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On Fri, Mar 15, 2024 at 9: 55 AM Frank Bramkamp <bramkamp@ nsc. liu. se> wrote: Dear PETSc Team, I am using the latest petsc version 3. 20. 5. I would like to create a matrix using MatCreateSeqAIJ To insert values, I use MatSetValues. It
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<div dir="ltr"><div dir="ltr">On Fri, Mar 15, 2024 at 9:55 AM Frank Bramkamp <<a href="mailto:bramkamp@nsc.liu.se">bramkamp@nsc.liu.se</a>> wrote:<br></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 class="msg951868517517927389"><u></u>
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Dear PETSc Team, I am using the latest petsc version 3. 20. 5. I would like to create a matrix using MatCreateSeqAIJ To insert values, I use MatSetValues. It seems that the Fortran interface/stubs are missing for MatsetValues, as the linker does
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<div><pre style="font-family:sans-serif;font-size:100%;white-space:pre-wrap">Dear PETSc Team,
I am using the latest petsc version 3.20.5.
I would like to create a matrix using
MatCreateSeqAIJ
To insert values, I use MatSetValues.
It seems that the Fortran interface/stubs are missing for MatsetValues, as the linker does not find any subroutine with that name.
MatSetValueLocal seems to be fine.</pre></div></div></blockquote><div><br></div><div>Here is a Fortran example calling MatSetValues():</div><div><br></div><div> <a href="https://urldefense.us/v3/__https://gitlab.com/petsc/petsc/-/blob/main/src/ksp/ksp/tutorials/ex1f.F90?ref_type=heads__;!!G_uCfscf7eWS!ag7gfsg4qE_beGvp2_VPt5PyN1bZcFr8xkVlbukEpUnqYHx_awYDepWWZfT-7rtVF5-lHC2GXj1ETtSIaOLc$">https://gitlab.com/petsc/petsc/-/blob/main/src/ksp/ksp/tutorials/ex1f.F90?ref_type=heads</a></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg951868517517927389"><div><pre style="font-family:sans-serif;font-size:100%;white-space:pre-wrap">Typically I am using a blocked matrix format (BAIJ), which works fine in fortran.
Soon we want to try PETSC on GPUs, using the format MATAIJCUSPARSE, since there seems not to be a blocked format available in PETSC for GPUs so far.</pre></div></div></blockquote><div>You can use the blocked input API, like MatSetValuesBlocked(), with all the storage formats. There is no explicit blocking in the <span style="font-family:sans-serif;font-size:13px">MATAIJCUSPARSE format because Nvidia handles the optimization differently.</span></div><div><br></div><div> Thanks,</div><div><br></div><div> Matt</div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg951868517517927389"><div><pre style="font-family:sans-serif;font-size:100%;white-space:pre-wrap">Therefore I first want to try the pointwise format MatCreateSeqAIJ format on a CPU, before using the GPU format.
I think that CUDA also supports a block format now ?! Maybe that would be also useful to have one day.
Greetings, Frank Bramkamp
</pre></div>
</div></blockquote></div><br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><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><div><br></div><div><a href="https://urldefense.us/v3/__http://www.cse.buffalo.edu/*knepley/__;fg!!G_uCfscf7eWS!ag7gfsg4qE_beGvp2_VPt5PyN1bZcFr8xkVlbukEpUnqYHx_awYDepWWZfT-7rtVF5-lHC2GXj1ETjfW9H4P$" target="_blank">https://www.cse.buffalo.edu/~knepley/</a><br></div></div></div></div></div></div></div></div>