RFR: 8358533: Improve performance of java.io.Reader.readAllLines [v9]

[Brian Burkhalter]

On Tue, 1 Jul 2025 01:37:27 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

> I think resizing the buffer when the line length exceeds cb.length/2 will be more efficient (cpu wise).

I concur. I missed that this had been changed in the most recent commit.

> test/jdk/java/io/Reader/ReadAll.java line 117:
> 
>> 115:             sb.setLength(0);
>> 116:         }
>> 117: 
> 
> Does one of these cases result in a *very very long line without a terminator"; something that would trigger the limits of ArraySupport.newLength at or near Integer.MAX_VALUE -  8?

I don't know, but I doubt it. I will look into adding something.

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/25863#discussion_r2177863145
PR Review Comment: https://git.openjdk.org/jdk/pull/25863#discussion_r2177863858