Re: 回复：Propose to remove support for CompactStrings off

[Stuart Marks]

>> I've written up a draft JEP for deprecating the disabling of Compact Strings. 
>> There hasn't been a good term for running the system with Compact Strings 
>> disabled, so I made up a term "UTF-16-only" and used it here.
>>
>> https://openjdk.org/jeps/8371379
>>
> This is deprecating something that I assume most developers have never heard of. 
> It's important that anyone reading the JEP will quickly see that this is not 
> deprecating String, it's not dropping UTF-16, and it's not changing the String 
> constructor that take a Charset. Instead it's all about JDK internal representation 
> of String. No change needed to my code. I think the JEP needs a clear call-to- 
> action:  Audit your application launch scripts and configuration to see if you are 
> using -XX:-CompactStrings. If you are, remove it, and re-test/re-benchmark to see if 
> see if there is any impact, preferably with a recent JDK release.

Good points about what the JEP should say. I've updated it.

Pretty much every article I've seen that describes Compact Strings also mentions the 
-XX:-CompactStrings option, so the option seems fairly well known. (In addition to 
it appearing in our documentation.) However, we don't know how many people actually 
*use* the option. I suspect there might be a long tail of conservative ("don't touch 
anything!") folks who added it a long time ago out of an abundance of caution and 
forgot about it, so it would be good to get the word out as widely as possible.

s'marks