测量处理器运算能力 dhrystone

Dhrystone是测量处理器运算能力的最常见基准程序之一，常用于处理器的整型运算性能的测量。Dhrystone的计量单位为每秒计算多少次Dhrystone，后来把在VAX-11/780机器上的测试结果1757 Dhrystones/s定义为1 Dhrystone MIPS(百万条指令每秒)。但其也有许多不足，Dhrystone不仅不适合于作为嵌入式系统的测试向量，甚至在其大多数场合下都不适合进行应用。

安装 dhrystone：

apt install -y dhrystone

ICE-EVB 开发板测试：

dhrystone

在 ICE-EVB 开发板上运行结果如下：

Dhrystone Benchmark, Version 2.1 (Language: C)

Execution starts, 600000000 runs through Dhrystone
Execution ends

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]:    600000010
        should be:   Number_Of_Runs + 10
Ptr_Glob->
  Ptr_Comp:          481216
        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:          481216
        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:    0.1 
Dhrystones per Second:                      12329495.0

换算：

12329495/1757/1200=5.8 DMIPS/MHz