[petsc-users] [EXTERNAL] Re: Running PETSc with a Kokkos backend on OLCF Frontier

[Sircar, Arpan]

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: Barry Smith <bsmith at petsc.dev>
Sent: Friday, June 14, 2024 1:47 PM
To: Sircar, Arpan <sircara at ornl.gov>
Cc: petsc-users at mcs.anl.gov <petsc-users at mcs.anl.gov>; Gottiparthi, Kalyan <gottiparthik at ornl.gov>
Subject: [EXTERNAL] Re: [petsc-users] Running PETSc with a Kokkos backend on OLCF Frontier


   Please run both the CPU solvers and GPU solvers cases with -log_view and send the two outputs.

   Barry


On Jun 14, 2024, at 1:35 PM, Sircar, Arpan via petsc-users <petsc-users at mcs.anl.gov> wrote:

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Hi,

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 bash_petsc4foam_gpu) and configuring PETSc correctly (attached file config_gpu), the GPU solve seems to take more time than the CPU solve.

The PETSc run-time options we are using are attached to this email (file fvSolution_petsc_pKok_Uof). 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.

Thanks,
Arpan

Arpan Sircar
R&D Associate Staff
Thermal Hydraulics Group
Nuclear Energy and Fuel Cycle Division
Oak Ridge National Laboratory

<fvSolution_petsc_pKok_Uof><bash_petsc4foam_gpu><config_gpu>

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