<i18n dev> Integrated: 8373566: Performance regression with java.text.MessageFormat subformat patterns

[Justin Lu]

On Fri, 12 Dec 2025 21:59:52 GMT, Justin Lu <jlu at openjdk.org> wrote:

> This PR addresses a performance degradation when constructing a new MessageFormat that contains a subformat with a pattern that is not a predefined style. This is due to internal logic which catches an IAE specifically for subformat patterns. Perf tests for choice and number are not grouped, since performance is directly tied to subformat creation.
> 
> M1 Mac - Perf (before):
> 
> 
> MessageFormatterBench.testSubformatChoice  thrpt   15   865.430 ±  6.766  ops/ms
> MessageFormatterBench.testSubformatNumber  thrpt   15  1021.808 ± 11.413  ops/ms
> 
> 
> M1 Mac - Perf (after):
> 
> 
> Benchmark                                   Mode  Cnt     Score    Error   Units
> MessageFormatterBench.testSubformatChoice  thrpt   15  1671.033 ± 55.012  ops/ms
> MessageFormatterBench.testSubformatNumber  thrpt   15  3275.727 ± 47.370  ops/ms

This pull request has now been integrated.

Changeset: 81e37576
Author:    Justin Lu <jlu at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/81e375768837e1ae6c34c1d0a8eff06b4e1d2889
Stats:     58 lines in 2 files changed: 21 ins; 9 del; 28 mod

8373566: Performance regression with java.text.MessageFormat subformat patterns

Reviewed-by: liach, rriggs, naoto

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PR: https://git.openjdk.org/jdk/pull/28806