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propensive's profile
Jon Pretty
Jon Pretty
Jon Pretty
@propensive

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Jon Pretty

@propensive

Supporting Scala through professional training and open-source software. Responsible for Magnolia, Fury, Scala World and Functional Africa.

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propensive.com
Joined July 2010

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    1. Alex Archambault‏ @alxarchambault 30 Nov 2017

      Kind of benchmark of sbt-coursier against default sbt 1 resolution. Run it locally, and tell us your results!https://github.com/alexarchambault/coursier-benchmark …

      7 replies 3 retweets 12 likes
    2. Jon Pretty‏ @propensive 30 Nov 2017
      Replying to @alxarchambault @heathercmiller

      I'm sure @alxarchambault knows this, but basically every Ivy resolution with SBT seems to involve a 302 redirect to another 302 which leads to a 404, for a couple of resolvers before getting a 200. Those 302s and 404s (as per protocol) don't get cached.

      1 reply 0 retweets 0 likes
    3. Alex Archambault‏ @alxarchambault 30 Nov 2017
      Replying to @propensive @heathercmiller

      Only one repository (Central) should be involved in the benchmark project, which should limit these kind of failed attempts. That said, I haven't checked whether sbt checks other repositories too here (might be good to ensure that it doesn't).

      2 replies 0 retweets 0 likes
    4. Jon Pretty‏ @propensive 30 Nov 2017
      Replying to @alxarchambault @heathercmiller

      I was trying to improve downloads at Scala World, so with a "default" configuration, I ran SBT through a proxy server, and noticed about 6 HTTP requests to various repositories (e.g. typesafe) before fetching most files. I think this is typical.

      1 reply 0 retweets 1 like
    5. Nicolas Rinaudo‏ @NicolasRinaudo 30 Nov 2017
      Replying to @propensive @alxarchambault @heathercmiller

      Isn't that just the order your resolvers are declared in though?

      1 reply 0 retweets 0 likes
    6. Alex Archambault‏ @alxarchambault 30 Nov 2017
      Replying to @NicolasRinaudo @propensive @heathercmiller

      There are more repositories for plugins for sure. I re-order them in sbt-coursier, to avoid those that feel slow (https://github.com/coursier/coursier/blob/06322622188f2e458b15204e05f4cefa99321df3/sbt-coursier/src/main/scala/coursier/Tasks.scala#L101 …).

      1 reply 0 retweets 1 like
      Jon Pretty‏ @propensive 30 Nov 2017
      Replying to @alxarchambault @NicolasRinaudo @heathercmiller

      Reordering seems worthwhile. Though IIRC (I don't have it set up any more) the default settings search the Typesafe repo for every file prior to Maven Central, which just adds a fraction of a second to each dependency, because only a few files actually exist on Typesafe.

      7:04 AM - 30 Nov 2017 from East Worldham, England
      1 reply 0 retweets 0 likes
        1. New conversation
        1. Alex Archambault‏ @alxarchambault 30 Nov 2017
          Replying to @propensive @NicolasRinaudo @heathercmiller

          Yeah, but that only applies to plugins then (the benchmark here is ok).

          1 reply 0 retweets 0 likes
        2. Jon Pretty‏ @propensive 30 Nov 2017
          Replying to @alxarchambault @NicolasRinaudo @heathercmiller

          Ok. You probably know how weak my understanding of SBT is, so I'm not sure exactly what we going on ;) but I can report that an HTTP proxy (eg Squid) is a reasonable way to inspect what's happening at the HTTP layer.

          1 reply 0 retweets 0 likes
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