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2021-05-10 13:00:40 <siers> it typechecked [a] -> b against a -> Int
2021-05-10 13:00:55 <tomsmeding> you can try using parList but I believe that will just create N sparks where N is the length of the list; that may work but it might be more efficient to explicitly split it into a number of jobs that is equal to the number of processors you have
2021-05-10 13:01:08 <tomsmeding> depending on the runtime system performance
2021-05-10 13:01:52 <dminuoso> pagnol: Compile everything with profiling, and then use `+RTC -xc` ?
2021-05-10 13:02:11 <tomsmeding> siers: well your ($|| parList rseq) can take any value of type ([a] -> b) for any a and b, and the argument you're giving it, 'tl', has type c -> Int for any c. So c ~ [a] and b ~ Int and it unifies?
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2021-05-10 13:03:03 <siers> yikes, you're right
2021-05-10 13:03:23 <tomsmeding> (just talking about types, not about what anything of this means)
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2021-05-10 13:06:06 <siers> parInNThreads might work
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2021-05-10 13:21:06 <pagnol> I just wasted 4 hours because I assumed cabal retrieves the most recent version of a package if no version contraint is specified
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2021-05-10 13:22:44 <tomsmeding> siers: I also wrote this at some point: https://paste.tomsmeding.com/dFmuEgZ7
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2021-05-10 13:23:15 <tomsmeding> it uses explicit (haskell-)threads using forkIO in order to be a bit more deterministic (in my experience)
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2021-05-10 13:23:50 <tomsmeding> if you don't understand what the (a -> b) projection function is for, just pass 'id'
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2021-05-10 13:24:20 <tomsmeding> also note that it explicitly uses one _less_ than getNumCapabilities because in my experience, using all doesn't work and blocks some of the threads from even spawning
2021-05-10 13:25:09 <siers> what does the projection function do? :)
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2021-05-10 13:26:35 <tomsmeding> it allows you to evaluate a _component_ of the structure
2021-05-10 13:26:57 <tomsmeding> e.g. by passing 'fst', you can have of list of pairs where you evaluate the first components in parallel, not touching the second components at all
2021-05-10 13:27:05 <siers> ah
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2021-05-10 13:27:33 <tomsmeding> 'parSeq b f l' is equivalent to 'parSeq b id (map f l)' I think
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2021-05-10 13:35:03 <dminuoso> pagnol: it does.
2021-05-10 13:35:16 <siers> tomsmeding, are sparks cooperative?
2021-05-10 13:35:25 <dminuoso> pagnol: or rather, the most recent version for which cabal can find a suitable build plan, according to all existing constraints.
2021-05-10 13:36:30 <tomsmeding> siers: I _think_ sparks and forkIO threads are both cooperative, but only at point where they allocate -- so if you have a busy loop on unboxed values that doesn't allocate anything, you might block the thread
2021-05-10 13:36:36 <tomsmeding> but don't take my word for it
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2021-05-10 13:37:54 <siers> should parallel work in ghci -threaded -with-rtsopts='-N8'?
2021-05-10 13:38:00 <siers> or must I compile it?
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2021-05-10 13:48:57 hackage mnist-idx-conduit 0.1.0.0 - conduit utilities for MNIST IDX files https://hackage.haskell.org/package/mnist-idx-conduit-0.1.0.0 (ocramz)
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2021-05-10 13:59:27 hackage mnist-idx-conduit 0.2.0.0 - conduit utilities for MNIST IDX files https://hackage.haskell.org/package/mnist-idx-conduit-0.2.0.0 (ocramz)
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2021-05-10 14:01:10 <pagnol> dminuoso: what you're saying seems to be at odds with my most recent experience, but it's possible there's something I'm missing
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2021-05-10 14:01:27 hackage pseudo-boolean 0.1.10.0 - Reading/Writing OPB/WBO files used in pseudo boolean competition https://hackage.haskell.org/package/pseudo-boolean-0.1.10.0 (MasahiroSakai)
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2021-05-10 14:11:06 <dminuoso> pagnol: Feel free to present an example here or at an issue tracker, should have one.
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2021-05-10 14:15:19 <tomsmeding> pagnol: at the very least the claim relies on you having run 'cabal update' recently
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2021-05-10 14:16:49 <dminuoso> Of course, there could be the odd example of where downgrading `foo` would allow cabal to use newer versions of other packages..
2021-05-10 14:17:14 <dminuoso> But cabal cant find that out, because it doesn't actually do an exhaustive search of all combinations
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