Shulou(Shulou.com)06/03 Report--

In this issue, the editor will bring you about the performance difference between Scala2.10 and 2.9.2. The article is rich in content and analyzes and describes it from a professional point of view. I hope you can get something after reading this article.

I have read some of the new features of Scala 2.10.0-RC3, and the most interesting thing about this version is the performance improvement. I was curious about the extent of the improvement, so I did a benchmark test. Here are the code for my two tests:

Eratosthenes screening

Def eratosthenes (toNum: Int) = {def sieveHelp (r: IndexedSeq [Int]): Stream [Int] = {if (r.isEmpty) Stream.empty else r.head #:: sieveHelp (r.tail.filterNot (_% r.head = = 0))} sieveHelp (2 +: (3 to toNum by 2))}

Sundaram screening

Def sundaram (toNum: Int) = {val n = (toNum-2) / 2 val nonPrimes = for (I

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