Oh, right! Mentioning python in the list docs seems like it might help. Robby
On Sat, Feb 2, 2019 at 8:45 AM Sam Tobin-Hochstadt <sa...@cs.indiana.edu> wrote: > Fortunately there are already libraries with good performance on these > operations for Racket, so we could point to the data/ralist library, > for example. > > Sam > > On Sat, Feb 2, 2019 at 9:38 AM Robby Findler > <ro...@eecs.northwestern.edu> wrote: > > > > Lists seem like a common pitfall here, due to the overlap in terminology > but not functionality/performance. Maybe the right thing is to add a > library to data/<something> that is the python list data structure and > point to it from the list documentation? > > > > Robby > > > > On Sat, Feb 2, 2019 at 12:28 AM Alex Harsanyi <alexharsa...@gmail.com> > wrote: > >> > >> Someone asked recently for help on Reddit[1] with a Racket performance > issue. > >> The problem was they they were constructing a large list by appending > many > >> short lists repeatedly; their code was calling `(set! result (append > result > >> shortList))` in a loop and this was slow (unsurprisingly.) > >> > >> While trying to help them out, it occurred to me that this person was > perhaps > >> translating a program from Python to Racket, maybe to evaluate Racket. > The > >> problem is that list-append operations are efficient in Python, but the > >> natural corresponding choice in Racket, the `append` function, is not. > I > >> wonder how many people are in a similar situation, where they try to > convert a > >> Python program to Racket, see that the performance is bad, and conclude > that > >> Racket is slow -- Every time Racket is mentioned on Reddit or HN there > is at > >> least one person mentioning that Racket is slow and sadly they may even > have > >> their own data to prove it. > >> > >> Given the recent discussion in this group about promoting Racket, I am > >> wondering what can we do to help this category of people? These might > be > >> persons who never ask for help in any forum, after all the Racket > >> documentation is good enough to help anyone who is willing to read it. > >> > >> One improvement that I can think of is to add a performance description > to > >> each function that operates on the basic data structures (lists, > vectors, > >> hash-tables) > >> > >> What do others think? > >> Alex. > >> > >> [1]: > https://www.reddit.com/r/Racket/comments/am5r2w/how_to_read_a_file_linebyline_efficiently/ > >> > >> -- > >> 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. > -- 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.
