GrB_setElement:" " %12.6f\n", t2) ; GrB_free (&B) ; } #endif free (I) ; I = NULL ; free (J) ; J = NULL ; free (X) ; X = NULL ; //-------------------------------------------------------------------------- // construct the descriptors //-------------------------------------------------------------------------- // descriptor dt2: transpose the 2nd input OK (GrB_Descriptor_new (&dt2)) ; OK (GrB_Descriptor_set (dt2, GrB_INP1, GrB_TRAN)) ; // descriptor dt1: transpose the 1st input OK (GrB_Descriptor_new (&dt1)) ; OK (GrB_Descriptor_set (dt1, GrB_INP0, GrB_TRAN)) ; //-------------------------------------------------------------------------- // create the output matrix //-------------------------------------------------------------------------- if (make_symmetric) { //---------------------------------------------------------------------- // ensure the matrix is symmetric //---------------------------------------------------------------------- if (pr) printf ("make symmetric\n") ; if (nrows == ncols) { //------------------------------------------------------------------ // A = (C+C')/2 //------------------------------------------------------------------ if (pr) printf ("A = (C+C')/2\n") ; double tic [2], t ; simple_tic (tic) ; OK (GrB_Matrix_new (&A, xtype, nrows, nrows)) ; OK (GrB_eWiseAdd (A, NULL, NULL, xop, C, C, dt2)) ; OK (GrB_free (&C)) ; if (boolean) { *A_output = A ; A = NULL ; } else { OK (GrB_Matrix_new (&C, xtype, nrows, nrows)) ; OK (GrB_UnaryOp_new (&scale2_op, scale2, xtype, xtype)) ; OK (GrB_apply (C, NULL, NULL, scale2_op, A, NULL)) ; OK (GrB_free (&A)) ; OK (GrB_free (&scale2_op)) ; *A_output = C ; C = NULL ; } t = simple_toc (tic) ; if (pr) printf ("A = (C+C')/2 time %12.6f\n", t) ; } else { //------------------------------------------------------------------ // A = [0 C ; C' 0], a bipartite graph //------------------------------------------------------------------ // no self edges will exist if (pr) printf ("A = [0 C ; C' 0], a bipartite graph\n") ; double tic [2], t ; simple_tic (tic) ; int64_t n = nrows + ncols ; OK (GrB_Matrix_new (&A, xtype, n, n)) ; GrB_Index I_range [3], J_range [3] ; I_range [GxB_BEGIN] = 0 ; I_range [GxB_END ] = nrows-1 ; J_range [GxB_BEGIN] = nrows ; J_range [GxB_END ] = ncols+nrows-1 ; // A (nrows:n-1, 0:nrows-1) += C' OK (GrB_assign (A, NULL, xop2, // or NULL, C, J_range, GxB_RANGE, I_range, GxB_RANGE, dt1)) ; // A (0:nrows-1, nrows:n-1) += C OK (GrB_assign (A, NULL, xop2, // or NULL, C, I_range, GxB_RANGE, J_range, GxB_RANGE, NULL)) ; // force completion; if this statement does not appear, the // timing will not account for the final build, which would be // postponed until A is used by the caller in another GraphBLAS // operation. GrB_Matrix_nvals (&nvals, A) ; t = simple_toc (tic) ; if (pr) printf ("time to construct augmented system: %12.6f\n", t) ; *A_output = A ; // set A to NULL so the FREE_ALL macro does not free *A_output A = NULL ; } } else { //---------------------------------------------------------------------- // return the matrix as-is //---------------------------------------------------------------------- if (pr) printf ("leave A as-is\n") ; *A_output = C ; // set C to NULL so the FREE_ALL macro does not free *A_output C = NULL ; } //-------------------------------------------------------------------------- // success: free everything except the result, and return it to the caller //-------------------------------------------------------------------------- FREE_ALL ; if (pr) printf ("\nMatrix from file:\n") ; GxB_print (*A_output, pr ? GxB_SHORT : GxB_SILENT) ; return (GrB_SUCCESS) ; }
int main (void) { double *x ; double tic [2], t ; int i ; fprintf (stderr, "simple_demo:\n") ; double n = ((double) LEN) / 1e6 ; /* calloc the space for more accurate timing */ x = calloc (LEN, sizeof (double)) ; if (x == NULL) { fprintf (stderr, "simple_demo: out of memory\n") ; exit (1) ; } /* do lots of tics */ simple_tic (tic) ; for (i = 0 ; i < LEN/10 ; i++) { double tic2 [2] ; simple_tic (tic2) ; } t = simple_toc (tic) ; printf ("time to call simple_tic %g million times: %g\n", n/10, t) ; /* generate random numbers */ simple_tic (tic) ; for (i = 0 ; i < LEN ; i++) { x [i] = simple_rand_x ( ) ; } t = simple_toc (tic) ; /* report the result */ printf ("time to generate %g million random numbers: %g\n", n, t) ; fprintf (stderr, "time to generate %g million random numbers: %g\n\n", n, t) ; /* these should be the same on any system and any compiler */ printf ("first 10 random numbers:\n") ; for (i = 0 ; i < 10 ; i++) { printf ("%12.6f\n", x [i]) ; } /* generate random uint64_t numbers */ double t1 ; simple_tic (tic) ; for (i = 0 ; i < LEN ; i++) { simple_rand_i ( ) ; } t1 = simple_toc (tic) ; printf ("time to generate %g million random uint64: %g\n", n, t1) ; fprintf (stderr, "time to generate %g million random uint64: %g\n\n", n, t1) ; free (x) ; }