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Java8字符串重复数据删除和jruby - 没有影响？

[英]Java8 string deduplication and jruby - no effect?

原文 2015-03-28 22:28:02 0 1 java/ jruby

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). 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）。

Questions: 问题：

Does jruby take advantage of java8 string deduplication? jruby是否利用java8字符串重复数据删除？ Is there a special option for jruby for this? jruby有一个特殊的选择吗？
Is there an example program to show how jruby running with -J-XX:+UseStringDeduplication is better than jruby without this option? 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？

1 个解决方案

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. 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。 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). org.jruby.util.ByteList （Ruby String internals）的内部表示是byte[]而重复数据删除适用于char[]数组（Java String的内部）。

there's no special flag for this on JRuby, it still might have some effect since String instances (although mostly interned eg 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). 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（尽管大多数实例化为例如Ruby方法名称）在内部使用 - 如果不尝试就很难分辨多少（但如果真的很多，可能会考虑它一个bug）。