I'm intrigued, but I don't know exactly what you mean. On Thursday, 12 May 2016 16:25:05 UTC-7, James Reeves wrote: > > Have you considered defining specific indexes? For instance, if you know > ahead of time that you want to search for entities that have both position > and velocity, you could define an index that keys both of those values. > > - James > > > > On 12 May 2016 at 23:50, JvJ <kfjwh...@gmail.com <javascript:>> wrote: > >> Maybe this is a little off-topic, but on the general topic of >> performance, other than just numerical performance, what's the best way to >> get information/advice on how to improve it. >> >> I went about doing these tests (and other tests) because I'm trying to >> create a game scripting framework in clojure, which I want to build around >> an entity-component-system architecture. Entities are maps of >> components, and system functions are defined to sort of "pattern match" >> against >> entities to see if they have the required components. (i.e. an >> update-position function would add velocity to position, so it only applies >> to entities >> with both a position and a velocity component). >> >> The first step in this process is to find a way to store these so that it >> would be as fast as possible to iterate over "all entities with this set of >> components", >> while avoiding things like filter operations. >> >> I started off by making cross-map <https://github.com/JvJ/cross-map>, >> which cross-indexes any entries with keys of the form [r c], where r is a >> row and c is a column, and allows O(1) access >> of entire rows and columns. >> >> Still, though, the performance tests >> <https://github.com/JvJ/cross-map/blob/master/test/cross_map/perf.cljc> >> aren't what I expected they would be, and I'm wondering how to go about >> dealing with that. >> >> Again, this isn't strictly about numerical performance, but it's why I'm >> doing these kinds of tests in the first place. >> >> Thanks. >> >> On Thursday, 12 May 2016 15:23:07 UTC-7, raould wrote: >>> >>> On Thu, May 12, 2016 at 3:11 PM, Nicola Mometto <brob...@gmail.com> >>> wrote: >>> > Fair enough, but in this case types wouldn't really have helped: the >>> author did use `Double` type hints, mistakenly assuming that would make its >>> code use primitive types, which it does not since `Double` is boxed and not >>> primitive. >>> > Clojure already has compile time warnings about boxed math that >>> would've helped in this case if turned on, without any need for types: try >>> compiling OP's code after running `(set! *unchecked-math* :warn-on-boxed)` >>> >>> Thanks for the details re: double. Apologies for being annoyed/ing. >>> >>> Next up: something like `(set! *unchecked-laziness* :warn-on-lazy)? We >>> can relive the ignominious history of "$!" in Haskell. >>> >> -- >> You received this message because you are subscribed to the Google >> Groups "Clojure" group. >> To post to this group, send email to clo...@googlegroups.com >> <javascript:> >> Note that posts from new members are moderated - please be patient with >> your first post. >> To unsubscribe from this group, send email to >> clojure+u...@googlegroups.com <javascript:> >> For more options, visit this group at >> http://groups.google.com/group/clojure?hl=en >> --- >> You received this message because you are subscribed to the Google Groups >> "Clojure" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to clojure+u...@googlegroups.com <javascript:>. >> For more options, visit https://groups.google.com/d/optout. >> > >
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