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07:59 bartbes: hello
07:59 bartbes: I've been having a problem with drracket on arch linux lately
08:00 bartbes: namely this error on startup: "png_structp->C: expected argument of type <non-null `png_structp' pointer>; given #f", any ideas on how to solve this?
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09:13 jamessan: bartbes: is Arch using libpng15 now instead of libpng12?
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09:25 bartbes: finally I tracked down what pinged me
09:25 bartbes: sorry for the delay ;)
09:26 bartbes: jamessan: it is
09:26 jamessan: that's the problem :) it's been fixed in git
09:27 bartbes: is that going to be released anytime soon? and if not, is it easily backportable?
09:28 jamessan: there was supposed to be a release a week or two ago but it was delayed until the next release cycle to clean some stuff up
09:28 jamessan: the patch is pretty small though if you wanted to backport it
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09:29 jamessan: https://github.com/plt/racket/commit/466ffadb12c5488e65ccf95170c41cd224b2ca8f
09:29 rudybot: http://tinyurl.com/72feuoa
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09:30 bartbes: alright, thanks for the help
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09:40 bartbes: oh, one thing, when's the next release cycle?
09:48 bartbes: btw, I imagine development on this has to be terrible, a clean compile took me over an hour (of course I was doing other stuff in the mean time, so that didn't help, but still)
09:50 jamessan: well, you can do parallel builds.  make -j 4  or whatever would be appropriate for your system
09:50 jamessan: August is the planned date for the next release
09:52 jamessan: http://thread.gmane.org/gmane.comp.lang.racket.user/11846
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10:04 bartbes: well, I fixed my problem by building and installing libpng12
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13:00 RacketCommitBot: [racket] plt pushed 3 new commits to master: http://git.io/kC0Beg
13:00 RacketCommitBot: [racket/master] racket/gui: fix some concurrency problems `text%' - Matthew Flatt
13:00 RacketCommitBot: [racket/master] racket/draw: add `#:eventspace' argument to `open-output-text-editor' - Matthew Flatt
13:00 RacketCommitBot: [racket/master] try libpng15 before libpng12 - Matthew Flatt
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15:36 offby1: wandering through the "Ruby Koans".  It sure seems ... weird and arbitrary.
15:36 offby1: I'm writing a lot of "WTF" comments.
15:39 ssbr: hahaha
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15:57 bremner: isn't that the thing about Koans?
15:58 offby1: er, yes: the "Ruby Koans" is indeed about Koans.
15:58 offby1 glances around nervously.
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15:59 jamessan: pretty sure bremner was referring to koans generally elicit a "WTF?"
15:59 bremner: rudybot: you know what to do. the bottle at the back of the medicine cabinet.
15:59 rudybot: bremner: The only sponsor I've got is the one keeping me out of the liquor cabinet.
16:01 offby1: jamessan: ah.
16:01 offby1 is enlightened
16:02 jamessan: mu!
16:08 offby1: Your nick makes me think of Irish whiskey
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16:19 jamessan: :)
16:19 Cryovat: Wondering about performance
16:19 Cryovat watches everyone scuttle out of the room
16:20 eli: ?
16:20 Cryovat: Will allocating a lot of cons cells cause repeated GC calls?
16:20 eli: Yes, and if you don't hold on to them it will release them too.
16:20 Cryovat: I'm trying to use Racket for a little game/OpenGL project, trying to find out what things I should avoid doing 60 times per second ;)
16:21 eli: The GC is in general not something you should avoid doing 60 times per second.
16:21 eli: It works very well with allocation+freeing of small structures.
16:22 Cryovat: I meant that I'm making it run at a fixed 60 fps step
16:22 eli: So it's best to do what you should do in any language: write the code as usual and make it readable, then optimize things if/when needed.
16:23 eli: (Yeah, I got that.)
16:24 Cryovat: I looked at the gl-world code on PLaneT, it seemed to advocate a style where a new state value is generated per frame
16:24 Cryovat: From a design perspective, that seems like the most elegant thing to do, but want to try to avoid things that can turn things into a slideshow
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16:28 eli: Cryovat: If you do things functionally, the thing is that most of these structures are shared anyway.
16:29 eli: This means that in practice you allocate much less than you'd think.
16:29 eli: And again, it's best to start with good code and not prematurely optimize it before you know the speeds that are involved.
16:30 Cryovat: That's very true
16:30 Cryovat: Thanks
16:31 Cryovat: I'll stop getting hung up on this and try to get some pixels on screen instead :)
16:31 eli: Cryovat: Here's a quick experiment:
16:31 eli: (define c 0)
16:31 eli: (define (foo) (let loop () (set! c (+ c 1)) (loop)))
16:31 eli: (begin (set! c 0) (let ([th (thread foo)]) (sleep 20) (kill-thread th) (quotient c 20)))
16:31 eli: This runs the increment in a tight loop and returns the number of iterations per second.
16:31 eli: I'm getting a number around 180M.
16:32 eli: Then, I use: (define (foo) (let loop () (set! c (+ c (car (cons 1 2)))) (loop)))
16:32 eli: This is the same, except that it allocates a single cons.
16:32 eli: The result is 17.5M iterations per second.
16:33 eli: With (set! c (+ c (car (list 1 2 3 4 5)))) it goes down to 12M.
16:34 eli: So you can see that the effect is not as drastic as you'd think.
16:34 eli: It's a toy example, obviously, but there's a long way from 10M down to 60.
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16:35 Cryovat: Ah, that's very comforting to know :)
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16:36 Cryovat: On a completely unrelated note, I love DrRacket
16:37 Cryovat: Seems to strike the perfect balance between power and minimalism
16:48 ozzloy: i'm trying to test out broadcast udp packets.   here's my writer http://pastebin.com/UuWYLJDS here's my listener http://pastebin.com/iRtFBskm
16:53 ozzloy: never mind, i have to go
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