[eigen] SparseMatrix StorageIndex

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To: "eigen@xxxxxxxxxxxxxxxxxxx" <eigen@xxxxxxxxxxxxxxxxxxx>
Subject: [eigen] SparseMatrix StorageIndex
From: Alexandre Sinding <alexandre.sinding@xxxxxxxxxxx>
Date: Wed, 26 Mar 2025 10:06:23 +0000
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Thread-topic: SparseMatrix StorageIndex

Hi,

I'm using Eigen to assemble very large sparse matrices (billions of nonzeros), and I'm hitting the limit for the default StorageIndex, so time for me to switch to 64-bit integers. Now, if I understand correctly this will affect all the stored indices thus having quite an impact on memory requirements. Why is not possible to change just the type of index for the outer indices which unless I'm missing something are the only indices that often exceed the 32-bit limit ? It this was possible it would only have a minor effect on memory consumption when switching from 32-bit to 64-bit.

Thanks,

Alexandre Sinding

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