RFR: 8269032: Stringdedup tests are failing if the ergonomically select GC does not support it
Per Liden
pliden at openjdk.java.net
Tue Jun 29 11:12:06 UTC 2021
On Tue, 29 Jun 2021 10:24:12 GMT, Leo Korinth <lkorinth at openjdk.org> wrote:
>> Please review this change to the string deduplication tests' handling of an
>> ergonomically chosen GC. They were assuming G1 would be chosen in that
>> case, but that's wrong of course. The test machine might not be a server
>> class machine, or G1 might not be included in the build.
>>
>> Each test now has a second test declaration comment for handling the case
>> where no GC is specified by the jtreg invocation. This second declaration
>> will force the use of G1 by the test if G1 is supported by the VM.
>>
>> I looked into trying to be more clever and selecting a different GC if G1 is
>> not supported by the VM, but that ended up making the tests a lot more
>> messy, and doesn't seem like that important a use-case at this time. A
>> better long-term solution would be to make all the GCs (except Epsilon)
>> support string deduplication, so we don't care which GC gets ergonomically
>> chosen. But that's not happening today.
>>
>> Testing:
>> Ran the string deduplication tests with various configurations: (1)
>> explicitly use G1 (2) no explicit GC, (3) no explicit GC with
>> -XX:+NeverActAsServerClassMachine.
>
> test/hotspot/jtreg/gc/stringdedup/TestStringDeduplicationTools.java line 73:
>
>> 71: }
>> 72: }
>> 73:
>
> I think it would be good to parse the gc string. Otherwise it might be easy to make a spelling mistake or add another argument (before) to the driver without realizing the error.
I think we should just blindly pass this option (or options) to the spawned JVMs, without looking at them.
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PR: https://git.openjdk.java.net/jdk/pull/4603
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