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    we are a little same , my assignment is to compare or1200 ,arm7,arm9 's
performance and toolchain.
and i study electronic engineering ,but not familiar with CPU and linux .

where is the executed.log ,i didn't find the file.and would mind mail me the
scripts you used to count instrunctions to
penguin00@m...,thank you very much.

  or1ksim use about 4 times cylces compare to arm7,it is an unecceptable
slow result. i guess because the or1ksim is not a cycle accurate
simulator,and don't simulate the 5 stage pipeline ,so it instert many nops.
i think, so if i use verilog simulate the nops instruntion maybe fewer ,
then the cycle used is fewer . I just guess so ,and will test verilog
simulation soon.

Dimitri?s Orfanos wrote:
> 
> Oh, and something else. I am not a maintainer of this project but I've 
> involved because of my university has put me an assignment(actually a 
> master thesis). So by reading the code of the or1ksim0.2.0 I have 
> concluded that there is no good measuring of cycles so I've done 
> something else. I've set on my own some CPI(clocks per instruction) and 
> with little scripting I can see which commands are executed (from the 
> executed.log) and how many times these commands are executed and I 
> calculate the total cycles of my own. For example I've set that the 
> "l.and" command uses 1 cycle if with my little script sees that there 
> are 3 "l.and" I measure 3*1 total cycles. The simulator uses a scheduler 
> which every n cycles tries to communicate with virtual devices that are 
> defined in the sim.cfg like keyboard, uart, etc . These cycles are also 
> added in the simulation cycles, so there is not so accurate. If you want 
> to use the simulator for cycle counting do something similar with me 
> make a little script and count the commands from the executed.log . If 
> you just want to use the simulator to run programs then you don't need 
> to count cycles.
> DO
> 
> yueng wrote:
>> I change the sim.cfg , mem read and write both delay 1.
>> i run jpeg decode in the or1ksim
>> the result is 
>> 310,200,242 cycles, 171,816,396 instructions
>> compare with arm7 it use only 56,000,000 cycle, and 40,000,000
>> instructions
>>
>> i remember that i read or1ksim is about 90% cycle accurate somewhere,
>> same jpeg decode C code ,why or1ksim use so many instructions? and so
>> many
>> cycles.
>>
>>
>> thank you
>>   
> _______________________________________________
> http://www.opencores.org/mailman/listinfo/openrisc
> 
> 

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