RFR: 8180450: secondary_super_cache does not scale well [v17]

[Andrew Haley]

On Thu, 25 Apr 2024 09:48:02 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

> I've filed https://bugs.openjdk.org/browse/JDK-8331117 for PPC64. @bulasevich, @fyang, @amitkumar: You may want to check if it makes sense for your platforms.

I think it makes sense everywhere. It's even a win on machines without POPCOUNT, which surprised me. Once you have hashed lookups the secondary supers cache doesn't help at all.

I want to delete the secondary supers cache soon, because it's an additional unnecessary step. @iwanowww did some measurements (DaCapo, Renaissance, SPECjbb2005, SPECjvm2008 on linux-x64/macos-aarch64), and he saw no significant regressions without secondary supers cache.

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PR Comment: https://git.openjdk.org/jdk/pull/18309#issuecomment-2077034709