RFR: JDK-8275608: runtime/Metaspace/elastic/TestMetaspaceAllocationMT2 too slow [v4]

[Aleksey Shipilev]

On Fri, 29 Oct 2021 09:55:53 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

>> Small tweaks to make these elastic metaspace stress tests faster.
>> 
>> Before, runtime for individual tests was wobbling between 40+ seconds and some rare timeouts at 3+ minutes, depending on machine load and random luck. Now, we get a steadfast 35-37 seconds.
>> 
>> I tested this manually, checking the numbers that we really test what we want to test (a lot of arena activity). Also GHAs and SAP nightlies.
>> 
>> Thanks, Thomas
>
> Thomas Stuefe has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains six additional commits since the last revision:
> 
>  - feedback alexey
>  - Merge
>  - Update test/hotspot/jtreg/runtime/Metaspace/elastic/RandomAllocator.java
>    
>    Co-authored-by: Aleksey Shipilëv <shade at redhat.com>
>  - Update test/hotspot/jtreg/runtime/Metaspace/elastic/RandomAllocator.java
>    
>    Co-authored-by: Aleksey Shipilëv <shade at redhat.com>
>  - adapt copyrights
>  - tweaks to improve runtime

test/hotspot/jtreg/runtime/Metaspace/elastic/TestMetaspaceAllocationMT2.java line 44:

> 42: 
> 43: /*
> 44:  * @test id=debugdefault

Why these changes?

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PR: https://git.openjdk.java.net/jdk/pull/6041