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Hello,
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<div>I found a type elsewhere in my code and have fixed this issue.</div>
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<div>Thanks,</div>
<div>Matt<br id="lineBreakAtBeginningOfMessage">
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<div>On 27 Nov 2024, at 12:06 PM, Matthew Thomas <Matthew.Thomas1@anu.edu.au> wrote:</div>
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<span style="font-variant-ligatures: no-common-ligatures">Hello, </span></div>
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When I use MatMPIAIJSetPreallocation I get an argument out of range error, as below,</div>
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<span style="font-variant-ligatures: no-common-ligatures">[15]PETSC ERROR: Argument out of range</span></div>
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<span style="font-variant-ligatures: no-common-ligatures">[15]PETSC ERROR: New nonzero at (8,421) caused a malloc. Use MatSetOption(A, MAT_NEW_NONZERO_ALLOCATION_ERR, PETSC_FALSE) to turn off this check</span></div>
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However, when I run the code again with identical parameters without MatMPIAIJSetPreallocation, there is no non-zero at the location that caused the error (8, 421). Using -mat_view I can see that row 8 only contains a single value at column 8, which is expected
and what I have allocated for.</div>
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I have also checked that every time I call MatSetValues that this location is not being set.</div>
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I am very confident my dnnz and onnz arrays have been set correctly, do you have any idea why this new non-zero is created?</div>
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I am using Petsc version 3.22.1 and Slepc version 3.22.1 with fortran.</div>
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This issue does not occur with small number of processors, (1-8), however, this error is consistent when I use >8 processors.</div>
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Thanks,</div>
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Matt</div>
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