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2020-09-23 12:20:55 × eric_ quits (~eric@2804:431:c7d4:b4fa:173:5d88:9ad1:a8df) (Ping timeout: 272 seconds)
2020-09-23 12:20:58 <lyxia> so you should also share your benchmarking code to make it clear whether that's what you're doing
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2020-09-23 12:28:28 <frdg> From Database.Persist: `update :: PersistEntity val => Key val -> [Update val] -> m ()` I am having trouble understanding the syntax for the `[Update val]` field.
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2020-09-23 12:30:47 <AlexM84> thanks lyxia, it does makes sense. I don't have benchmarking code written for it, it's just that I was doing it in ghci with +s set, but I guess ghci is not really effective way of doing this as it is just an interpreter. Compiling the code and applying indexJ for the second time gives an instant result, though
2020-09-23 12:31:10 <frdg> the function is described as `Update individual fields on a specific record.` But I do not understand how the val from Key val and Update val could be the same type.
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2020-09-23 12:34:39 <jackdk> They aren't. What is Key, and what is Update?
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2020-09-23 12:37:53 <frdg> key and update are the types
2020-09-23 12:38:51 <frdg> but wouldn't the val in `Key val` and `Update val` be the same val?
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2020-09-23 12:41:34 <lyxia> AlexM84: even if you're writing it by hand in ghci it's code you write to measure the performance of something, that's benchmarking code, and it's always worth sharing!
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2020-09-23 12:42:22 × Dolly quits (585fd1fd@ti0203q160-5312.bb.online.no) (Remote host closed the connection)
2020-09-23 12:42:37 <frdg> jackdk: I figured it out.
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2020-09-23 12:42:49 <jackdk> frdg: cool
2020-09-23 12:43:45 <dminuoso> AlexM84: Indeed, measuring performance with optimizations disabled can tell you a lot. Sometimes GHC is able to compensate for badly written code, but that should never be relied on. :)
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2020-09-23 12:44:04 <dminuoso> Algorithmic complexity should in general not depend on optimizations
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2020-09-23 12:47:45 <AlexM84> lyxia, dminuoso: thanks for suggestions, I've added the line of code I used in ghci to test this out into the gist I shared earlier
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2020-09-23 12:48:41 <AlexM84> I wonder if it's possible to force ghci not to rebuild the tree if it's accessed subsequently for indexing
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2020-09-23 12:49:38 <ahri> I have a stack project and I want to start using GHCJS, I've got a (probably) working binary via some nix magic (that I don't really understand and don't want to jump into that rabbit hole just now) - so now I want to build my project with stack/cabal and tell them to use the (global) GHCJS binary as the compiler - I have tried to read the docs and
2020-09-23 12:49:38 <ahri> search around but it's really not clear to me how I can achieve this last step - any help?
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2020-09-23 13:03:19 <sshine> ahri, for Stack it seems you want 'system-ghc: true' in case your GHCJS is the system GHC. https://stackoverflow.com/questions/44460120/haskell-stack-doesnt-use-system-ghc
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2020-09-23 13:04:16 <sshine> ahri, but my guess is you'll run into deeper problems here because of this comment: Note that stack can only use a system GHC installation if its version is compatible with the configuration of the current project, particularly the resolver setting.
2020-09-23 13:04:33 <sshine> and I'm guessing GHCJS doesn't have a valid Stackage resolver :)
2020-09-23 13:04:44 pierrot_ is now known as pierrot
2020-09-23 13:04:49 <sshine> but I could be wrong... I don't think Stack + GHCJS is a common combo.
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2020-09-23 13:05:18 <ahri> no I was wondering about that, I can give it a resolver for the corresponding GHC version this GHCJS is based on, but I have no idea whether that will work
2020-09-23 13:05:41 <sshine> ahri, did you try with cabal yet? since cabal doesn't try to manage GHC, it should gladly pick whatever GHC you've got.
2020-09-23 13:06:05 <ahri> not yet, I'm not sure how to tell it to to use my GHCJS binary
2020-09-23 13:06:09 <sshine> probably not gonna work well... isn't GHCJS a very old GHC?
2020-09-23 13:06:27 <sshine> what happens if you just run cabal? it uses the wrong GHC?
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2020-09-23 13:07:00 × AlexM84 quits (a108e98a@161.8.233.138) (Remote host closed the connection)
2020-09-23 13:07:02 <sshine> ahri, have you considered looking for a template for your GHCJS project? some of this configuration could come for free.
2020-09-23 13:07:15 <ahri> the ghcjs binary is called "ghcjs" so I don't know how it would even look for that
2020-09-23 13:07:20 <sshine> OK.
2020-09-23 13:07:30 <ahri> as for its age, I have ghcjs based on ghc 8.6.2 so it's not bad
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