RFR: JDK-8180450: secondary_super_cache does not scale well [v5]

[Andrew Haley]

On Fri, 22 Mar 2024 18:04:06 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> No, this option checks that the new (hashed) algorithm matches the old one.
>
> So what is difference between `UseSecondarySuperCache` and `VerifySecondarySupers`?
> The description is the same and only default values are different.

Sorry, I'll fix it. `UseSecondarySuperCache` refers to the "old" algorithm, and the only purpose of this flag is to allow the effect of disabling the secondary supers cache to be measured. `VerifySecondarySupers` allows test suites to be run in a mode that uses both the new hashed lookup and an exhaustive search in order to thest hashed lookups. It's very useful for testing ports.

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PR Review Comment: https://git.openjdk.org/jdk/pull/18309#discussion_r1536029900