Fully optimised plots about gpuplotgenerator HOT 2 CLOSED

    unsigned long long file_size = ((unsigned long long) nonces) * PLOT_SIZE;
#ifdef HAVE_FALLOCATE
    printf("Using fallocate to expand file size to %lluGB\n", file_size/1024/1024/1024);
    ftruncate(ofd, 0);
    int ret = fallocate(ofd, FALLOC_FL_UNSHARE, 0, file_size);
    if (ret == -1) {
        printf("Failed to expand file to size %llu (errno %d - %s).\n", file_size, errno, strerror(errno));
        exit(-1);
    }
#elif defined(HAVE_POSIX_FALLOCATE)
    printf("Using posix_fallocate to expand file size to %lluGB\n", file_size/1024/1024/1024);
    ftruncate(ofd, 0);
    int ret = posix_fallocate(ofd, 0, file_size);
    if (ret == -1) {
        printf("Failed to expand file to size %llu (errno %d - %s).\n", file_size, errno, strerror(errno));
        exit(-1);
    }
#elif defined(__APPLE__)
    printf("Using fcntl::F_SETSIZE to expand file size to %lluGB\n", file_size/1024/1024/1024);
    unsigned long long result_size = file_size;
    int ret = fcntl(ofd, F_SETSIZE, &result_size);
      if(ret == -1) {
        printf("Failed set size %llu (errno %d - %s).\n", file_size, errno, strerror(errno));
        exit(-1);
    }
#else
    printf("Using ftruncate to expand file size to %lluGB\n", file_size/1024/1024/1024);
    ftruncate(ofd, file_size);
#endif