write throughput

gistfile1.c

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#ifdef _WIN32
#include <windows.h>
double
sec()
{
    LARGE_INTEGER freq, v;

    QueryPerformanceFrequency(&freq);
    QueryPerformanceCounter(&v);

    return v.QuadPart / (double)freq.QuadPart;
}
HANDLE log_file2;

#else
#include <sys/time.h>
#include <fcntl.h>
double
sec()
{
    struct timeval tv;

    gettimeofday(&tv, NULL);

    return tv.tv_sec + tv.tv_usec / 1000000.0;
}

int log_file2;
#endif


int
main(int argc, char **argv)
{
    int size = 64;
    int sizei, counti;
    FILE *result = fopen("result.csv", "w");

    fprintf(result, "size,time,,size,sec/byte\n");

    for (sizei=1; sizei<128; sizei++) {
        int size2 = size * sizei;

#ifdef _WIN32
        HANDLE log_file2 = CreateFile("bench.txt", GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, 0, NULL);
#else
        int log_file2 = open("bench.txt", O_WRONLY|O_CREAT|O_TRUNC, 0666);
#endif

        char *buffer = malloc(size2);
        double start, end, dt;

        memset(buffer, 'a', size2);
        buffer[size2-2] = '\r';
        buffer[size2-1] = '\n';

        start = sec();
        for (counti=0; counti<256; counti++) {
#ifdef _WIN32
            WriteFile(log_file2, buffer, size2, NULL, NULL);
#else
            write(log_file2, buffer, size2);
#endif
        }
        end = sec();

        dt = (end-start) / 256;
        fprintf(result, "%d,%.20f,,%d,%.20f\n", size2, dt, size2, dt/size2);

        free(buffer);
#ifdef _WIN32
        CloseHandle(log_file2);
#else
        close(log_file2);
#endif
    }

    fclose(result);
}