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Ethan Atkins
a368bf7026
I noticed that for a simple spark project that evaluating the test task was faster than running run when both tasks evaluated the same code block. I tracked this down to the BackgroundJobService.copyClasspath method. This method was hashing the jar contents of all of the files in the build. On my computer, this took 600ms (for context, the total run time of the `run` task was around 1.2 seconds, which included about 150ms of scala compiling and 350ms of time in the main method). If instead we use the last modified time it drops down to 5-10ms. As predicted, the total runtime of `run` in this project dropped down to 600ms which was on par with `test`. I am not sure why a hash was used rather than last modified in the first place, so I reworked things in such a way that, by default, sbt will use a hash but if turbo mode is on, it will use the last modified instead. We can revisit the default later.
sbt
sbt is a build tool for Scala, Java, and more.
For general documentation, see http://www.scala-sbt.org/.
sbt 1.x
This is the 1.x series of sbt. The source code of sbt is split across several GitHub repositories, including this one.
- sbt/io hosts
sbt.iomodule. - sbt/util hosts a collection of internally used modules.
- sbt/librarymanagement hosts
sbt.librarymanagementmodule that wraps Ivy. - sbt/zinc hosts Zinc, an incremental compiler for Scala.
- sbt/sbt, this repository hosts modules that implements the build tool.
Other links
- Setup: Describes getting started with the latest binary release.
- FAQ: Explains how to get help and more.
- sbt/sbt-zero-seven: hosts sbt 0.7.7 and earlier versions
Issues and Pull Requests
Please read CONTRIBUTING carefully before opening a GitHub Issue.
The short version: try searching or asking on StackOverflow.
license
See LICENSE.