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Eliminating allocations. #1823

Merged
merged 14 commits into from Dec 31, 2012
Merged

Eliminating allocations. #1823

merged 14 commits into from Dec 31, 2012

Commits on Dec 27, 2012

  1. Eliminate allocations in ListBuffer. 

    ++= on a linear sequence can be accomplished without
closure allocation.
    @paulp
    paulp committed Dec 27, 2012
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  2. Eliminate allocations in ClassfileParser.

    @paulp
    paulp committed Dec 27, 2012
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  3. Eliminating more allocations in the collections.

    @paulp
    paulp committed Dec 27, 2012
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  4. Eliminating allocations in Codec.

    @paulp
    paulp committed Dec 27, 2012
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  5. Eliminating allocations in typeDepth.

    @paulp
    paulp committed Dec 27, 2012
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  6. Eliminate allocations in Growable.

    @paulp
    paulp committed Dec 27, 2012
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  7. Eliminate allocations in TypeMap.

    @paulp
    paulp committed Dec 27, 2012
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  8. Eliminate allocations in CPSAnnotationChecker.

    @paulp
    paulp committed Dec 27, 2012
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  9. Eliminate allocations in BaseTypeSeqs.

    @paulp
    paulp committed Dec 27, 2012
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  10. Eliminate allocations in uncurry and the backend.

    @paulp
    paulp committed Dec 27, 2012
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  11. Eliminate allocations in Trees.

    @paulp
    paulp committed Dec 27, 2012
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  12. Eliminate allocations in Specialize.

    @paulp
    paulp committed Dec 27, 2012
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  13. Eliminate allocations in Trees and Symbols.

    @paulp
    paulp committed Dec 27, 2012
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  14. Eliminate allocations in Types. 

    At this commit the statistics when compiling src/library
are as follows. These counts are precise, collected by a
modified Function1 which counts every instantiation of every
implementing class. The net result is 27 million fewer
allocations, over a 20% drop.

  // master (5b5635e), total and top five by count:
  Total Function1 allocations: 128,805,865

  scala.collection.immutable.$colon$colon 26781958
  scala.collection.mutable.ListBuffer 15365174
  scala.collection.TraversableLike$$anonfun$map$1 9127787
  scala.collection.generic.Growable$$anonfun$$plus$plus$eq$1 4636154
  scala.collection.mutable.StringBuilder 3531211

  // After these commits, total and top five by count:
  Total Function1 allocations: 101,865,721

  scala.collection.immutable.$colon$colon 26993704
  scala.collection.mutable.ListBuffer 15319656
  scala.collection.TraversableLike$$anonfun$map$1 7585019
  scala.reflect.internal.Types$MethodType$$anonfun$paramTypes$1 2447307
  scala.reflect.internal.Types$SubstSymMap 2436088
    @paulp
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