Observation: The cost of using NIO BasicFileAttributes in ZipFile.Source.Key

[Eirik Bjørsnøs]

On Mon, Jan 26, 2026 at 6:07 PM Eirik Bjørsnøs <eirbjo at gmail.com> wrote:


> For reference, "java -cp hello.jar Hello" runs in ~62 ms on the mainline.
> On a branch using a non-NIO "file key" API, it runs in ~58.
> So startup impact is significant.
>

Interestingly, this change also lowered the JDK-internal native memory
usage enough to cause memory allocation in some Unsafe tests to succeed
because they expect OOM.

Filed https://bugs.openjdk.org/browse/JDK-8376398 to investigate these
brittle tests.

Eirik.
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