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Scala Meetup WarmUp: 2.12.x慢了？

 7 years ago
source link: https://zhuanlan.zhihu.com/p/44317356?
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Scala Meetup WarmUp: 2.12.x慢了？

《Scala实用指南》译者，TeXmacs开发者

Scala 2.12.x 比 2.11.x 的编译速度快了不少，但是实测发现Scala 2.12.x变慢了。

sbt clean 'project benchmark' 'set scalaVersion := "2.11.12"' 'jmh:run -f 1 -i 20 -wi 20 -t 1 Richards'
[info] Benchmark      Mode  Cnt     Score    Error  Units
[info] Richards.run  thrpt   20  7464.953 ± 65.303  ops/s

sbt clean 'project benchmark' 'set scalaVersion := "2.12.6"' 'jmh:run -f 1 -i 20 -wi 20 -t 1 Richards'
[info] Benchmark      Mode  Cnt     Score    Error  Units
[info] Richards.run  thrpt   20  6623.674 ± 51.901  ops/s

在这个评测中，2.11.x的吞吐大约是2.12.x吞吐的1.1倍。

依据 https://github.com/scala/scala-dev/issues/81

我们需要在Scala 2.12.x 中使用这两个编译参数，提升所生成字节码的性能：

  • -opt:l:inline
  • -opt-inline-from 
sbt clean 'project benchmark' 'set scalaVersion := "2.12.6"' 'set scalacOptions in ThisBuild ++= Seq("-opt:l:inline", "-opt-inline-from")' 'jmh:run -f 1 -i 20 -wi 20 -t 1 Richards'
[info] Benchmark      Mode  Cnt     Score    Error  Units
[info] Richards.run  thrpt   20  7456.257 ± 23.585  ops/s

评测代码见：sadhen/scala-benchmark-starter

更多细节大家可以参与我们的 Meetup 讨论哦！

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