Leonidas Tsampros wrote:
I'm pretty sure that a small difference in execution time does not mean
that the produced code is different.
Actually, execution time of a process is very sensitive to the
environment of this process. See for instance:
http://www-plan.cs.colorado.edu/diwan/asplos09.pdf
"We see that something external and orthogonal to the program,
i.e., changing the size (in bytes) of an unused environment variable,
can dramatically (frequently by about 33% and once by almost 300%)
change the performance of our program."
(The quotation is taken out of the article.)
I learned about this in a message from Xavier Leroy to the OCaml mailing
list:
http://caml.inria.fr/pub/ml-archives/caml-list/2009/12/e261eeb95bec6c5a2791335c84234a05.en.html
Cheers,
Michaël
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