Thanks for giving coarrays a try and for reading my book. I’d love to be able to say that I’ve used coarrays more than the academic exercise in my book, but alas I have not. As a sanity check to ensure your software stack is set up correctly: are you able to run the tsunami example and see the speedup as you increase the number of images? For a sufficiently large domain (I think 1000x1000 should be big enough), you should be able to see close to a 4-times speedup when going from 1 to 4 images, for example. I haven’t done this since 2019, but back then it worked.
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