[Question] Dhrystone benchmark

[frdtgzu]

I am doing a comparison of a few softcore cpus (implementation space, difficulty of implementation/use, compute power/frequency capabilities), along with some additional tinkering with external peripherals. I was wondering if anyone has the dhrystone benchmark (or knows where i could get it) for the uppdated versions of this processor, as i noticed it was part of the sw-examples a few years ago (im not experienced with porting software to other platforms yet, nor am i farmiliar with this one at the moment)? Thanks :)

P.S if it's relevant, i am using the arty a7-100t (along with vivado)

[stnolting]

Hey @frdtgzu!

I prefer CoreMark for benchmarking - Dhrystone's code is just so... horrible. But that is just me. 😅

I think you could just try the latest NEORV32 port files: https://github.com/stnolting/neorv32/tree/v1.9.0/sw/example/dhrystone
These are the last results that I have obtained (for a rv32imc architecture):

NEORV32: Processor running at 100000000 Hz
NEORV32: Executing Dhrystone (10000 iterations). This may take some time...


Dhrystone Benchmark, Version 2.1 (Language: C)

Program compiled without 'register' attribute

Execution starts, 10000 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]:    10010
        should be:   Number_Of_Runs + 10
Ptr_Glob->
  Ptr_Comp:          2147483732
        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:          2147483732
        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: 13
Dhrystones per Second:                      72939

NEORV32: << DETAILED RESULTS (integer parts only) >>
NEORV32: Total cycles:      13710151
NEORV32: Cycles per second: 100000000
NEORV32: Total runs:        10000

NEORV32: DMIPS/s:           72939
NEORV32: DMIPS/s/MHz:       729

NEORV32: VAX DMIPS/s:       41
NEORV32: VAX DMIPS/s/MHz:   729/1757

Btw, do you think we should re-add the Dhrystone benchmark to this project? 🤔

[frdtgzu]

Warnings aside, i get this error, so its not even compile-ing.

[stnolting]

That's a compiler version issue. You need to add _zicsr to MARCH. For example make MARCH=rv32i_zicsr clean_all exe

[frdtgzu]

Okay progress, but new error now:

[stnolting]

Yeah, that function is deprecated. You can just remove that from dhry_1.c.

[frdtgzu]

Damn, true legend :D! Compiled now, no problem (beside the endless warnings 🥲 )

[I3ernhard]

Hi, I'm not able to run it like it is described in the Readme to get a bin file:
neorv32/sw/example/dhrystone$ make USER_FLAGS+=-DRUN_DHRYSTONE MARCH=rv32imc_zicsr_zifencei EFFORT=-O2 clean_all exe:

Thanks, BR Bernhard

[stnolting]

Hey @I3ernhard.

The processor's data memory is too small for this program so you need to increase the size. To increase the size in the linker script you can just add a symbol to your command (see 📚 3.2. Overriding the Default Configuration)

$ make USER_FLAGS+="-DRUN_DHRYSTONE -Wl,--defsym,__neorv32_ram_size=16k" MARCH=rv32imc_zicsr_zifencei EFFORT=-O2 clean_all exe

But this will just modify the linker script configuration (i.e. the "software side" of the memory configuration). You'll also need to adjust the core's physical memory size (see 📚 2. General Hardware Setup):

MEM_INT_DMEM_SIZE => 16*1024,

[stnolting]

FTR

The Dhrystone port is added back in #901.