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

[Roger Riggs]

On Tue, 1 Jul 2025 16:34:51 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

>> I don't know, but I doubt it. I will look into adding something.
>
> With this change
> 
> --- a/test/jdk/java/io/Reader/ReadAll.java
> +++ b/test/jdk/java/io/Reader/ReadAll.java
> @@ -115,6 +115,8 @@ public static void setup() throws IOException {
>              sb.setLength(0);
>          }
>  
> +        strings.add(" ".repeat(Integer.MAX_VALUE/2));
> +
> 
> the limit is reached but it doubles the test run time, at least on an M4 Max.

Yea, seems a waste to run it every time. I don't think we run any tests statistically *some of the time".
Maybe if it was limited to run only in *big* configurations, maybe a separate @run with:

`@requires os.maxMemory >= 6g`

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PR Review Comment: https://git.openjdk.org/jdk/pull/25863#discussion_r2178365431