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numactl  2.0.8~rc4
Defines | Functions | Variables
stream_lib.h File Reference
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Defines

#define STREAM_NRESULTS   4

Functions

long stream_memsize (void)
long stream_init (void *mem)
void stream_test (double *res)
void stream_check (void)
void stream_setmem (unsigned long size)

Variables

int stream_verbose
char * stream_names []

Define Documentation

#define STREAM_NRESULTS   4

Definition at line 3 of file stream_lib.h.


Function Documentation

void stream_check ( void  )

Definition at line 91 of file stream_lib.c.

{
       int quantum;
       int BytesPerWord;
       register int j;
       double t;

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

       Vprintf(HLINE);
       BytesPerWord = sizeof(double);
       Vprintf("This system uses %d bytes per DOUBLE PRECISION word.\n",
              BytesPerWord);

       Vprintf(HLINE);
       Vprintf("Array size = %lu, Offset = %d\n", N, OFFSET);
       Vprintf("Total memory required = %.1f MB.\n",
              (3 * N * BytesPerWord) / 1048576.0);
       Vprintf("Each test is run %d times, but only\n", NTIMES);
       Vprintf("the *best* time for each is used.\n");

       /* Get initial value for system clock. */

       for (j = 0; j < N; j++) {
              a[j] = 1.0;
              b[j] = 2.0;
              c[j] = 0.0;
       }

       Vprintf(HLINE);

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

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

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

       Vprintf(HLINE);

       Vprintf("WARNING -- The above is only a rough guideline.\n");
       Vprintf("For best results, please be sure you know the\n");
       Vprintf("precision of your system timer.\n");
       Vprintf(HLINE);
}

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long stream_init ( void *  mem)

Definition at line 247 of file stream_lib.c.

{
       int i;

       for (i = 0; i < 4; i++) {
              rmstime[i] = 0;
              maxtime[i] = 0;
              mintime[i] = FLT_MAX;
       }

       bytes[0] = 2 * sizeof(double) * N;
       bytes[1] = 2 * sizeof(double) * N;
       bytes[2] = 3 * sizeof(double) * N;
       bytes[3] = 3 * sizeof(double) * N;

       a = mem;
       b = (double *)mem +   (N+OFFSET);
       c = (double *)mem + 2*(N+OFFSET);
       stream_check();
       return 0;
}

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long stream_memsize ( void  )

Definition at line 242 of file stream_lib.c.

{
       return 3*(sizeof(double) * (N+OFFSET)) ;
}

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void stream_setmem ( unsigned long  size)

Definition at line 237 of file stream_lib.c.

{
       N = (size - OFFSET) / (3*sizeof(double));
}

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void stream_test ( double *  res)

Definition at line 148 of file stream_lib.c.

{
       register int j, k;
       double scalar, times[4][NTIMES];

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

       scalar = 3.0;
       for (k = 0; k < NTIMES; k++) {
              times[0][k] = mysecond();
              for (j = 0; j < N; j++)
                     c[j] = a[j];
              times[0][k] = mysecond() - times[0][k];

              times[1][k] = mysecond();
              for (j = 0; j < N; j++)
                     b[j] = scalar * c[j];
              times[1][k] = mysecond() - times[1][k];

              times[2][k] = mysecond();
              for (j = 0; j < N; j++)
                     c[j] = a[j] + b[j];
              times[2][k] = mysecond() - times[2][k];

              times[3][k] = mysecond();
              for (j = 0; j < N; j++)
                     a[j] = b[j] + scalar * c[j];
              times[3][k] = mysecond() - times[3][k];
       }

       /*  --- SUMMARY --- */

       for (k = 0; k < NTIMES; k++) {
              for (j = 0; j < 4; j++) {
                     rmstime[j] =
                         rmstime[j] + (times[j][k] * times[j][k]);
                     mintime[j] = MIN(mintime[j], times[j][k]);
                     maxtime[j] = MAX(maxtime[j], times[j][k]);
              }
       }

       Vprintf
           ("Function      Rate (MB/s)   RMS time     Min time     Max time\n");
       for (j = 0; j < 4; j++) {
              double speed = 1.0E-06 * bytes[j] / mintime[j];

              rmstime[j] = sqrt(rmstime[j] / (double) NTIMES);

              Vprintf("%s%11.4f  %11.4f  %11.4f  %11.4f\n", label[j],
                     speed,
                     rmstime[j], mintime[j], maxtime[j]);

              if (res)
                     res[j] = speed;

       }
}

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Variable Documentation

char* stream_names[]

Definition at line 83 of file stream_lib.c.

Definition at line 87 of file stream_lib.c.