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???
05/05/09 08:26
Modified:
  05/05/09 08:32
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 		 #165061 - Dhrystone?
Responding to: ???'s previous message
The value of Dhrystone as a benchmark in small embedded systems is dubious. That benchmark concentrates on moving huge chunks of data around and performing 32-bit arithmetics on them. That's almost exactly what a typical small microcontroller never needs to do.

http://www.8052.com/forum/read/152983

Personal view, arguable.

JW

[edit] Oh yes, and then Dhrystone is a combined benchmark of the processor AND the compiler. Without significant help from the compiler, many of the enhancements would simply not be utilised. I fail to find on the mentioned website, WHICH compiler was used to produce the above result. With careful hand-coding of Dhrystone in asm, I assume at least a 2x gain over any C compiler could be achieved, for example. With using a stock compiler which is not aware of dual DPTR and the arithmetic coprocessor and other enhanced features of the given core, it's not likely (although not impossible) that the performance increase would exceed 12.
[/edit]


List of 74 messages in thread
TopicAuthorDate
max clk freq            01/01/70 00:00      
   Which            01/01/70 00:00      
   300MHz            01/01/70 00:00      
      .            01/01/70 00:00      
         Does that make it effectively 600MHz, then...?            01/01/70 00:00      
            That are the links I found...            01/01/70 00:00      
               Interesting item, but did you notice ... ?            01/01/70 00:00      
                  300Mips, equivalent to 3.6GHz!            01/01/70 00:00      
                     That's slightly misleading ...            01/01/70 00:00      
                        You sure about your math?            01/01/70 00:00      
                           It's confusing ... typical marketing drivel            01/01/70 00:00      
                              Based on the claims you posted            01/01/70 00:00      
                                 Those aren't my claims!            01/01/70 00:00      
                                    Read comments _before_ (not) answering them            01/01/70 00:00      
                                       Architecture speed            01/01/70 00:00      
                                          That was my take too            01/01/70 00:00      
                                             Of course, it does not depend on CLK frequency!            01/01/70 00:00      
                              I cannot see a confusion            01/01/70 00:00      
                                 Not all one-clocker mfg's make the same claims            01/01/70 00:00      
                                    But...            01/01/70 00:00      
                                 comparison of 12- and less-clockers            01/01/70 00:00      
                                    Very nice!            01/01/70 00:00      
                                    Cool!            01/01/70 00:00      
                                    Good overview            01/01/70 00:00      
               Another link            01/01/70 00:00      
                  Dhrystone?            01/01/70 00:00      
                     Yes ... one could argue that the core is hobbled            01/01/70 00:00      
                        to sell IS useful... ;-)            01/01/70 00:00      
                     Dhrystone            01/01/70 00:00      
                        give data            01/01/70 00:00      
                  I find it useful...            01/01/70 00:00      
                     Nonsense            01/01/70 00:00      
                        Nice attitude...            01/01/70 00:00      
                        One thing that would be useful for FPGA            01/01/70 00:00      
                           Still waiting            01/01/70 00:00      
                              Here it is ... It's simple arithmetic            01/01/70 00:00      
                                 Not at all!            01/01/70 00:00      
                                 You missed the "at the same frequency" part            01/01/70 00:00      
                                    You're right, in a sense ...            01/01/70 00:00      
                                       Still thinking of the DT8051 as 12-clocker            01/01/70 00:00      
                                          Gee ... I can see where I went off the track!            01/01/70 00:00      
                                             You deserve respect for that...            01/01/70 00:00      
                                             Very easy to miss things            01/01/70 00:00      
                                                It is a shame the documentation is so superficial            01/01/70 00:00      
                                             Marketing demagogy            01/01/70 00:00      
                                                baloney            01/01/70 00:00      
                                                   Insignificant?            01/01/70 00:00      
                                                      the "classical" timing            01/01/70 00:00      
                                                         Fair claim            01/01/70 00:00      
                                                Not so fast, there, Pilgrim...            01/01/70 00:00      
                                                   Any alternative?            01/01/70 00:00      
                                                      Possibly ... ???            01/01/70 00:00      
                                                         Still pipelining            01/01/70 00:00      
                                                            It doesn't have to pipeline            01/01/70 00:00      
                                                               What use?            01/01/70 00:00      
                                                                  if critical, lock - if you can            01/01/70 00:00      
                                                                     What question?            01/01/70 00:00      
                                                                        Whatever happened to Amit Mittal ?            01/01/70 00:00      
                                                                           maximum speed of a car            01/01/70 00:00      
                                                                           Pigeon Poster?            01/01/70 00:00      
                                                                        no question, uncernity            01/01/70 00:00      
                                                                  It's not that difficult ...            01/01/70 00:00      
                                                                     Are we talking about the same thing?            01/01/70 00:00      
                                                                        It is a matter of how you choose to view things            01/01/70 00:00      
                                                                           Q still open: any 8051 with only two clock transitions?            01/01/70 00:00      
                                                                              I do not believe bigger is better ...            01/01/70 00:00      
                                                                                 You argue quite much for not caring            01/01/70 00:00      
                                                                                    Without going into too much detail ...            01/01/70 00:00      
                                                                                       Pipeline for concurrency            01/01/70 00:00      
                                                                                          One step at a time            01/01/70 00:00      
                                                                                             Many steps at the same time            01/01/70 00:00      
                                                                              1-clocker without pipelining            01/01/70 00:00      
                                                                                 Interesting link - I just wish it was a bit meatier            01/01/70 00:00      
   what the datasheet for the particular device states            01/01/70 00:00      

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