<html>#2683: Slab fails to compile without MPI
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<tr><td style='text-align:right'> Reporter:</td><td>Roland Haas</td></tr>
<tr><td style='text-align:right'> Status:</td><td>new</td></tr>
<tr><td style='text-align:right'>Milestone:</td><td></td></tr>
<tr><td style='text-align:right'> Version:</td><td></td></tr>
<tr><td style='text-align:right'> Type:</td><td>bug</td></tr>
<tr><td style='text-align:right'> Priority:</td><td>major</td></tr>
<tr><td style='text-align:right'>Component:</td><td>EinsteinToolkit thorn</td></tr>
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<p>Slab only optionally depends on MPI and the Kranc tutorial <a data-is-external-link="true" href="http://kranccode.org/tutorial.html" rel="nofollow">http://kranccode.org/tutorial.html</a> does use it without MPI (or Carpet for that matter). In <a href="https://bitbucket.org/einsteintoolkit/tickets/commits/9ea25cd9" rel="nofollow" class="ap-connect-link">9ea25cd9</a> this ability was lost due to <code>MPI_Alltoallv</code> being limited to <code>int</code> variables for offsets and sizes thus not usable with the 64 bit code anymore.</p>
<p>Pull request<br>
<a data-is-external-link="true" href="https://bitbucket.org/cactuscode/cactusnumerical/pull-requests/19/slab-support-running-without-mpi" rel="nofollow">https://bitbucket.org/cactuscode/cactusnumerical/pull-requests/19/slab-support-running-without-mpi</a><br>
restores functionality to run without MPI and makes the Kranc tutorial work once more.</p>
<p>It is not really nice since it fudges the function prototype of the <code>MPI_Alltoallv</code> dummy function used in Slab.</p>
<p>--<br/>
Ticket URL: <a href='https://bitbucket.org/einsteintoolkit/tickets/issues/2683/slab-fails-to-compile-without-mpi'>https://bitbucket.org/einsteintoolkit/tickets/issues/2683/slab-fails-to-compile-without-mpi</a></p>
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