Ethan Atkins f1698d2bf2 Re-use metabuild scala instance layer ... At some point I noticed that projects with no scala sources in the build loaded significantly faster than projects that had even a single scala file -- no matter how simple that file was. This didn't really make sense to me because *.sbt files _do_ have to be compiled. I finally realized that classloading was a likely bottle neck because *.sbt files are compiled on the sbt classpath while *.scala files are compiled with a different classloader generated by the classloader cache. It then occurred to me that we could pre-fill the classloader cache with the scala layer of the sbt metabuild classloader. I found that compared to 1.3.0-M5, a project with a simple scala file in the project directory loaded about 2 seconds faster after this change. Even if there are no scala sources in the build.sbt, there is a similar performance improvement for running "sbt compile", which I found exited 2-3 seconds faster after this change.		2019-06-06 21:02:24 -07:00
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src	Re-use metabuild scala instance layer	2019-06-06 21:02:24 -07:00