<div dir="ltr"><div dir="ltr">On Thu, Jan 18, 2024 at 9:04 AM Yesypenko, Anna <<a href="mailto:anna@oden.utexas.edu">anna@oden.utexas.edu</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="msg-2862965372389970225">
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Dear Petsc users/developers,</div>
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I'm experiencing a bug when using petsc4py with GPU support. It may be my mistake in how I set up a AIJCUSPARSE matrix.</div>
<div><span style="letter-spacing:normal;font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:16px;color:rgb(0,0,0);background-color:rgb(255,255,255);font-weight:400">For
larger matrices, I sometimes encounter a error in assigning matrix values; the error is thrown in PetscHMapIJVQuerySet().</span></div>
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Here is a minimum snippet that populates a sparse tridiagonal matrix. </div>
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```</div>
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from petsc4py import PETSc</div>
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from scipy.sparse import diags</div>
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import numpy as np</div>
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<div><span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">n = int(5e5); </span></div>
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<div><span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">nnz = 3 * np.ones(n, dtype=np.int32); nnz[0] = nnz[-1] = 2</span></div>
<div><span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">A = PETSc.Mat(comm=PETSc.COMM_WORLD)</span></div>
<div><span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">A.createAIJ(size=[n,n],comm=PETSc.COMM_WORLD,nnz=nnz)</span></div>
<div><span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">A.setType('aijcusparse')</span></div>
<div><span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">tmp = diags([-1,2,-1],[-1,0,+1],shape=(n,n)).tocsr()</span></div>
<div><span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">A.setValuesCSR(tmp.indptr,tmp.indices,tmp.data) ####### this
is the line where the error is thrown.</span></div>
<div><span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">A.assemble()</span></div>
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```</div></div></div></blockquote><div><br></div><div>I don't have scipy installed. Since the matrix is so small, can you print tmp.indptr,tmp.indices,tmp.data when you run? It seems to be either bad values there, or something is wrong with passing those pointers.</div><div><br></div><div> Thanks,</div><div><br></div><div> Matt</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="msg-2862965372389970225"><div dir="ltr">
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The error trace is below:</div>
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```</div>
<div><span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">File "petsc4py/PETSc/Mat.pyx", line 2603, in petsc4py.PETSc.Mat.setValuesCSR</span></div>
<div><span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)"> File "petsc4py/PETSc/petscmat.pxi", line 1039, in petsc4py.PETSc.matsetvalues_csr</span></div>
<div><span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)"> File "petsc4py/PETSc/petscmat.pxi", line 1032, in petsc4py.PETSc.matsetvalues_ijv</span></div>
<div><span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">petsc4py.PETSc.Error: error code 76</span></div>
<div><span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">[0] MatSetValues() at /work/06368/annayesy/ls6/petsc/src/mat/interface/matrix.c:1497</span></div>
<div><span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">[0] MatSetValues_Seq_Hash() at /work/06368/annayesy/ls6/petsc/include/../src/mat/impls/aij/seq/seqhashmatsetvalues.h:52</span></div>
<div><span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">[0] PetscHMapIJVQuerySet() at /work/06368/annayesy/ls6/petsc/include/petsc/private/hashmapijv.h:10</span></div>
<div><span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">[0] Error in external library</span></div>
<div><span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">[0] [khash] Assertion: `ret >= 0' failed.</span></div>
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```</div>
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If I run the same script a handful of times, it will run without errors eventually.</div>
<div><span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">Does anyone have insight on why it is behaving this way? I'm running on a node with
3x NVIDIA A100 PCIE 40GB.</span></div>
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</span></div>
<div><span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">Thank you!</span></div>
<div><span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">Anna</span></div>
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</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="http://www.cse.buffalo.edu/~knepley/" target="_blank">https://www.cse.buffalo.edu/~knepley/</a><br></div></div></div></div></div></div></div></div>