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2021-04-02 22:25:02 → crestfallen joins (~john@128.32.176.159)
2021-04-02 22:27:17 <justsomeguy> Heh, you just gave me the idea to write a hang-man style game for type signatures.
2021-04-02 22:28:16 <justsomeguy> ...but I'll probably never actually write it, since I'm lazy (not the good kind) and bad at programming.
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2021-04-02 22:56:09 <sim590> Is there a pointfree notation equivalent of this: (\ x y -> return $ x + y) ? I struggle to formulate it. For example: (return . (+)).
2021-04-02 22:56:13 <sim590> Doesn't work
2021-04-02 22:57:05 <hololeap> sim590: `liftM2 (+)` or `liftA2 (+)`
2021-04-02 22:57:13 <hololeap> oh, no nvm
2021-04-02 22:58:20 <sim590> @pl (\ x y -> return $ x + y)
2021-04-02 22:58:20 <lambdabot> (return .) . (+)
2021-04-02 22:58:25 <sim590> hmmmm
2021-04-02 22:58:37 <sim590> I just found out about @pl.
2021-04-02 22:59:07 <hololeap> although, methinks you writing things awkwardly if you have a pure function that has a Monad constraint
2021-04-02 22:59:29 → ep1ctetus joins (~epictetus@ip72-194-215-136.sb.sd.cox.net)
2021-04-02 23:01:10 <sim590> hololeap: It's complicated.
2021-04-02 23:01:13 → heatsink joins (~heatsink@108-201-191-115.lightspeed.sntcca.sbcglobal.net)
2021-04-02 23:01:49 <hololeap> honestly (\x y -> return (x+y)) is quite readable and the pointfree version is overly obfuscating
2021-04-02 23:02:05 <dcbdan> how about: curry (return . uncurry (+))
2021-04-02 23:02:24 <sim590> hololeap: yeah. I agree. I was just wondering about what I was doing wrong for making it happen.
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2021-04-02 23:02:57 → nighmi joins (~felix@46.183.103.8)
2021-04-02 23:03:34 <hololeap> the rule of thumb is, don't lift things into a Monad for as long as possible
2021-04-02 23:03:58 <hololeap> it just adds unnecessary constraints to functions that could be used elsewhere
2021-04-02 23:04:09 <sim590> hololeap: If you're curious, I have a project which implements a Left Binary Search Tree: http://ix.io/2URe and all the functions on this data type take a BSPComputer which is a function that takes two nodes and executes inside the ChronicleT monad which takes care of logging for the sake of keeping the code easier to debug when there are wrong behaviour added to the code.
2021-04-02 23:05:06 → codygman__ joins (~user@47.186.207.161)
2021-04-02 23:05:43 <sim590> BSPcomputer is the function which computes the parent of two nodes because in this data structure, all internal nodes are computed and not set.
2021-04-02 23:05:58 <ja> i have a Data.Map and i call splitRoot three times to obtain 4 chunks that i operate on with monad-par, but somehow that is slower than doing it in one go
2021-04-02 23:06:26 <ja> the map has 5000 elements and with monad-par it takes 25 sec
2021-04-02 23:06:40 <ja> and without parallelization it takes 5 sec
2021-04-02 23:07:01 <ja> if it takes so long, surely it cant be the overhead of setting up threads that bogs it down
2021-04-02 23:07:26 <ja> the splitRoot should be constant time, so i really don't understand how it can take so much longer...
2021-04-02 23:08:11 <hololeap> ja, what's the operation?
2021-04-02 23:08:53 <ja> the operation is just filtering on ByteStrings inside the members, using ByteString.isInfixOf or the stringsearch package
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2021-04-02 23:10:11 <hololeap> well the first question is, did you compile it with --threaded and run it with `+RTS -N4` (or however many cores you have)
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2021-04-02 23:10:16 <L29Ah> bgamari_: have you tested the hyborg thing on ghc master?
2021-04-02 23:10:39 <ja> hololeap: i just use -N and not the numeral, let me look up if that is right
2021-04-02 23:10:58 <hololeap> yeah that uses the maximum number of cores that GHC detects
2021-04-02 23:11:13 <monochrom> -N without a number automagically uses your # of cores for the number.
2021-04-02 23:11:14 <hololeap> or the runtime, rather
2021-04-02 23:14:38 <hololeap> the overhead is small, and it sounds like the operation is chunky enough to work well with parallelization, so i don't know why it would slow it down so much. maybe it's a GC thing
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2021-04-02 23:17:23 <hololeap> you could use ekg or other profiling tools to debug it. ultimately you might want to read the book that was mentioned earlier since it explains all the details and shows examples of how to profile your application
2021-04-02 23:18:05 <L29Ah> ja: are you sure your map chunks are evaluated before you give them out to your workers?
2021-04-02 23:18:11 × nut quits (~user@roc37-h01-176-170-197-243.dsl.sta.abo.bbox.fr) (Ping timeout: 260 seconds)
2021-04-02 23:19:36 <ja> L29Ah: i use Data.IntMap.Strict , but i guess that is no guarantee that the map chunks are evaluated hmmm
2021-04-02 23:19:57 <hololeap> that's what deepseq's for
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2021-04-02 23:20:55 <ja> hololeap: all right, i guess i must buy that book , thanks for the tips
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2021-04-02 23:45:08 <bgamari_> L29Ah, not yet
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2021-04-02 23:45:15 <bgamari_> L29Ah, was dealing with 9.2 things today
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