Dhrystone

The Dhrystone example ( dhrystone directory) is a classic benchmark for testing CPU performance. When you run this application, it performs dhrystone benchmark testing and displays messages and results on a UART terminal.

Newlib

By default, newlib-nano is used for this demo.

See also

User Debug Configuration - To learn more about User Debug Configuration.

Execution Sequence:

When user run the application, it displays information similar to the following in a terminal:

Dhrystone Benchmark, Version C, Version 2.2
Program compiled without 'register' attribute
Using CLINT, HZ=50000000
 
Trying 100 runs through Dhrystone:
Measured time too small to obtain meaningful results
 
Trying 1000 runs through Dhrystone:
Measured time too small to obtain meaningful results
 
Trying 10000 runs through Dhrystone:
Measured time too small to obtain meaningful results
 
Trying 100000 runs through Dhrystone:
Measured time too small to obtain meaningful results
 
Trying 1000000 runs through Dhrystone:
Final values of the variables used in the benchmark:
 
Int_Glob:            5
        should be:   5
Bool_Glob:           1
        should be:   1
Ch_1_Glob:           A
        should be:   A
Ch_2_Glob:           B
        should be:   B
Arr_1_Glob[8]:       7
        should be:   7
Arr_2_Glob[8][7]:    1111110
        should be:   Number_Of_Runs + 10
Ptr_Glob->
  Ptr_Comp:          38560
        should be:   (implementation-dependent)
  Discr:             0
        should be:   0
  Enum_Comp:         2
        should be:   2
  Int_Comp:          17
        should be:   17
  Str_Comp:          DHRYSTONE PROGRAM, SOME STRING
        should be:   DHRYSTONE PROGRAM, SOME STRING
Next_Ptr_Glob->
  Ptr_Comp:          38560
        should be:   (implementation-dependent), same as above
  Discr:             0
        should be:   0
  Enum_Comp:         1
        should be:   1
  Int_Comp:          18
        should be:   18
  Str_Comp:          DHRYSTONE PROGRAM, SOME STRING
        should be:   DHRYSTONE PROGRAM, SOME STRING
Int_1_Loc:           5
        should be:   5
Int_2_Loc:           13
        should be:   13
Int_3_Loc:           7
        should be:   7
Enum_Loc:            1
        should be:   1
Str_1_Loc:           DHRYSTONE PROGRAM, 1'ST STRING
        should be:   DHRYSTONE PROGRAM, 1'ST STRING
Str_2_Loc:           DHRYSTONE PROGRAM, 2'ND STRING
        should be:   DHRYSTONE PROGRAM, 2'ND STRING
 
Microseconds for one run through Dhrystone : 3.882
Dhrystones per Second : 257586.722
User_Time : 3.882s
Number_Of_Runs : 1000000
HZ : 50000000
DMIPS per Mhz:  1.46