RFR: 8373022: Increase initial heap size for test which assumes no GC

[Chris Plummer]

On Wed, 3 Dec 2025 14:59:10 GMT, Joel Sikström <jsikstro at openjdk.org> wrote:

> Hello,
> 
>  If the initial heap size is set too low in the following tests a GC might run, which will interfere with the tests and migh cause them to fail. To solve this, we should run the tests with a bumped initial heap size so that the GC does not interfere.
>  
> Test originally failed when run with `-XX:InitialRAMPercentage=0`. We now explicitly set `-XX:InitialHeapSize=100M` and they now always pass.
> 
> Testing:
> * Rerun 10 times with Serial and Parallel for each test and they all pass

It's probably just the timing of the GC that determines whether the initial small heap is a problem or not. If you want the SA tests to be reliable with something like InitialRAMPercentage=0, probably all of the tests should be updated. However, personally I don't think this type of fix should be necessary unless you feel testing in the manner is something we want to support. There are plenty of tests that start failing when non-standard command line options are used.

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PR Comment: https://git.openjdk.org/jdk/pull/28637#issuecomment-3607775022