MPI Compatibility Issue Resolved on macOS Sequoia 15.0

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Clara Dehman

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Sep 30, 2024, 11:56:50 AM9/30/24

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Hi,

I’m reaching out regarding a solution I found for getting MPI to work properly on my MacBook, which might be helpful for anyone facing similar issues.

After updating my MacBook to the latest macOS (Sequoia 15.0) and Xcode (16.0), I encountered problems running the Pencil Code with multiple processors due to MPI no longer functioning. I attempted various fixes, including reverting to the previous Xcode version (15.3), which had worked before, and uninstalling and reinstalling both Xcode and Homebrew (which I used to install MPI). However, the problem persisted.

I then decided to use MacPorts instead of Homebrew. While installing MacPorts, I was prompted to update to the latest version of Xcode (16.0). Once I did that, installing MPI via MacPorts successfully resolved the issue.

I hope this information is helpful to anyone experiencing similar problems.

Clara Dehman

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