<html>#2119: The binary neutron star gallery example gives different results with the release candiate.
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<tr><td style='text-align:right'> Reporter:</td><td>Peter Diener</td></tr>
<tr><td style='text-align:right'> Status:</td><td>open</td></tr>
<tr><td style='text-align:right'>Milestone:</td><td>ET_2019_10</td></tr>
<tr><td style='text-align:right'> Version:</td><td>development version</td></tr>
<tr><td style='text-align:right'> Type:</td><td>bug</td></tr>
<tr><td style='text-align:right'> Priority:</td><td>minor</td></tr>
<tr><td style='text-align:right'>Component:</td><td>Other</td></tr>
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<p>Comment (by Roland Haas):</p>
<p>I ran the parfile (making sure to ask for 4th order finite differencing for the hydro source terms) using ET_Proca + Meudon_Bin_NS version <a data-is-external-link="true" href="/data/rhaas/postdoc/gr/cactus/ET_Proca/repos/einsteininitialdata/commits/eec2b89a3b8ed1dd0c947ca133808c00047c0a70" rel="nofollow">eec2b89a</a> "Exact: fix integer dvision for Goedel spacetime" of <a data-is-external-link="true" href="/data/rhaas/postdoc/gr/cactus/ET_Proca/repos/einsteininitialdata" rel="nofollow">einsteininitialdata</a>. This produces results (pre-merger) that are indistinguishable from results produced using the code originally run on Zwicky. There is a difference post-merger but given the huge difference running with or without <code>-Ofast</code> made I am not concerned about that. Both runs used the same compilation options (using <code>-O2</code>). I will run one more run using the master version of Meudon_Bin_NS to check what differences become visible. Commit <a data-is-exte
rnal-link="true" href="https://bitbucket.org/einsteintoolkit/einsteininitialdata/commits/1b9d6a3eff34224a357a61e3b74d5468f8efa82b" rel="nofollow">1b9d6a3</a> "Meudon_Bin_NS: using EOS_Omni" of <a data-is-external-link="true" href="https://bitbucket.org/einsteintoolkit/einsteininitialdata" rel="nofollow">einsteininitialdata</a> is known to change the ID on the grid a bit (see <a data-is-external-link="true" href="https://bitbucket.org/einsteintoolkit/tickets/issues/2119/the-binary-neutron-star-gallery-example#comment-50396585" rel="nofollow">https://bitbucket.org/einsteintoolkit/tickets/issues/2119/the-binary-neutron-star-gallery-example#comment-50396585</a>) but mostly in the post-merger region.</p>
<p><img alt="" src="https://bitbucket.org/repo/8zBLME5/images/473440499-psi4_Meudon_Proca.png" />
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<p>--<br/>
Ticket URL: <a href='https://bitbucket.org/einsteintoolkit/tickets/issues/2119/the-binary-neutron-star-gallery-example'>https://bitbucket.org/einsteintoolkit/tickets/issues/2119/the-binary-neutron-star-gallery-example</a></p>
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