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sbt, the interactive build tool
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Jason Zaugg 5005abfef2 SD-232 Recycle classloaders to be anti-hostile to JIT. 
The compiler interface subclasses `scala.tools.nsc.Global`,
and loading this new subclass before each `compile` task forces
HotSpot JIT to deoptimize larges swathes of compiled code. It's
a bit like SBT has rigged the dice to always descend the longest
ladder in a game of Snakes and Ladders.

The slowdown seems to be larger with Scala 2.12. There are a number
of variables at play, but I think the main factor here is that
we now rely on JIT to devirtualize calls to final methods in traits
whereas we used to emit static calls. JIT does a good job at this,
so long as classloading doesn't undo that good work.

This commit extends the existing `ClassLoaderCache` to encompass
the classloader that includes the compiler interface JAR. I've
resorted to adding a var to `AnalyzingCompiler` to inject the
dependency to get the cache to the spot I need it without binary
incompatible changes to the intervening method signatures.
 		2016-09-26 14:49:47 +10:00
cache scalariform changed this. 2016-04-05 22:52:05 -04:00
compile SD-232 Recycle classloaders to be anti-hostile to JIT. 2016-09-26 14:49:47 +10:00
interface Fixes test 2016-04-06 11:26:17 -04:00
ivy Explicit list of artifacts for Scala binary version check. Fixes #2701 2016-08-19 17:44:19 +01:00
launch Include sbt-ivy-snapshots to launchconfig 2015-12-29 19:48:57 -05:00
licenses move remaining pieces of sbt subproject to sbt_pending and fix notices 2010-09-21 21:55:50 -04:00
main SD-232 Recycle classloaders to be anti-hostile to JIT. 2016-09-26 14:49:47 +10:00
notes notes 2016-09-16 02:46:24 -04:00
project Add sbt-pgp, required by publishSigned in release-sbt 2016-09-22 16:42:54 +01:00
run Fix additional warnings 2015-08-07 00:23:14 +02:00
sbt Merge pull request #2742 from eed3si9n/wip/early2 2016-09-15 11:22:16 +01:00
sbt-maven-resolver/src Support wildcard exclusions in maven resolver 2016-09-02 12:20:22 +01:00
scripted Continue to run tests after passing pending test 2015-08-19 08:26:21 +02:00
src/main/conscript Bump version in launchconfig to 0.13.13-RC2 2016-09-22 16:43:10 +01:00
tasks Fixes #2302. Don't check pre and post conditions in sbt.Execute by default. 2015-12-07 22:14:55 +01:00
testing Replace procedure syntax by explicit Unit annotation 2015-08-04 10:07:38 +02:00
util SD-232 Recycle classloaders to be anti-hostile to JIT. 2016-09-26 14:49:47 +10:00
.gitattributes Added .gitattributes file. 2013-04-25 00:06:51 +08:00
.gitignore support defining Projects in .sbt files 2012-12-09 20:40:41 -05:00
.java-version jEnv 2016-09-14 20:09:25 -04:00
.travis.yml Adds a scripted test that tests repo override 2016-04-24 14:24:05 -04:00
CONTRIBUTING.md CONTRIBUTING.md: Fix error in scripted test command 2016-01-23 17:39:17 +01:00
LICENSE Update CONTRIBUTING.md 2014-04-14 12:16:06 -04:00
NOTICE Update CONTRIBUTING.md 2014-04-14 12:16:06 -04:00
README.md Fix intended formatting in README. 2015-05-27 07:33:26 +01:00
api.specification Macro def aware recompilation. 2012-03-04 17:35:51 +01:00
build.sbt straighten up dependencies 2016-08-22 18:20:32 -04:00
scripted.specification New scripted test framework 2009-11-09 09:34:52 -05:00

README.md

sbt

sbt is a build tool for Scala, Java, and more.

For general documentation, see http://www.scala-sbt.org/.

Issues and Pull Requests

Please read CONTRIBUTING carefully before opening a GitHub Issue.

The short version: try StackOverflow and sbt-dev. Don't open an Issue.

sbt 0.13

This is the 0.13.x series of sbt.

  • Setup: Describes getting started with the latest binary release.
  • FAQ: Explains how to get help and more.
  • Google Code: hosts sbt 0.7.7 and earlier versions

license

See LICENSE.