xref: /petsc/src/benchmarks/streams/OpenMPVersion.c (revision 511c7730c31e50e28ad0b6cd5ea706dbebda73c8)

/*-----------------------------------------------------------------------*/
/* Program: Stream                                                       */
/* Revision: $Id: stream.c,v 5.9 2009/04/11 16:35:00 mccalpin Exp mccalpin $ */
/* Original code developed by John D. McCalpin                           */
/* Programmers: John D. McCalpin                                         */
/*              Joe R. Zagar                                             */
/*                                                                       */
/* This program measures memory transfer rates in MB/s for simple        */
/* computational kernels coded in C.                                     */
/*-----------------------------------------------------------------------*/
/* Copyright 1991-2005: John D. McCalpin                                 */
/*-----------------------------------------------------------------------*/
/* License:                                                              */
/*  1. You are free to use this program and/or to redistribute           */
/*     this program.                                                     */
/*  2. You are free to modify this program for your own use,             */
/*     including commercial use, subject to the publication              */
/*     restrictions in item 3.                                           */
/*  3. You are free to publish results obtained from running this        */
/*     program, or from works that you derive from this program,         */
/*     with the following limitations:                                   */
/*     3a. In order to be referred to as "STREAM benchmark results",     */
/*         published results must be in conformance to the STREAM        */
/*         Run Rules, (briefly reviewed below) published at              */
/*         http://www.cs.virginia.edu/stream/ref.html                    */
/*         and incorporated herein by reference.                         */
/*         As the copyright holder, John McCalpin retains the            */
/*         right to determine conformity with the Run Rules.             */
/*     3b. Results based on modified source code or on runs not in       */
/*         accordance with the STREAM Run Rules must be clearly          */
/*         labelled whenever they are published.  Examples of            */
/*         proper labelling include:                                     */
/*         "tuned STREAM benchmark results"                              */
/*         "based on a variant of the STREAM benchmark code"             */
/*         Other comparable, clear and reasonable labelling is           */
/*         acceptable.                                                   */
/*     3c. Submission of results to the STREAM benchmark web site        */
/*         is encouraged, but not required.                              */
/*  4. Use of this program or creation of derived works based on this    */
/*     program constitutes acceptance of these licensing restrictions.   */
/*  5. Absolutely no warranty is expressed or implied.                   */
/*-----------------------------------------------------------------------*/
# include <stdio.h>
# include <math.h>
# include <limits.h>
# include <float.h>
# include <sys/time.h>

/* INSTRUCTIONS:
 *
 *      1) Stream requires a good bit of memory to run.  Adjust the
 *          value of 'N' (below) to give a 'timing calibration' of
 *          at least 20 clock-ticks.  This will provide rate estimates
 *          that should be good to about 5% precision.
 */

#ifndef N
#   define N    2000000
#endif
#ifndef NTIMES
#   define NTIMES       50
#endif
#ifndef OFFSET
#   define OFFSET       0
#endif

/*
 *      3) Compile the code with full optimization.  Many compilers
 *         generate unreasonably bad code before the optimizer tightens
 *         things up.  If the results are unreasonably good, on the
 *         other hand, the optimizer might be too smart for me!
 *
 *         Try compiling with:
 *               cc -O stream_omp.c -o stream_omp
 *
 *         This is known to work on Cray, SGI, IBM, and Sun machines.
 *
 *
 *      4) Mail the results to mccalpin@cs.virginia.edu
 *         Be sure to include:
 *              a) computer hardware model number and software revision
 *              b) the compiler flags
 *              c) all of the output from the test case.
 * Thanks!
 *
 */

# define HLINE "-------------------------------------------------------------\n"

# ifndef MIN
# define MIN(x,y) ((x)<(y)?(x):(y))
# endif
# ifndef MAX
# define MAX(x,y) ((x)>(y)?(x):(y))
# endif

static double   a[N+OFFSET],
                b[N+OFFSET],
                c[N+OFFSET];

static double   avgtime[4] = {0}, maxtime[4] = {0},
                mintime[4] = {FLT_MAX,FLT_MAX,FLT_MAX,FLT_MAX};

static const char     *label[4] = {"Copy:      ", "Scale:     ","Add:       ", "Triad:     "};

static double   bytes[4] = {
    2 * sizeof(double) * N,
    2 * sizeof(double) * N,
    3 * sizeof(double) * N,
    3 * sizeof(double) * N
    };

extern double mysecond();
extern void checkSTREAMresults();
#ifdef TUNED
extern void tuned_STREAM_Copy();
extern void tuned_STREAM_Scale(double scalar);
extern void tuned_STREAM_Add();
extern void tuned_STREAM_Triad(double scalar);
#endif
extern int omp_get_num_threads();
int main()
    {
    int                 quantum, checktick();
    int                 BytesPerWord;
    register int        j, k;
    double              scalar, t, times[4][NTIMES];

    /* --- SETUP --- determine precision and check timing --- */

    /*printf(HLINE);
    printf("STREAM version $Revision: 5.9 $\n");
     printf(HLINE); */
    BytesPerWord = sizeof(double);
    /*    printf("This system uses %d bytes per DOUBLE PRECISION word.\n",
     BytesPerWord);

     printf(HLINE);
#ifdef NO_LONG_LONG
    printf("Array size = %d, Offset = %d\n" , N, OFFSET);
#else
    printf("Array size = %llu, Offset = %d\n", (unsigned long long) N, OFFSET);
#endif

    printf("Total memory required = %.1f MB.\n",
        (3.0 * BytesPerWord) * ( (double) N / 1048576.0));
    printf("Each test is run %d times, but only\n", NTIMES);
    printf("the *best* time for each is used.\n");

     printf(HLINE); */
#pragma omp parallel
    {
#pragma omp master
        {
            k = omp_get_num_threads();
    printf(HLINE);
            printf ("Number of OpenMP Threads requested = %i\n",k);
        }
    }



    /* Get initial value for system clock. */
#pragma omp parallel for
    for (j=0; j<N; j++) {
        a[j] = 1.0;
        b[j] = 2.0;
        c[j] = 0.0;
        }

    /*printf(HLINE);*/

    if  ( (quantum = checktick()) >= 1)
      ;/*  printf("Your clock granularity/precision appears to be "
        "%d microseconds.\n", quantum);*/
    else {
      ;/*  printf("Your clock granularity appears to be "
        "less than one microsecond.\n");*/
        quantum = 1;
    }

    t = mysecond();
#pragma omp parallel for
    for (j = 0; j < N; j++)
        a[j] = 2.0E0 * a[j];
    t = 1.0E6 * (mysecond() - t);

    /*printf("Each test below will take on the order"
        " of %d microseconds.\n", (int) t  );
    printf("   (= %d clock ticks)\n", (int) (t/quantum) );
    printf("Increase the size of the arrays if this shows that\n");
    printf("you are not getting at least 20 clock ticks per test.\n");

     printf(HLINE);*/

    /*  --- MAIN LOOP --- repeat test cases NTIMES times --- */

    scalar = 3.0;
    for (k=0; k<NTIMES; k++)
        {
        times[0][k] = mysecond();
#ifdef TUNED
        tuned_STREAM_Copy();
#else
#pragma omp parallel for
        for (j=0; j<N; j++)
            c[j] = a[j];
#endif
        times[0][k] = mysecond() - times[0][k];

        times[1][k] = mysecond();
#ifdef TUNED
        tuned_STREAM_Scale(scalar);
#else
#pragma omp parallel for
        for (j=0; j<N; j++)
            b[j] = scalar*c[j];
#endif
        times[1][k] = mysecond() - times[1][k];

        times[2][k] = mysecond();
#ifdef TUNED
        tuned_STREAM_Add();
#else
#pragma omp parallel for
        for (j=0; j<N; j++)
            c[j] = a[j]+b[j];
#endif
        times[2][k] = mysecond() - times[2][k];

        times[3][k] = mysecond();
#ifdef TUNED
        tuned_STREAM_Triad(scalar);
#else
#pragma omp parallel for
        for (j=0; j<N; j++)
            a[j] = b[j]+scalar*c[j];
#endif
        times[3][k] = mysecond() - times[3][k];
        }

    /*  --- SUMMARY --- */

    for (k=1; k<NTIMES; k++) /* note -- skip first iteration */
        {
        for (j=0; j<4; j++)
            {
            avgtime[j] = avgtime[j] + times[j][k];
            mintime[j] = MIN(mintime[j], times[j][k]);
            maxtime[j] = MAX(maxtime[j], times[j][k]);
            }
        }

    printf("Function      Rate (MB/s) \n");
    for (j=0; j<4; j++) {
        avgtime[j] = avgtime[j]/(double)(NTIMES-1);

	printf("%s%11.4f  \n", label[j], 1.0E-06 * bytes[j]/mintime[j]);
    }
    /* printf(HLINE);*/

    /* --- Check Results --- */
    checkSTREAMresults();
    /*    printf(HLINE);*/

    return 0;
}

# define	M	20

int
checktick()
    {
    int		i, minDelta, Delta;
    double	t1, t2, timesfound[M];

/*  Collect a sequence of M unique time values from the system. */

    for (i = 0; i < M; i++) {
	t1 = mysecond();
	while( ((t2=mysecond()) - t1) < 1.0E-6 )
	    ;
	timesfound[i] = t1 = t2;
	}

/*
 * Determine the minimum difference between these M values.
 * This result will be our estimate (in microseconds) for the
 * clock granularity.
 */

    minDelta = 1000000;
    for (i = 1; i < M; i++) {
	Delta = (int)( 1.0E6 * (timesfound[i]-timesfound[i-1]));
	minDelta = MIN(minDelta, MAX(Delta,0));
	}

   return(minDelta);
    }



/* A gettimeofday routine to give access to the wall
   clock timer on most UNIX-like systems.  */

#include <sys/time.h>

double mysecond()
{
        struct timeval tp;
        struct timezone tzp;
        int i;

        i = gettimeofday(&tp,&tzp);
        return ( (double) tp.tv_sec + (double) tp.tv_usec * 1.e-6 );
}

void checkSTREAMresults ()
{
	double aj,bj,cj,scalar;
	double asum,bsum,csum;
	double epsilon;
	int	j,k;

    /* reproduce initialization */
	aj = 1.0;
	bj = 2.0;
	cj = 0.0;
    /* a[] is modified during timing check */
	aj = 2.0E0 * aj;
    /* now execute timing loop */
	scalar = 3.0;
	for (k=0; k<NTIMES; k++)
        {
            cj = aj;
            bj = scalar*cj;
            cj = aj+bj;
            aj = bj+scalar*cj;
        }
	aj = aj * (double) (N);
	bj = bj * (double) (N);
	cj = cj * (double) (N);

	asum = 0.0;
	bsum = 0.0;
	csum = 0.0;
	for (j=0; j<N; j++) {
		asum += a[j];
		bsum += b[j];
		csum += c[j];
	}
#ifdef VERBOSE
	printf ("Results Comparison: \n");
	printf ("        Expected  : %f %f %f \n",aj,bj,cj);
	printf ("        Observed  : %f %f %f \n",asum,bsum,csum);
#endif

#ifndef abs
#define abs(a) ((a) >= 0 ? (a) : -(a))
#endif
	epsilon = 1.e-8;

	if (abs(aj-asum)/asum > epsilon) {
		printf ("Failed Validation on array a[]\n");
		printf ("        Expected  : %f \n",aj);
		printf ("        Observed  : %f \n",asum);
	}
	else if (abs(bj-bsum)/bsum > epsilon) {
		printf ("Failed Validation on array b[]\n");
		printf ("        Expected  : %f \n",bj);
		printf ("        Observed  : %f \n",bsum);
	}
	else if (abs(cj-csum)/csum > epsilon) {
		printf ("Failed Validation on array c[]\n");
		printf ("        Expected  : %f \n",cj);
		printf ("        Observed  : %f \n",csum);
	}
	else {
          ;/*	printf ("Solution Validates\n"); */
	}
}

void tuned_STREAM_Copy()
{
	int j;
#pragma omp parallel for
        for (j=0; j<N; j++)
            c[j] = a[j];
}

void tuned_STREAM_Scale(double scalar)
{
	int j;
#pragma omp parallel for
	for (j=0; j<N; j++)
	    b[j] = scalar*c[j];
}

void tuned_STREAM_Add()
{
	int j;
#pragma omp parallel for
	for (j=0; j<N; j++)
	    c[j] = a[j]+b[j];
}

void tuned_STREAM_Triad(double scalar)
{
	int j;
#pragma omp parallel for
	for (j=0; j<N; j++)
	    a[j] = b[j]+scalar*c[j];
}