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  1. Jun 21, 2023
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    • Carsten Gräser's avatar
    • Carsten Gräser's avatar
    • Carsten Gräser's avatar
      Switch to std::uint_least32_t for stored indices in MatrixIndexSet · 4886d18b
      Carsten Gräser authored
      Using `std::uint_least32_t` instead of `std::size_t` halves the required memory
      and thus also improves performance.
      Notice that `std::uint32_t` is optional and `std::uint_fast32_t` is intended to be
      fast in terms of computations and may have 64 bits. Here we're interested in reducing
      memory and thus bandwith. Hence `std::uint_least32_t`, which is the smallest sufficient
      type is most appropriate.
      4886d18b
    • Carsten Gräser's avatar
      Switch internal data structure in MatrixIndexSet · c8272a07
      Carsten Gräser authored
      This replaces the `std::set` used to store the column indices for each
      rows by a `std::vector` based implementation. The `std::vector` is
      kept sorted when inserting such that we can avoid duplicates. This
      can improve assembly time of matrices significantly (if `MatrixIndexSet` is used).
      
      In the worst case (insertion in reverse) this may lead to O(n^2) complexity
      when inserting n entries in a row compared to O(n log(n)) for `std::set`.
      However, the sorted `std::vector` implementation still wins for relatively
      large n. To avoid the worst case complexity when using very dense rows,
      the implementation is switched to `std::set` if the size exceeds the threshold
      value `maxVectorSize`. The default `maxVectorSize=2048` was selected based
      on benchmark results.
      c8272a07
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