https://docs.einsteintoolkit.org/et-docs/index.php?action=history&feed=atom&title=Using_the_multi-model_mechanism_in_CarpetUsing the multi-model mechanism in Carpet - Revision history2026-05-13T12:59:29ZRevision history for this page on the wikiMediaWiki 1.31.0https://docs.einsteintoolkit.org/et-docs/index.php?title=Using_the_multi-model_mechanism_in_Carpet&diff=5158&oldid=prevRhaas: fix subject of reference email given2018-04-04T13:53:34Z<p>fix subject of reference email given</p>
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<td colspan="2" style="background-color: #fff; color: #222; text-align: center;">Revision as of 13:53, 4 April 2018</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>To use the multi-model mechanism in <tt>Carpet</tt>:</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>To use the multi-model mechanism in <tt>Carpet</tt>:</div></td></tr>
</table>Rhaashttps://docs.einsteintoolkit.org/et-docs/index.php?title=Using_the_multi-model_mechanism_in_Carpet&diff=3869&oldid=prevRhaas: add Erik's email2015-04-26T12:08:47Z<p>add Erik's email</p>
<p><b>New page</b></p><div>This text was originally extracted from [http://cactuscode.org/pipermail/developers/2015-April/006360.html Running Cactus under Windows] to Cactus developers mailing list.<br />
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To use the multi-model mechanism in <tt>Carpet</tt>:<br />
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# Arrange for mpirun to start the <tt>Cactus</tt> run with different parameter files for different MPI ranks. All MPI implementations I know of have a mechanism for this. You may or may not want to use different executables as well.<br />
# In the parameter files, set the parameter <code>Carpet::model</code> to different strings.<br />
# <tt>Carpet</tt> will then group all MPI ranks by this parameter's value, create a communicator for each of these, and start independent runs for each.<br />
# So far, all you've done is starting several completely unrelated and independent simulations with one mpirun call.<br />
# <tt>Carpet</tt> offers an aliased function <code>GetMPICommUniverse</code> that returns the original MPI communicator that allows all processes to communicate. (Compare with <code>GetMPICommWorld</code>.) Note that there is no implicit or implied synchronization between the different worlds; this is your responsibility.<br />
# Thorn <tt>CactusNumerical/Slab</tt> has a mechanism for passing an MPI communicator that it should use, allowing you to transfer hyperslabs between worlds. Other thorns may be extended similarly if necessary.</div>Rhaas