RFR: 8337493: [JVMCI] Number of libgraal threads might be too low

[duke]

On Tue, 1 Oct 2024 08:33:49 GMT, Raphael Mosaner <duke at openjdk.org> wrote:

> The `-XX:JVMCINativeLibraryThreadFraction` flag defines the ratio between JVMCI threads and C1 threads.
> With a default value of 0.33 the number of JVMCI threads is significantly smaller than the number of C2 threads would be.
> 
> This can lead to unexpected warmup behavior with `-XX:+UseJVMCICompiler`. This PR changes the default value of `-XX:JVMCINativeLibraryThreadFraction` to yield the same number of JVMCI threads as C2 threads.

@rmosaner 
Your change (at version 9e0a318831b5df4137104438626f22bb508cbc42) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/jdk/pull/21279#issuecomment-2385496949