Comment (by Miguel Gracia):

I have updated the parfile with the Cactus::presync_mode = "mixed-error" option.

I ran the example using a machine configured with Intel(R) Xeon(R) Gold 6226R CPU @ 2.90GHz and 64Gb of ram.

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