使用播放SBT自动重载,编译时间极慢!和scala-js

Question

我遇到SBT问题.我的项目是这个的一个分支:https://github.com/vmunier/play-with-scalajs-example,目前几乎完全相同.我只添加了几行代码和导入的scalatags.

当我用sbt启动服务器时,我运行该项目,这需要很多时间.自动重载功能也是如此.对于代码的任何更改,我每次都在谈论2到3分钟.即使对于SBT,这也太慢了.

SBT版本0.13.0播放版本2.1 Scala版本2.9.1 scalatags版本2.10 scalajs 0.2.4

这是SBT控制台中的输出

    [info] Compiling 1 Scala source to /home/chobeat/git/2048-in-scala-js/scalajs/target/scala-2.10/classes...
[info] Preoptimizing /home/chobeat/git/2048-in-scala-js/scalajvm/public/javascripts/scalajs/scalajs-example-preopt.js ...
[warn] Referring to non-existent class scala_scalajs_test_JasmineTest
[warn] Referring to non-existent method example_test_ScalaJSExampleTest$.expect__Lscala_scalajs_js_Any__Lorg_scalajs_jasmine_JasmineExpectation
[warn]   called from example_test_ScalaJSExampleTest$$anonfun$1$$anonfun$apply$mcV$sp$1.apply$mcV$sp__V
[warn]   called from example_test_ScalaJSExampleTest$$anonfun$1$$anonfun$apply$mcV$sp$1.apply__V
[warn]   called from example_test_ScalaJSExampleTest$$anonfun$1$$anonfun$apply$mcV$sp$1.apply__O
[warn]   called from scala_Predef$.require__Z__Lscala_Function0__V
[warn]   called from scala_collection_Iterator$class.scala_collection_Iterator$class__copyToArray__Lscala_collection_Iterator__O__I__I__V
[warn]   called from scala_collection_AbstractIterator.copyToArray__O__I__I__V
[warn]   called from scala_collection_TraversableOnce$class.scala_collection_TraversableOnce$class__copyToArray__Lscala_collection_TraversableOnce__O__I__V
[warn]   called from scala_collection_AbstractTraversable.copyToArray__O__I__V
[warn]   called from scala_collection_TraversableOnce$class.scala_collection_TraversableOnce$class__toArray__Lscala_collection_TraversableOnce__Lscala_reflect_ClassTag__O
[warn]   called from scala_collection_AbstractTraversable.toArray__Lscala_reflect_ClassTag__O
[warn]   called from scala_collection_immutable_StringLike$class.scala_collection_immutable_StringLike$class__format__Lscala_collection_immutable_StringLike__Lscala_collection_Seq__T
[warn]   called from scala_collection_immutable_StringOps.format__Lscala_collection_Seq__T
[warn]   called from scala_collection_immutable_Range.description__p4__T
[warn]   called from scala_collection_immutable_Range.fail__p4__Lscala_Nothing
[warn]   called from scala_collection_immutable_Range.scala$collection$immutable$Range$$validateMaxLength__V
[warn]   called from scala_collection_immutable_Range.validateRangeBoundaries__Lscala_Function1__Z
[warn]   called from scala_collection_immutable_Range.foreach__Lscala_Function1__V
[warn]   called from scala_collection_TraversableOnce$class.scala_collection_TraversableOnce$class__foldLeft__Lscala_collection_TraversableOnce__O__Lscala_Function2__O
[warn]   called from scala_collection_AbstractTraversable.foldLeft__O__Lscala_Function2__O
[warn]   called from scala_collection_generic_TraversableForwarder$class.scala_collection_generic_TraversableForwarder$class__foldLeft__Lscala_collection_generic_TraversableForwarder__O__Lscala_Function2__O
[warn]   called from scala_collection_mutable_ListBuffer.foldLeft__O__Lscala_Function2__O
[warn]   called from scala_collection_immutable_ListSet$ListSetBuilder.result__Lscala_collection_immutable_ListSet
[warn]   called from scala_collection_immutable_ListSet$ListSetBuilder.result__O
[warn]   called from scala_collection_TraversableLike$class.scala_collection_TraversableLike$class__flatMap__Lscala_collection_TraversableLike__Lscala_Function1__Lscala_collection_generic_CanBuildFrom__O
[warn]   called from scala_collection_immutable_Stream.flatMap__Lscala_Function1__Lscala_collection_generic_CanBuildFrom__O
[warn]   called from scala_collection_immutable_Stream$StreamBuilder.result__Lscala_collection_immutable_Stream
[warn]   called from scala_collection_immutable_Stream$StreamBuilder.result__O
[warn]   called from scala_collection_generic_GenericCompanion.empty__Lscala_collection_GenTraversable
[warn]   called from scala_collection_generic_GenericSetTemplate$class.scala_collection_generic_GenericSetTemplate$class__empty__Lscala_collection_generic_GenericSetTemplate__Lscala_collection_GenSet
[warn]   called from scala_collection_AbstractSet.empty__Lscala_collection_GenSet
[warn]   called from scala_collection_immutable_Set$Set2.empty__Lscala_collection_Set
[warn]   called from scala_collection_SetLike$class.scala_collection_SetLike$class__newBuilder__Lscala_collection_SetLike__Lscala_collection_mutable_Builder
[warn]   called from scala_collection_AbstractSet.newBuilder__Lscala_collection_mutable_Builder
[warn]   called from scala_collection_IterableLike$class.scala_collection_IterableLike$class__take__Lscala_collection_IterableLike__I__O
[warn]   called from scala_collection_AbstractIterable.take__I__O
[warn]   called from scala_collection_mutable_ListBuffer.$$plus$plus$eq__Lscala_collection_TraversableOnce__Lscala_collection_mutable_ListBuffer
[warn]   called from scala_collection_mutable_ListBuffer.$$plus$plus$eq__Lscala_collection_TraversableOnce__Lscala_collection_generic_Growable
[warn]   called from scala_collection_TraversableOnce$class.scala_collection_TraversableOnce$class__to__Lscala_collection_TraversableOnce__Lscala_collection_generic_CanBuildFrom__O
[warn]   called from scala_collection_AbstractIterator.to__Lscala_collection_generic_CanBuildFrom__O
[warn]   called from scala_collection_TraversableOnce$class.scala_collection_TraversableOnce$class__toSet__Lscala_collection_TraversableOnce__Lscala_collection_immutable_Set
[warn]   called from scala_collection_AbstractTraversable.toSet__Lscala_collection_immutable_Set
[warn]   called from scala_runtime_ScalaRunTime$.init___
[warn]   called from scala_scalajs_js_JavaScriptException.hashCode__I
[warn]   called from java_lang_Object.toString__T
[warn]   called from scalajs-corejslib.js
[warn] involving instantiated classes:
[warn]   example_test_ScalaJSExampleTest$$anonfun$1$$anonfun$apply$mcV$sp$1
[warn]   scala_Predef$
[warn]   scala_collection_immutable_StreamIterator
[warn]   scala_collection_immutable_HashSet$HashSet1
[warn]   scala_collection_immutable_StringOps
[warn]   scala_collection_immutable_Range
[warn]   scala_collection_mutable_ListBuffer
[warn]     (already seen, not repeating call stack)
[warn]   scala_collection_immutable_ListSet$ListSetBuilder
[warn]     (already seen, not repeating call stack)
[warn]   scala_collection_immutable_Stream$Cons
[warn]     (already seen, not repeating call stack)
[warn]   scala_collection_immutable_Stream$StreamBuilder
[warn]   scala_collection_Traversable$
[warn]     (already seen, not repeating call stack)
[warn]   scala_collection_immutable_Set$Set2
[warn]     (already seen, not repeating call stack)
[warn]   scala_collection_Iterator$$anon$2
[warn]   scala_collection_immutable_Nil$
[warn]     (already seen, not repeating call stack)
[warn]   scala_scalajs_js_JavaScriptException
[warn]   java_lang_Object
[warn] Referring to non-existent method example_test_ScalaJSExampleTest$.describe__T__Lscala_Function0__V
[warn]   called from example_test_ScalaJSExampleTest$.init___
[warn]   exported to JavaScript with @JSExport
[warn] Referring to non-existent method example_test_ScalaJSExampleTest$.it__T__Lscala_Function0__V
[warn]   called from example_test_ScalaJSExampleTest$.init___
[warn]   exported to JavaScript with @JSExport

Answer 1

因为您使用的是 scalatags 和 scala-js，它们是编译器密集型库，所以当您修改需要更改的代码时，您的编译时间将比平常长得多。您可以采取一些措施来缓解这一问题，包括升级到最新版本的 Play (2.2.2)、sbt (0.13.1) 和 scala (2.10.3)，这些版本都在编译时间方面实现了性能改进。如果您尚未使用增量编译，我建议您这样做（play ~run 或 play ~test-quick）。另请检查您的内存限制（Xmx 和 MaxPermGen）以及您是否使用最新版本的 JDK（7 或 8）。

使用最新版本我能够得到这些时间：

“play test”编译了应用程序并进行了测试，并在 173 秒内运行了所有测试

编译完成后，“play run”需要 10 秒才能启动 Web 应用程序

编译完成后，“sbt run”需要 10 秒才能启动 Web 应用程序

“sbt 测试”需要 10-25 秒

“播放测试”需要10-17秒

清理后“sbt编译”大约需要20秒

这些时间是在 .sbtconfig 中的 SBT_OPTS="-Xmx2048m" 的 Macbook Pro Retina 上实现的