RFR: 8368633: (fs) Path.toRealPath(NOFOLLOW_LINKS) very slow on macOS

[Brian Burkhalter]

On Wed, 8 Oct 2025 23:59:53 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

> Try to avoid checking file keys for all entries by first attempting `Path.compareTo` and `String.equalsIgnoreCase`.

The most recent version (5412b62) is the fastest per the micro-benchmark:

Benchmark                  Mode  Cnt    Score   Error   Units
ToRealPath.noFollowLinks  thrpt    5  120.930 ± 9.330   ops/s (master)

ToRealPath.noFollowLinks  thrpt    5  432.650 ± 20.343  ops/s (commit dff9776)

ToRealPath.noFollowLinks  thrpt    5  455.693 ± 23.291  ops/s (commit 5412b62)

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

PR Comment: https://git.openjdk.org/jdk/pull/27709#issuecomment-3392528421