benchmark.c

/*
fibonacci C benchmark program v1.3
made by James Wait. forgive my terrible coding, it's messy and inefficient as this is one of my first C programs
Compile with "gcc -o benchmark benchmark.c"
calculates 40th fibonacci number 8 times, records each calculation time and multiplies it by 8.
It then averages these numbers and returns the result as the final score.

There are no command line arguments.... yet

Also... don't use this as a serious benchmarking tool. it's inacurate and bad in many other ways
but it gives you a rough indication of how fast your computer is compared to other systems.
============================
EXAMPLE OUTPUT/RESULTS:
(RASPBERRY PI B 256MB)
Result of fib(40):
CALCULATING...
165580141

Benchmarking....
1/8...
2/8...
3/8...
4/8...
5/8...
6/8...
7/8...
8/8...
=-=-=-=-=-=-=-=-=-=
CALCULATING SCORES....
80.623535
82.071993
81.830015
80.193880
80.741247
84.901833
81.720455
=-=-=-=-=-=-=-=-=-=
CALCULATING AVERAGE....
=-=-=-=-=-=-=-=-=-=


=-=-=-=-=-=-=-=-=-=
Final Score (lower is better)
81.726137
=-=-=-=-=-=-=-=-=-=

(CUSTOM PC UBUNTU I3-2100 4GB RAM)
james@james-H67MA-D2H-B3:~$ ./benchmark
CPU Model:
Intel(R) Core(TM) i3-2100 CPU @ 3.10GHz

Result of fib(40):
Calculating....
165580141

Benchmarking....
1/8...
2/8...
3/8...
4/8...
5/8...
6/8...
7/8...
8/8...
=-=-=-=-=-=-=-=-=-=
Calculating Scores....
6.576176
6.553473
6.538544
6.538626
6.532127
6.535168
6.531120

Calculating Average....

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Final Score (lower is better)
6.543605
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

(BELLARD.ORG/JSLINUX/)
4953.692964
*/

//START PROGRAM


#include <stdio.h>
// sys/time.h and /sys/resource.h may not work on windows
#include <sys/time.h>
#include <sys/resource.h>
//Timer setup

//get_time MAY not work for windows.
double get_time()
{
    struct timeval t;
    struct timezone tzp;
    gettimeofday(&t, &tzp);
    return t.tv_sec + t.tv_usec*1e-6;
}
//fibonacci number function
int fib(n)
{
    if (n < 2)
        return 1;
    return fib(n-2) + fib(n-1);
}

//MAIN
int main(int argc, char const* argv[])
{
//commment this section out if you are not compiling for linux
//============================================================
    printf("CPU Model:\n");
    //Get CPU model
    int n;
    char line[1024], *p;
    FILE *f;

    if (!(f = fopen("/proc/cpuinfo", "r"))) //reads from /proc/cpuinfo and finds the "model_name" line
        err(1, "fopen");
    n = 5;
    while (n--)
        if(!fgets(line, sizeof(line), f))
            err(1, "fgets");
    fclose(f);
    n = strlen(line);
    line[--n] = '\0';

    if ((p = strchr(line, ':')) && (p + 2 - line) < n)
        fputs(p + 2, stdout);

    //finish get cpu model
//==============================================================
    printf("\n\nResult of fib(40):\nCalculating....\n");
    //REMOVED BECAUSE CAUSED INACCURACIES
    //double time = get_time(); //gets the time
    printf("%d\n\n", fib(40));      //calculates and prints fib(40)
    //double time2 = get_time();    //gets time took to calculate
    //END
    printf("Benchmarking....\n");
    printf("1/8...\n");
    double time3 = get_time();
    fib(40);
    double time4 = get_time();
    printf("2/8...\n");
    double time5 = get_time();
    fib(40);
    double time6 = get_time();
    printf("3/8...\n");
    double time7 = get_time();
    fib(40);
    double time8 = get_time();
    printf("4/8...\n");
    double time9 = get_time();
    fib(40);
    double time10 = get_time();
    printf("5/8...\n");
    double time11 = get_time();
    fib(40);
    double time12 = get_time();
    printf("6/8...\n");
    double time13 = get_time();
    fib(40);
    double time14 = get_time();
    printf("7/8...\n");
    double time15 = get_time();
    fib(40);
    double time16 = get_time();
    printf("8/8...\n");
    double time17 = get_time();
    fib(40);
    double time18 = get_time();

//
//Calculates results (time & averages)
//
//   printf("Score (lower is better):\n");
    printf("=-=-=-=-=-=-=-=-=-=\n");
    printf("Calculating Scores....\n");
//
    // printf("%f\n", time2*8 - time*8); //prints
    //double score1 = time2*8 - time*8; //gets time taken to calculate * 2
//
    printf("%f\n", time4*8 - time3*8);
    double score2 = time4*8 - time3*8;
//
    printf("%f\n", time6*8 - time5*8);
    double score3 = time6*8 - time5*8;
//
    printf("%f\n", time8*8 - time7*8);
    double score4 = time8*8 - time7*8;
//
    printf("%f\n", time10*8 - time9*8);
    double score5 = time10*8 - time9*8;
//
    printf("%f\n", time12*8 - time11*8);
    double score6 = time12*8 - time11*8;
//
    printf("%f\n", time14*8 - time13*8);
    double score7 = time14*8 - time13*8;
//
    printf("%f\n", time16*8 - time15*8);
    double score8 = time16*8 - time15*8;
//
    printf("\n");
    printf("Calculating Average....\n");
    double average = score2 + score3 + score4 + score5 + score6 + score7 + score8; //calculates MEAN
    double final = average / 7;             //continued
    printf("\n");
    printf("=-=-=-=-=-=-=-=-=-=-=-=-=-=-=\n");
    printf("Final Score (lower is better)\n");

    printf("%f\n", final);                  //prints final result
    printf("=-=-=-=-=-=-=-=-=-=-=-=-=-=-=\n\n");



//printf("%d\n", get_time());
    return 0;
}