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Hi Barry, Thanks for your prompt response. These are run with with the same PETSc solvers but the one on GPUs (log_pKok) uses mataijkokkos while the other one does not. Please let me know if you need any other information. Thanks, Arpan From:
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Hi Barry,</div>
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Thanks for your prompt response. These are run with with the same PETSc solvers but the one on GPUs (log_pKok) uses mataijkokkos while the other one does not.</div>
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Please let me know if you need any other information.</div>
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Thanks,</div>
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Arpan</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Barry Smith <bsmith@petsc.dev><br>
<b>Sent:</b> Friday, June 14, 2024 1:47 PM<br>
<b>To:</b> Sircar, Arpan <sircara@ornl.gov><br>
<b>Cc:</b> petsc-users@mcs.anl.gov <petsc-users@mcs.anl.gov>; Gottiparthi, Kalyan <gottiparthik@ornl.gov><br>
<b>Subject:</b> [EXTERNAL] Re: [petsc-users] Running PETSc with a Kokkos backend on OLCF Frontier</font>
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Please run both the CPU solvers and GPU solvers cases with -log_view and send the two outputs.
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<div> Barry</div>
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<div>On Jun 14, 2024, at 1:35 PM, Sircar, Arpan via petsc-users <petsc-users@mcs.anl.gov> wrote:</div>
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Hi,</div>
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We have been working with OpenFOAM (an open-source CFD software) which can transfer its matrices to PETSc to use its linear solvers. This has been tested and is working well on OCLF's Frontier machine. Next we are trying to use the Kokkos backend to run it
on Frontier GPUs. While the OpenFOAM+PETSc+Kokkos environment built correctly on Frontier using the modules sourced (attached file<span class="x_Apple-converted-space"> </span><i>bash_petsc4foam_gpu</i>) and configuring PETSc correctly (attached file<span class="x_Apple-converted-space"> </span><i>config_gpu</i>),
the GPU solve seems to take more time than the CPU solve.</div>
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The PETSc run-time options we are using are attached to this email (file<span class="x_Apple-converted-space"> </span><i>fvSolution_petsc_pKok_Uof</i>). Could you please take a look and let us know if this combination of options is fine? In this approach we
are trying to solve the pressure equation only on the GPUs.</div>
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Thanks,</div>
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Arpan</div>
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<span style="background-color:rgb(255,255,255)"><b>Arpan Sircar</b></span></div>
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<span style="background-color:rgb(255,255,255)">R&D Associate Staff</span></div>
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<span style="background-color:rgb(255,255,255)">Thermal Hydraulics Group</span></div>
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Nuclear Energy and Fuel Cycle Division</div>
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<b>Oak Ridge National Laboratory</b></div>
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<span id="x_cid:30E5FD77-BD68-4987-9F1C-4EF987DA4B33"><fvSolution_petsc_pKok_Uof></span><span id="x_cid:F8894B7F-0EC7-4EB0-8607-4434E292F59C"><bash_petsc4foam_gpu></span><span id="x_cid:9F0AA58D-E203-4872-8D80-814D21CBB4C1"><config_gpu></span></div>
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