<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">Mark:</div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><div><div class="gmail-h5"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="gmail-m_-579243501843033290gmail-m_-1861859659216709041HOEnZb"><div class="gmail-m_-579243501843033290gmail-m_-1861859659216709041h5"><br>
> > [2998]PETSC ERROR: #2 PetscTableCreate() line 52 in<br>
> > /global/u2/m/madams/petsc_inst<wbr>all/petsc/src/sys/utils/ctable<wbr>.c<br>
> > [2998]PETSC ERROR: #3 MatTransposeMatMultSymbolic_MP<wbr>IAIJ_MPIAIJ() line 1691<br></div></div></blockquote></div></div></div></div></div></blockquote><div><br></div><div> <span style="color:rgb(80,0,80)">MatTransposeMatMult() tends to use much larger ctable than MatMatMult.</span></div><div><span style="color:rgb(80,0,80)">Is your matrix symmetric? If so, </span><span style="color:rgb(80,0,80)">MatMatMult() will use smaller ctable and require less communication.</span></div><div><span style="color:rgb(80,0,80)"><br></span></div><div><span style="color:rgb(80,0,80)">Hong</span></div></div><br></div></div>