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Yes, most (but not all) of our system test cases fail with the kokkos/cuda or cuda backends. All of them pass with the CPU-only kokkos backend.<br>
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<span style="font-size:11pt"><strong>Philip Fackler<br>
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<div><span style="font-size:11pt">Research Software Engineer, Application Engineering Group</span></div>
<div><span style="font-size:11pt">Advanced Computing Systems Research Section</span></div>
<div><span style="font-size:11pt">Computer Science and Mathematics Division<br>
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<div><span style="font-size:11pt"><strong>Oak Ridge National Laboratory</strong></span><span style="font-size:11pt"></span><br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Junchao Zhang <junchao.zhang@gmail.com><br>
<b>Sent:</b> Monday, November 14, 2022 19:34<br>
<b>To:</b> Fackler, Philip <facklerpw@ornl.gov><br>
<b>Cc:</b> xolotl-psi-development@lists.sourceforge.net <xolotl-psi-development@lists.sourceforge.net>; petsc-users@mcs.anl.gov <petsc-users@mcs.anl.gov>; Blondel, Sophie <sblondel@utk.edu>; Zhang, Junchao <jczhang@mcs.anl.gov>; Roth, Philip <rothpc@ornl.gov><br>
<b>Subject:</b> [EXTERNAL] Re: [petsc-users] Kokkos backend for Mat and Vec diverging when running on CUDA device.</font>
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<div dir="ltr">Hi, Philip,<br>
Sorry to hear that. It seems you could run the same code on CPUs but not no GPUs (with either petsc/Kokkos backend or petsc/cuda backend, is it right?
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<div dir="ltr">--Junchao Zhang</div>
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<div dir="ltr" class="x_gmail_attr">On Mon, Nov 14, 2022 at 12:13 PM Fackler, Philip via petsc-users <<a href="mailto:petsc-users@mcs.anl.gov">petsc-users@mcs.anl.gov</a>> wrote:<br>
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This is an issue I've brought up before (and discussed in-person with Richard). I wanted to bring it up again because I'm hitting the limits of what I know to do, and I need help figuring this out.</div>
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The problem can be reproduced using Xolotl's "develop" branch built against a petsc build with kokkos and kokkos-kernels enabled. Then, either add the relevant kokkos options to the "petscArgs=" line in the system test parameter file(s), or just replace the
system test parameter files with the ones from the "feature-petsc-kokkos" branch. See
<a href="" title="hxxps://github.com/ORNL-Fusion/xolotl/tree/feature-petsc-kokkos/benchmarks" target="_blank">
here</a> the files that begin with "params_system_".</div>
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Note that those files use the "kokkos" options, but the problem is similar using the corresponding cuda/cusparse options. I've already tried building kokkos-kernels with no TPLs and got slightly different results, but the same problem.<br>
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Any help would be appreciated.</div>
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Thanks,<br>
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<span style="font-size:11pt"><strong>Philip Fackler<br>
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<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<div><span style="font-size:11pt">Research Software Engineer, Application Engineering Group</span></div>
<div><span style="font-size:11pt">Advanced Computing Systems Research Section</span></div>
<div><span style="font-size:11pt">Computer Science and Mathematics Division<br>
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<div><span style="font-size:11pt"><strong>Oak Ridge National Laboratory</strong></span><span style="font-size:11pt"></span><br>
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