[benchmark] Janitor Duty: Sweep III

[palimondo]

Clean up setup overhead in few Dictionary benchmarks.

[palimondo]

@swift-ci please benchmark

[swift-ci]

!!! Couldn't read commit file !!!

[palimondo]

@swift-ci please benchmark

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@swift-ci please smoke test

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@swift-ci please smoke test os x platform

[palimondo]

@swift-ci please clean smoke test os x platform

[palimondo]

@eeckstein: 😕 Should I re-adjust the DictionarySwapAtOfObjects legacyFactor.

[palimondo]

@swift-ci please benchmark

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@swift-ci please smoke test

[palimondo]

@swift-ci please benchmark

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@swift-ci please benchmark

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@swift-ci please smoke test

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@swift-ci please smoke test

[swift-ci]

Code size: -O

TEST	OLD	NEW	DELTA	RATIO
Regression
DictionaryRemove.o	14456	15848	+9.6%	0.91x
Improvement
DictionarySwap.o	21700	21330	-1.7%	1.02x

Performance: -Osize

TEST	OLD	NEW	DELTA	RATIO
Regression
NopDeinit	45000	48700	+8.2%	0.92x (?)

Code size: -Osize

TEST	OLD	NEW	DELTA	RATIO
Regression
DictionaryRemove.o	9741	11227	+15.3%	0.87x

Performance: -Onone

TEST	OLD	NEW	DELTA	RATIO
Regression
DictionarySwapAt	3584	3864	+7.8%	0.93x (?)

How to read the data

The tables contain differences in performance which are larger than 8% and differences in code size which are larger than 1%.

If you see any unexpected regressions, you should consider fixing the
regressions before you merge the PR.

Noise: Sometimes the performance results (not code size!) contain false
alarms. Unexpected regressions which are marked with '(?)' are probably noise.
If you see regressions which you cannot explain you can try to run the
benchmarks again. If regressions still show up, please consult with the
performance team (@eeckstein).

Hardware Overview

  Model Name: Mac Pro
  Model Identifier: MacPro6,1
  Processor Name: 12-Core Intel Xeon E5
  Processor Speed: 2.7 GHz
  Number of Processors: 1
  Total Number of Cores: 12
  L2 Cache (per Core): 256 KB
  L3 Cache: 30 MB
  Memory: 64 GB

[palimondo]

@swift-ci please smoke test Linux platform