[lworld] RFR: 8369893: [lworld] Split multiple @run statements in runtime tests into separate @test blocks [v2]

[duke]

On Mon, 20 Oct 2025 09:07:23 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.*
>
> Paul Hübner has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add names to WrappersOffsetTest.

@Arraying 
Your change (at version a3cc584460dd874ce6b4fa05d9835eda3a47815b) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/valhalla/pull/1682#issuecomment-3435555610