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Use 64-bit integers when building PETSc
Issue #1700
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PETSc needs to be able to count up to the total (global) number of points it uses, not just process-local points. 32-bit integers are not sufficient for large runs. Note that e.g. Carpet already uses 64-bits integers for the same reason.
I suggest to enable the respective option when building PETSc by default. TATPETSc supports this, other thorns may need to be updated.
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If there are no downsides that you could think of, please apply.
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This was already applied on January 1, 2015.
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