Comment (by Bing-Jyun Tsao):

Gallery test run poisson-20230510 is completed and updated. The link for the thornlist is pointed to https://bitbucket.org/einsteintoolkit/manifest/raw/ET_2023_05/einsteintoolkit.th which does not exist yet.
A new visit session file psi4.session is needed for either cases of running with 1 thread or 8 threads with VisIt 3.2.1, and the session file is included in the compressed folder poisson-20230510.tar.gz in downloads.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2173/test-poisson-equation-example