//------------------------------------------------------------------------------
// LAGraph/experimental/benchmark/KCore_demo.c: benchmark for kcore (single k-core)
//------------------------------------------------------------------------------

// LAGraph, (c) 2019-2022 by The LAGraph Contributors, All Rights Reserved.
// SPDX-License-Identifier: BSD-2-Clause
//
// For additional details (including references to third party source code and
// other files) see the LICENSE file or contact permission@sei.cmu.edu. See
// Contributors.txt for a full list of contributors. Created, in part, with
// funding and support from the U.S. Government (see Acknowledgments.txt file).
// DM22-0790

// Contributed by Pranav Konduri, Texas A&M University

//------------------------------------------------------------------------------



#include "../../src/benchmark/LAGraph_demo.h"
#include "LAGraphX.h"

// #define NTHREAD_LIST 2

// #define NTHREAD_LIST 1
// #define THREAD_LIST 0

// #define NTHREAD_LIST 6
// #define THREAD_LIST 64, 32, 24, 12, 8, 4

#define NTHREAD_LIST 7
#define THREAD_LIST 40, 20, 16, 8, 4, 2, 1

#define LG_FREE_ALL                 \
{                                   \
    LAGraph_Delete (&G, NULL) ;     \
    GrB_free (&A) ;                 \
    GrB_free (&D) ;                 \
    GrB_free (&c) ;                 \
}

int main (int argc, char **argv)
{
    //--------------------------------------------------------------------------
    // initialize LAGraph and GraphBLAS
    //--------------------------------------------------------------------------
    char msg [LAGRAPH_MSG_LEN] ;

    GrB_Vector c = NULL ;
    GrB_Matrix A = NULL ;
    GrB_Matrix D = NULL ;
    LAGraph_Graph G = NULL ;


    // start GraphBLAS and LAGraph
    bool burble = false ;
    demo_init (burble) ;

    int ntrials = 3 ;
    printf ("# of trials: %d\n", ntrials) ;

    int nt = NTHREAD_LIST ;
    int Nthreads [20] = { 0, THREAD_LIST } ;
    int nthreads_min ;
    int nthreads_max ;
    LAGRAPH_TRY (LAGraph_GetNumThreads (&nthreads_max, &nthreads_min, NULL)) ;
    if (Nthreads [1] == 0)
    {
        // create thread list automatically
        Nthreads [1] = nthreads_max ;
        for (int t = 2 ; t <= nt ; t++)
        {
            Nthreads [t] = Nthreads [t-1] / 2 ;
            if (Nthreads [t] == 0) nt = t-1 ;
        }
    }
    printf ("threads to test: ") ;
    for (int t = 1 ; t <= nt ; t++)
    {
        int nthreads = Nthreads [t] ;
        if (nthreads > nthreads_max) continue ;
        printf (" %d", nthreads) ;
    }
    printf ("\n") ;

    //--------------------------------------------------------------------------
    // read in the graph
    //--------------------------------------------------------------------------

    char *matrix_name = (argc > 1) ? argv [1] : "stdin" ;
    int k = (argc > 2) ? atoi(argv [2]) : 0;
    LAGRAPH_TRY (readproblem (&G, NULL,
        true, true, true, NULL, false, argc, argv)) ;

    GrB_Index n, nvals ;
    GRB_TRY (GrB_Matrix_nrows (&n, G->A)) ;
    GRB_TRY (GrB_Matrix_nvals (&nvals, G->A)) ;
    LAGRAPH_TRY (LAGraph_Graph_Print (G, LAGraph_SHORT, stdout, msg)) ;
    GRB_TRY (GrB_Matrix_new (&A, GrB_INT64, n, n)) ;
    GRB_TRY (GrB_assign (A, G->A, NULL, (double) 1,
        GrB_ALL, n, GrB_ALL, n, GrB_DESC_S)) ;
    GrB_free (&(G->A)) ;
    G->A = A ;

    GRB_TRY (GrB_Matrix_new (&D, GrB_INT64, n, n)) ;

    //--------------------------------------------------------------------------
    // kcore testing
    //--------------------------------------------------------------------------

    // warmup for more accurate timing
    LAGRAPH_TRY (LAGraph_SetNumThreads (24, 24, msg)) ;
    double tt = LAGraph_WallClockTime ( ) ;
    LAGRAPH_TRY (LAGraph_KCore (&c, G, k, msg)) ;
    LAGRAPH_TRY (LAGraph_Vector_Print (c, LAGraph_SHORT, stdout, msg)) ;
    tt = LAGraph_WallClockTime ( ) - tt ;
    printf("warmup time: %g sec\n\n", tt) ;
    // LAGRAPH_TRY (LAGraph_KCore_Decompose (&D, G, &c, k, msg)) ;
    GRB_TRY (GrB_free (&c)) ;
    //GRB_TRY (GrB_free(&D)) ;

    for (int t = 1 ; t <= nt ; t++)
    {
        int nthreads = Nthreads [t] ;
        if (nthreads > nthreads_max) continue ;
        LAGRAPH_TRY (LAGraph_SetNumThreads (nthreads, nthreads, msg)) ;
        double ttot = 0, ttrial [100] ;
        for (int trial = 0 ; trial < ntrials ; trial++)
        {
            double tt = LAGraph_WallClockTime ( ) ;
            LAGRAPH_TRY (LAGraph_KCore (&c, G, k, msg)) ;
            GRB_TRY (GrB_free (&c)) ;
            ttrial [trial] = LAGraph_WallClockTime ( ) - tt ;
            ttot += ttrial [trial] ;
            printf ("threads %2d trial %2d: %12.6f sec\n",
                nthreads, trial, ttrial [trial]) ;
        }
        ttot = ttot / ntrials ;

        printf ("Avg: "
            "nthreads: %3d time: %12.6f matrix: %s\n",
            nthreads, ttot, matrix_name) ;
    }

    LG_FREE_ALL ;
    LAGRAPH_TRY (LAGraph_Finalize (msg)) ;
    return (GrB_SUCCESS) ;
}