Dhrystone DMIPS跑分原理以及CPU&NPU等效算力分析

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已于 2023-08-12 14:45:06 修改 · 置顶 · 5.1k 阅读

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#DMIPS #dhrystone #ARM #benchmark

于 2022-04-16 19:43:40 首次发布

本文详细介绍了Dhrystone基准测试在Cortex-A7平台上的运行过程和结果，探讨了DMIPS的计算方式及与主频的关系，并分析了DMIPS与TFOPS之间的等效换算。通过对不同编译器和注册变量的测试，揭示了编译器对性能的影响。此外，文章还讨论了向量机与标量机的性能差异以及ARMV7与ARMV8的SIMD寄存器区别，提供了处理器性能评估的深入理解。

下载dhrystone，编译，排错，再编译，再排错，编译PASS，一顿操作之后，dhrystone成功被移植到某款Cortex-A7平台，主频跑1.2G HZ的情况下，测试结果如下：

msh />dhrystone
 
Dhrystone Benchmark, Version 2.1 (Language: C)
 
Program compiled without 'register' attribute
 
Please give the number of runs through the benchmark: 
Execution starts, 100000000 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]:    100000010
        should be:   Number_Of_Runs + 10
Ptr_Glob->
  Ptr_Comp:          -1029845352
        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:          -1029845352
        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:    0.4 
Dhrystones per Second:                      2777777.8

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