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<span style="font-variant-ligatures: no-common-ligatures">Hello, </span></p>
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When I use MatMPIAIJSetPreallocation I get an argument out of range error, as below,</p>
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<span style="font-variant-ligatures: no-common-ligatures">[15]PETSC ERROR: Argument out of range</span></p>
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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></p>
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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.</p>
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I have also checked that every time I call MatSetValues that this location is not being set.</p>
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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?</p>
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I am using Petsc version 3.22.1 and Slepc version 3.22.1 with fortran.</p>
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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.</p>
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Thanks,</p>
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Matt</p>
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