4 comments

• 

  Christopher Oezbek

  3 years ago

  Hi Elliot,
  could you add a little bit more information about which kind of tests you ran (how big was the program etc)? It is especially troubling to compare such small runs (4 seconds?), because then a bigger start-up overhead might ruin your whole comparison.
  
  Also there are some problems with the presentation of the data:
  
  * Why are the red and green boxes culmulative in the upper chart? In generall a histogram should not be used to present individual data points. The box plot is much better.
  * A good labeling would explain that the black graph belongs to Java 5 and that the red one to Java 2.
  * Data is not a good way to represent a dimension ("MFlops high is better" makes a better label).
  * Maybe you can add individual data-points to the boxplot and explain the individual lines and tails better.
  
  Thanks,
  Christopher
  reply
• 

  Elliott Back

  3 years ago

  Chris, I'm not sure why you're asking these generally good questions so out of context. I ran the java port of linpack I found--see link above--and recorded the times. The times are measured *after* startup, by the linpack program itself, which should be obvious if you realized what I was measuring by reading the above.
  
  The presentation of the data is minimal--you can figure it out. It was just a quick test, my friend...
  reply
• 

  Christopher Oezbek

  3 years ago

  Hi Elliot,
  good. I had mistaken the output data for plain 'java ...' runs that you started a couple of times from the console.
  
  The main motivation for these question was the fact, that I am working in an empirical software engineering department and those little omissions and imprecisions can make all the difference there is for an empirical result.
  
  Cheers and thanks for the results, :-)
  Christopher
  reply
• 

  Abhi

  1 year ago

  hey elliot,
  thts a nice comparison.....n practical too.
  i ve got a query....i was preparing for sun certified java programmer (SCJP)
  frm 2 months...n i was looking for 1.5 , but my company wud re-emburse the const for 1.4 only...so ..to d surrprise ive 2 give scjp 1.4 now....can u provide me any link tht clearly specificies d difference bet both in already existing
  apis or shud i just go n give test ..considering both work d same way (programatically)..! thanks in advance.
  reply