[lworld] Integrated: 8369893: [lworld] Split multiple @run statements in runtime tests into separate @test blocks

[Paul Hübner]

On Fri, 17 Oct 2025 07:59:24 GMT, Paul Hübner <phubner at openjdk.org> wrote:

> Hi all,
> 
> This PR mirrors the changes made to [the compiler](https://github.com/openjdk/valhalla/pull/1681) `jtreg` testing setup ([issue](https://bugs.openjdk.org/browse/JDK-8369437)).
> 
> **Concretely:**
> * Split multiple (independent) `@run`s into separate `@test` blocks, specifying new IDs where appropriate.
> * Added packages where we missed them for consistency. This excludes places where the test setup does not allow for packages or for tests that are disabled (some of which don't compile, as our model is evolving). 
> * Changed `@run main/othervm` into `@run main` when there was no flag passed.
> 
> **Impact:**
> 
> I compared machine execution time in tiers 1-4 to `jdk-26-valhalla+1-89` (which my changes are based on). 
> 
> | | lworld | lworld + patch | improvement
> -- | -- | -- | -- 
> tier1 | 1d 00h 26m 16s |  1d 00h 13m 20s | ~ - 3 mins
> tier2 | 1d 03h 16m 04s | 1d 01h 24m 05s | ~ -2 hours
> tier3 | 2d 17h 29m 13s | 2d 17h 16m 15s | ~ -13 mins
> tier4 | 2d 11h 32m 26s | 2d 01h 05m 40s | ~ -10 hours
> 
> Overall, the trend shows shorter execution times. (And by extension, probably less electricity usage too :))
> 
> Note that the CI ran a few extra tasks at tiers 2,  (two orders of magnitude less compared to the total number of tasks) than my personal run did. I don't think these will impact the results significantly.
> 
> *Disclaimers: these measurements were run before adding packages and getting rid of a few leftover `main/othervm`, although these should not change the results significantly. Also, this is very ad-hoc "benchmarking," variance is not measured.*

This pull request has now been integrated.

Changeset: f2299db1
Author:    Paul Hübner <phubner at openjdk.org>
Committer: David Simms <dsimms at openjdk.org>
URL:       https://git.openjdk.org/valhalla/commit/f2299db186da9519d47a7089da5c98bb94ed19a2
Stats:     426 lines in 52 files changed: 279 ins; 1 del; 146 mod

8369893: [lworld] Split multiple @run statements in runtime tests into separate @test blocks

Reviewed-by: chagedorn, coleenp

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

PR: https://git.openjdk.org/valhalla/pull/1682