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Dear PETSc Team,</div>
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<br>
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I am trying to use IS embeding in parallel. </div>
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In order to (try to) understand how it works, I have built a simple example, attached to this email.</div>
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<br>
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I consider a 20X20 matrix. The dof (u, p, t) in global numbering are the following : </div>
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u: 0..9 p: 10..14 t: 15..19</div>
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<div style="font-family: Calibri, Arial, Helvetica, sans-serif; margin: 0px;"><font size="3" face="Calibri,sans-serif"><br>
</font></div>
<div style="margin: 0px;"><font face="Calibri, sans-serif" size="3">I have defined 4 IS to describe the dof u, p, t and the agglomeration of u and p, called up.</font></div>
<div style="margin: 0px;"><font face="Calibri, sans-serif" size="3">I first extract the submatrix matrix(up,up), then I would like to extract from it the (u,u) block.</font></div>
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<div style="margin: 0px;"><font face="Calibri, sans-serif" size="3">The example runs OK in sequential but I do not obtain the (u,u) block on 2 processes.</font></div>
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<div style="font-family: Calibri, Arial, Helvetica, sans-serif; margin: 0px;"><font size="3" face="Calibri,sans-serif">I have a mistake in the build of the sub-IS but I cannot find it for days.</font></div>
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<div style="font-family: Calibri, Arial, Helvetica, sans-serif; margin: 0px;"><font size="3" face="Calibri,sans-serif">Best regards,
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<div style="font-family: Calibri, Arial, Helvetica, sans-serif; margin: 0px;"><font face="Calibri,sans-serif"><font size="3" style="">Nicolas<br>
<span style="font-size:11pt">--</span></font><br>
</font><font size="2" face="Arial,sans-serif" color="#ff8100"><span style="font-size:9pt"><b>Nicolas Tardieu</b></span></font><br>
<div style="margin:0px"><font size="2" face="Calibri,sans-serif"><span style="font-size:11pt"><font size="1" face="Arial,sans-serif" color="#ff8100"><span style="font-size:8pt"><b>Ing PhD Computational Mechanics</b></span></font><font size="1" face="Arial,sans-serif" color="#ff8100"><span style="font-size:8pt"><b><br>
</b></span></font></span></font></div>
<div style="margin:0px"><font size="2" face="Calibri,sans-serif"><span style="font-size:11pt"><font size="1" face="Arial,sans-serif" color="#0062e1"><span lang="en-US" style="font-size:8pt">EDF - R&D Dpt ERMES</span></font><font size="1" face="Helv,sans-serif" color="#0062e1"><span lang="en-US" style="font-size:2pt"><br>
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<div style="margin:0px"><span style="font-family: Arial, sans-serif; font-size: 8pt; color: rgb(0, 98, 225); background-color: rgba(0, 0, 0, 0);">PARIS-SACLAY, FRANCE</span></div>
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