<div dir="ltr">Luc,<div>S<span style="font-size:12.7272720336914px">LEPc is for eigenvalue problems with sparse matrices; it interfaces to LAPACK for sequential dense problems. </span></div><div><br></div><div>I'm adding MatElementalHermitianGenDefiniteEig() into PETSc/Elemental interface for a petsc user (see <a href="https://bitbucket.org/petsc/petsc/branch/hzhang/elemental-matconvert">https://bitbucket.org/petsc/petsc/branch/hzhang/elemental-matconvert</a>).</div><div><br></div><div>You may take a look at Elemental and check which eigenvalue routine would work for your problem. We may add it to the interface if it does not take much of effort.</div><div><br></div><div>Hong<br><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Jan 21, 2015 at 9:55 AM, Luc Berger-Vergiat <span dir="ltr"><<a href="mailto:lb2653@columbia.edu" target="_blank">lb2653@columbia.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
  
    
  
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    <div>You can also look into SLEPc to compute
      eigenvalues in parallel for the global system.<br>
      SLEPc is based on PETSc so it should not be too hard to use in
      your code.<br>
      <pre cols="72">Best,
Luc</pre><div><div class="h5">
      On 01/21/2015 10:53 AM, Matthew Knepley wrote:<br>
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          <div class="gmail_quote">On Wed, Jan 21, 2015 at 9:51 AM,
            siddhesh godbole <span dir="ltr"><<a href="mailto:siddhesh4godbole@gmail.com" target="_blank">siddhesh4godbole@gmail.com</a>></span>
            wrote:<br>
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                <div style="font-family:georgia,serif">Hello,<br>
                  <br>
                </div>
                <div style="font-family:georgia,serif">I want to execute
                  Monte Carlo simulations for eigenvalue problem in
                  parallel with PETSC. i am using LAPACKsygvx function
                  to compute all the eigenvalues. Now the problem i am
                  facing is that, i think LAPACKsygvx requires Matrices
                  to be declared as MATSEQDENSE, and this sequential
                  type is not allowing me to execute this program on
                  multiple processors. <br>
                </div>
                <div style="font-family:georgia,serif"><br>
                </div>
                <div style="font-family:georgia,serif">How should i go
                  about this problem? can i use different communicators
                  or something? Please help!</div>
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            <div>Do you need all the eigenvalues? If so, you can try to
              use Elemental, with the development version of PETSc.</div>
            <div><br>
            </div>
            <div>  Thanks,</div>
            <div><br>
            </div>
            <div>    Matt</div>
            <div> </div>
            <blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
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                  <div>
                    <div dir="ltr"><b><font face="georgia, serif">Siddhesh
                          M Godbole</font></b>
                      <div><br>
                      </div>
                      <div><font color="#666666">5th year Dual Degree,</font></div>
                      <div><font color="#666666">Civil Eng & Applied
                          Mech.</font></div>
                      <div><font color="#666666">IIT Madras</font></div>
                    </div>
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          <br>
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          <div><br>
          </div>
          -- <br>
          <div>What most experimenters take for
            granted before they begin their experiments is infinitely
            more interesting than any results to which their experiments
            lead.<br>
            -- Norbert Wiener</div>
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