GC ergonomics just works within the limits of the heap it’s given

Ergomonics has a default for the relative sizes of the young generation and the tenured generation in the heap. If you have command line flags to specify the sizes of the generations (probably something like -XX:NewRatio=ratio or -XX:MaxNewSize=bytes), use them. GC ergonomics normally does not change the maximum size of a generation so if you know something about how your application runs such that you know it benefits from a larger or smaller young generation, pass that information along on the command line. Again GC ergonomics just works within the limits of the heap it’s given.

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