Dhrystone Testing on Cortex A9: disabling Prints increases the DMIPS.

i am seeing an issue while doing Dhrystone test. i am using Dhrstone source code of version 2.1.

when i run this source code on LINUX platform, i got DMIPS/MHz =1.6

but there are some printing commands that prints variables used, when i disable them i got DMIPS/MHz=1.8

but these printing commands are after taking END TIME Measurements. but why so these are affecting the TIME measurement.

these are print commands

printf ("Final values of the variables used in the benchmark:\n");

  printf ("\n");

  printf ("Int_Glob:            %d\n", Int_Glob);

  printf ("        should be:   %d\n", 5);

  printf ("Bool_Glob:           %d\n", Bool_Glob);

  printf ("        should be:   %d\n", 1);

  printf ("Ch_1_Glob:           %c\n", Ch_1_Glob);

  printf ("        should be:   %c\n", 'A');

  printf ("Ch_2_Glob:           %c\n", Ch_2_Glob);

  printf ("        should be:   %c\n", 'B');

  printf ("Arr_1_Glob[8]:       %d\n", Arr_1_Glob[8]);

  printf ("        should be:   %d\n", 7);

  printf ("Arr_2_Glob[8][7]:    %d\n", Arr_2_Glob[8][7]);

  printf ("        should be:   Number_Of_Runs + 10\n");

  printf ("Ptr_Glob->\n");

  printf ("  Ptr_Comp:          %d\n", (int) Ptr_Glob->Ptr_Comp);

  printf ("        should be:   (implementation-dependent)\n");

  printf ("  Discr:             %d\n", Ptr_Glob->Discr);

  printf ("        should be:   %d\n", 0);

  printf ("  Enum_Comp:         %d\n", Ptr_Glob->variant.var_1.Enum_Comp);

  printf ("        should be:   %d\n", 2);

  printf ("  Int_Comp:          %d\n", Ptr_Glob->variant.var_1.Int_Comp);

  printf ("        should be:   %d\n", 17);

  printf ("  Str_Comp:          %s\n", Ptr_Glob->variant.var_1.Str_Comp);

  printf ("        should be:   DHRYSTONE PROGRAM, SOME STRING\n");

  printf ("Next_Ptr_Glob->\n");

  printf ("  Ptr_Comp:          %d\n", (int) Next_Ptr_Glob->Ptr_Comp);

  printf ("        should be:   (implementation-dependent), same as above\n");

  printf ("  Discr:             %d\n", Next_Ptr_Glob->Discr);

  printf ("        should be:   %d\n", 0);

  printf ("  Enum_Comp:         %d\n", Next_Ptr_Glob->variant.var_1.Enum_Comp);

  printf ("        should be:   %d\n", 1);

  printf ("  Int_Comp:          %d\n", Next_Ptr_Glob->variant.var_1.Int_Comp);

  printf ("        should be:   %d\n", 18);

  printf ("  Str_Comp:          %s\n",

                                Next_Ptr_Glob->variant.var_1.Str_Comp);

  printf ("        should be:   DHRYSTONE PROGRAM, SOME STRING\n");

  printf ("Int_1_Loc:           %d\n", Int_1_Loc);

  printf ("        should be:   %d\n", 5);

  printf ("Int_2_Loc:           %d\n", Int_2_Loc);

  printf ("        should be:   %d\n", 13);

  printf ("Int_3_Loc:           %d\n", Int_3_Loc);

  printf ("        should be:   %d\n", 7);

  printf ("Enum_Loc:            %d\n", Enum_Loc);

  printf ("        should be:   %d\n", 1);

  printf ("Str_1_Loc:           %s\n", Str_1_Loc);

  printf ("        should be:   DHRYSTONE PROGRAM, 1'ST STRING\n");

  printf ("Str_2_Loc:           %s\n", Str_2_Loc);

  printf ("        should be:   DHRYSTONE PROGRAM, 2'ND STRING\n");

  printf ("\n");