[lworld] RFR: 8377829: [lworld] SPECjvm2008:serial performance regression in comparing JDK27 mainline and valhalla default repo default mode(without --enable-preview) [v2]

Fri Feb 13 19:20:56 UTC 2026

On Fri, 13 Feb 2026 18:29:22 GMT, Sergey Kuksenko <skuksenko at openjdk.org> wrote:

>> SPECjvm2008:serial shows a performance regression when comparing JDK27 mainline and valhalla default repo default mode (without --enable-preview). The regression is -10%-15% on all platforms.
>> Rewriting ObjectInputStream from StreamAPI to loops and iterators allows restoring the performance.
>
> Sergey Kuksenko has updated the pull request incrementally with one additional commit since the last revision:
> 
>   restore individual import

Looks good,  thanks.

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

Marked as reviewed by rriggs (Committer).

PR Review: https://git.openjdk.org/valhalla/pull/2097#pullrequestreview-3799049678