Add benchmarks to compare recursive and flat cp representations

The goal of these changes is to add possibility to:
- compare an efficiency and a content of both cp implementations
(ClassPathImplComparator)
- examine the memory consumption by creating a lot of globals using
a specified classpath (ClassPathMemoryConsumptionTester) - it can be
considered as e.g. some approximation of ScalaPresentationCompilers
in Scala IDE when working with many projects

ClassPathMemoryConsumptionTester is placed in main (I mean not test)
sources so thanks to that it has properly, out of the box configured
boot classpath etc. and it's easy to use it, e.g.:

scala scala.tools.nsc.ClassPathMemoryConsumptionTester
-YclasspathImpl:<implementation_to_test> -cp <some_cp>
-sourcepath <some_sp> -requiredInstances 50 SomeFileToCompile.scala

At the end it waits for the "exit" command so there can be used some
profiler like JProfiler to look how the given implementation behaves.

Also flat classpath implementation is set as a default one to test it
on Jenkins. This particular change must be reverted when all tests
will pass because for now it's not desirable to make it permanently
the default representation.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/compiler/scala/tools/nsc/settings/ScalaSettings.scala b/src/compiler/scala/tools/nsc/settings/ScalaSettings.scala
index 18e639b81c..c599b7b443 100644
--- a/src/compiler/scala/tools/nsc/settings/ScalaSettings.scala
+++ b/src/compiler/scala/tools/nsc/settings/ScalaSettings.scala
@@ -202,7 +202,7 @@ trait ScalaSettings extends AbsScalaSettings
   val YmethodInfer    = BooleanSetting    ("-Yinfer-argument-types", "Infer types for arguments of overriden methods.")
   val etaExpandKeepsStar = BooleanSetting ("-Yeta-expand-keeps-star", "Eta-expand varargs methods to T* rather than Seq[T].  This is a temporary option to ease transition.").withDeprecationMessage(removalIn212)
   val inferByName     = BooleanSetting    ("-Yinfer-by-name", "Allow inference of by-name types. This is a temporary option to ease transition. See SI-7899.").withDeprecationMessage(removalIn212)
-  val YclasspathImpl  = ChoiceSetting     ("-YclasspathImpl", "implementation", "Choose classpath scanning method.", List(ClassPathRepresentationType.Recursive, ClassPathRepresentationType.Flat), ClassPathRepresentationType.Recursive)
+  val YclasspathImpl  = ChoiceSetting     ("-YclasspathImpl", "implementation", "Choose classpath scanning method.", List(ClassPathRepresentationType.Recursive, ClassPathRepresentationType.Flat), ClassPathRepresentationType.Flat)
   val YdisableFlatCpCaching  = BooleanSetting    ("-YdisableFlatCpCaching", "Do not cache flat classpath representation of classpath elements from jars across compiler instances.")
 
   val YvirtClasses    = false // too embryonic to even expose as a -Y //BooleanSetting    ("-Yvirtual-classes", "Support virtual classes")