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Hi! Are you on macOS? On Monterey there's an issue that means you need at least 12.4 to have more than 3GB.

yes, I use Monterey macOS, but when I set over 12.GB vm memory, It has same issue. Can I update my macOS version?

Yes, please upgrade your macOS version to at least 12.4 to be able to use more than 3GB of memory.