On Sun, 30 Jun 2013 07:50:31 -0700 (PDT)
> Thanks for the update, Mark.
> Just gave 0.12.4 a spin with a multi-project build on Fedora 18 with Scala
> 2.10.2 and Java 1.7.0_04
> On first compilation was horribly slow, and then subsequent compilations
> were about 50% slower than the previous. Basically takes 3 clean/compile
> cycles to get to blazing fast cached compilation on 0.12.4, whereas (I
> believe) 0.12.3 only took 2 clean/compiles to warm up the cache.
> Anyway, once warmed up 0.12.4 is as fast or faster than 0.12.3.
This is somewhat surprising because there weren't big changes and I would expect the opposite result due to the the class loader fix. Can you verify that you used the 0.12.4 launcher? Also, was each compilation a clean and then compile?
> Have yet to check out incremental compilation improvements, seemed pretty
> good on 0.12.3, sub projects mitigate most of the "scala is slow" stigma
> (for me at any rate).
The incremental compilation related fixes were for degenerate cases. There weren't general algorithmic improvements. Those come in 0.13.0. You won't seen an improvement in 0.12.4 unless your code hit one of these bugs that were fixed.
There was a fix for class loading unrelated to incremental compilation, but that should have produced the opposite result.
> Thanks for putting in the hard yards, development in Scala would be a mess
> without SBT.
> On Thursday, June 27, 2013 5:52:34 PM UTC+2, Mark Harrah wrote:
> > sbt 0.12.4 is now available. This release has two primary purposes:
> > backport cache and incremental compiler fixes from 0.13 and provide better
> > support for cross-building of plugins for 0.13. Details on the latter are
> > in 0.13 related announcements.
> > See the Changes page and the v0.12.4 commit list for details. This
> > release is intended to be binary and source compatible with 0.12.x. Use it
> > in an existing 0.12 project by setting sbt.version=0.12.4 in
> > project/build.properties. There is a new launcher, which includes some
> > important fixes. No changes should be necessary to your project definition
> > and all plugins published for 0.12.x should still work.
> > Thanks,
> > Mark
> >  http://www.scala-sbt.org/0.12.4/docs/Community/Changes.html
> >  https://github.com/sbt/sbt/commits/v0.12.4
> > 
> > http://repo.typesafe.com/typesafe/ivy-releases/org.scala-sbt/sbt-launch/0.12.4/sbt-launch.jar
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