[erlang-questions] benchmarks game harsh criticism

Bengt Kleberg <>
Fri Nov 30 10:20:37 CET 2007


greetings,

thanks for the answer. i especially appreciate that you will not harass 
me and instead make it easy for me. that is good because it really feels 
uncomfortable to be the target of your normal email writing.


quotes from "Timing Trials, or, the Trials of Timing" as per request:
"* Memory-related issues and the effects of memory hierarchies are 
pervasive: how memory is managed, from hardware caches to garbage 
collection, can change runtimes dramatically. Yet users have no direct 
control over most aspects of memory management. "

"We started to construct a table with three dimensions: task, 
programming language, and machine. Eventually we added the size of the 
problem solved by the program as a fourth dimension, and we changed the 
presentation from tables to graphs. Varying the problem size helped us 
to detect unusual runtime effects, while a graphical presentation 
highlights patterns and trends in runtime instead of individual 
performance scores."

"We designed tests whose runtime should grow linearly with the size of 
the problem: runtime = mÂ?size + b. Thus, if we choose size to be large 
enough to justify ignoring the fixed overhead (b), the log-log plot 
should show a straight line of unit slope. Exceptions indicate anomalous 
behavior that deserves further attention."


Now it is your turn. could you quote the exact words where they say that 
4 inputs and a spread of x10 is good enough?


bengt
Those were the days...
    EPO guidelines 1978: "If the contribution to the known art resides
    solely in a computer program then the subject matter is not
    patentable in whatever manner it may be presented in the claims."


On 11/28/07 19:20, Isaac Gouy wrote:
> --- Bengt Kleberg <> wrote:
> -snip-
>> however, at this time i really would like for you, Isaac Gouy, to do 
>> more work when it comes to answering emails in this thread. it is not
>> pressing, take your time, but i have one outstanding question that i 
>> would appreciate if you answered so that i may move on with the rest.
> 
> 
> When you asked a meta-question 
> 
>>> what does this question have to do with the subject matter of this
>>> discussion?
> 
> and ignored all parts of my post that directly addressed what you read
> into Kernighan and Van Wyk, it seemed to me you did not want to discuss
> the comments you had made, and it wasn't so important to me that I
> would harass you until you answered.
> 
> 
> I'll make it easy for you - the question has nothing to do with the
> subject matter of this discussion - it's an aside.
> 
> 
> I asked that you quote the exact words where "kvw recommends
> investigating" a wide spectrum of inputs.
> 
> 
> 
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