RFR: 8367279: Test tools/javac/tree/TreePosTest.java timed out

[Adam Sotona]

On Wed, 17 Sep 2025 08:20:09 GMT, Jan Lahoda <jlahoda at openjdk.org> wrote:

> The `test/langtools/tools/javac/tree/TreePosTest.java` tries to parse all langtools tests, and started to time out recently in some cases. In the case of this test, we can try to use the `JavacTaskPool`, which pools and reuses javac instances, rather than creating (and initializing) a javac instance for each file. Given this test only parses the file, and even attributes them, this should be relatively safe.
> 
> Locally, I can't confirm too significant time improvements (before this change ~6s, after this change ~4s), but it might help on CI.

The patch improves test performance by 11% on my laptop.

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Marked as reviewed by asotona (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/27334#pullrequestreview-3266866123