Java8字符串重复数据删除和jruby

Java8字符串重复数据删除和jruby - 没有影响？(Java8 string deduplication and jruby - no effect?)

我正在尝试java8字符串重复数据删除，遗憾的是我无法创建一个jruby程序，它可以演示如何启用java重复数据删除也有助于jruby（1.7.19）。

问题：

jruby是否利用java8字符串重复数据删除？ jruby有一个特殊的选择吗？

是否有一个示例程序来显示如何使用-J-XX:+UseStringDeduplication运行jruby -J-XX:+UseStringDeduplication比没有此选项的jruby更好？

I'm experimenting with java8 string deduplication and sadly I'm unable to create a jruby program which can demonstrate how enabling java deduplication also helps jruby (1.7.19).

Questions:

Does jruby take advantage of java8 string deduplication? Is there a special option for jruby for this?

Is there an example program to show how jruby running with -J-XX:+UseStringDeduplication is better than jruby without this option?

最满意答案

JRuby的（Ruby）String（ org.jruby.RubyString实例）对象与java.lang.String不同...因此重复数据删除不会对Ruby Strings产生影响。 org.jruby.util.ByteList （Ruby String internals）的内部表示形式为byte[]而重复数据删除适用于char[]数组（Java String的内部）。

在JRuby上没有特殊的标志，它仍然可能会产生一些影响，因为String实例（虽然大多数是为Ruby方法名称实例化）在内部使用 - 如果没有尝试就很难分辨多少（但如果实际上它可能被认为很多）一个bug）。

JRuby's (Ruby) String (instances of org.jruby.RubyString) objects are different from java.lang.String ... thus the deduplication won't have effect on your Ruby Strings. The internal representation of org.jruby.util.ByteList (Ruby String internals) is byte[] while the de-duplication works on char[] arrays (internals of a Java String).

there's no special flag for this on JRuby, it still might have some effect since String instances (although mostly interned e.g. for Ruby method names) are used internally - how much it's hard to tell without trying (but if it's actually much it might be considered a bug).