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<span style="margin:0px">Lucas, </span></div>
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<span style="margin:0px">Solving</span></div>
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<span style="margin:0px">A X = B^T #MatMatTransposeSolve() </span>-- supported by petsc/mumps interface</div>
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<span style="margin:0px">or </span></div>
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A^T X = B #MatTransposeMatSolve() -- not supported</div>
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which one do you want ?</div>
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Hong</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> petsc-users <petsc-users-bounces@mcs.anl.gov> on behalf of Junchao Zhang <junchao.zhang@gmail.com><br>
<b>Sent:</b> Thursday, August 4, 2022 5:21 PM<br>
<b>To:</b> Barry Smith <bsmith@petsc.dev><br>
<b>Cc:</b> petsc-users@mcs.anl.gov <petsc-users@mcs.anl.gov><br>
<b>Subject:</b> Re: [petsc-users] Question about speed of MatMatSolveTranspose with MUMPS</font>
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<p class="x_gmail-p1" style="margin:0px; font-variant-numeric:normal; font-variant-east-asian:normal; font-stretch:normal; line-height:normal; font-family:Helvetica">
It seems yes, from mump manual</p>
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ICNTL(9) computes the solution using A or A<span class="x_gmail-s1" style="font-variant-numeric:normal; font-variant-east-asian:normal; font-stretch:normal; line-height:normal">T</span></p>
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Phase: accessed by the host during the solve phase.</p>
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Possible values :</p>
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1 : AX = B is solved.</p>
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!= 1 : A<span class="x_gmail-s1" style="font-variant-numeric:normal; font-variant-east-asian:normal; font-stretch:normal; line-height:normal">T</span>X = B is solved.</p>
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<div dir="ltr" class="x_gmail_attr">On Thu, Aug 4, 2022 at 4:20 PM Barry Smith <<a href="mailto:bsmith@petsc.dev">bsmith@petsc.dev</a>> wrote:<br>
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Yes, it appears no MUMPS matmatsolvetranspose is wired in. Does MUMPS provide such a function? If so it can be added with a few lines of code.
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<div> Barry</div>
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<div>On Aug 4, 2022, at 3:55 PM, Lucas Banting <<a href="mailto:bantingl@myumanitoba.ca" target="_blank">bantingl@myumanitoba.ca</a>> wrote:</div>
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Hello,<br>
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I am using MUMPS to solve a system with multiple right hand sides.</div>
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I have noticed that the MatMatSolve function appears to be quite a bit faster than the MatMatSolveTranspose function.<br>
I was trying to look through the petsc source to see where the MatMatSolveTranspose_MUMPS function was but couldn't find it.<br>
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Is PETSc just doing MatSolveTranspose_MUMPS for each right hand side when doing MatMatSolveTranspose with MUMPS?<br>
If an accelerated version of MatMatSolveTranspose existed, it would be very useful for my application.<br>
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Regards,
<div>Lucas</div>
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