Quite right, I think. 3 things are important (in my experience):
Most important: the algorithm. For example I once made a fully vectorized program for shortest paths that was much slower than a simpler non-vectorized program, simply because my algorithm was not efficient. Second: appropiate use of input and output facilies (although to me this nowadays seems less important) Third: putting much effort in speed can be useful only if this effort does not exceed the loss of time and money to produce the speed up. Of course this depends on how many times the program will be used. Mho, Jos -----Original Message----- From: racket-users@googlegroups.com [mailto:racket-users@googlegroups.com] On Behalf Of Matthias Felleisen Sent: lunes, 06 de abril de 2015 19:11 To: Lux Cc: racket-users@googlegroups.com Subject: Re: [racket-users] How to find most efficient constructs/instructions beside benchmarking? You almost never have to worry about the efficiency of (second x) (cadr x) and (car (cdr x)). There are always bigger fish to fry than that. On Apr 6, 2015, at 3:37 AM, Lux <glsdes...@gmail.com> wrote: > It is more efficient (second myList) or (car (cdr myList)) if it is any difference at all? > What are the principles I can keep in mind when I try to make code as efficient as possible? Some basic functions are implemented in C in the language. They are necessarily more fast to simple abstractions/helpers (in Racket) based on them that can be reimplemented easily without requiring libraries like racket/list in addition lo save memory and load times? > I know readable code is generally better, but how can I save some fractions of seconds here and there changing my constructs? > > Lux > > -- > You received this message because you are subscribed to the Google Groups "Racket Users" group. > To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
