# Best practice for array allocation in self-consistent calculations

**URL:** <https://discourse.julialang.org/t/best-practice-for-array-allocation-in-self-consistent-calculations/79371>\
**Category:** Performance\
**Created:** [April 12, 2022, 9:34am UTC](https://discourse.julialang.org/t/best-practice-for-array-allocation-in-self-consistent-calculations/79371 "2022-04-12T09:34:00Z")\
**Posts on this page:** 1\
**Showing post:** 9

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**Author:** ![Sukera](https://avatars.discourse-cdn.com/v4/letter/s/ce7236/32.png) [@Sukera](https://discourse.julialang.org/u/Sukera)\
**Post date:** [April 12, 2022, 3:39pm UTC](https://discourse.julialang.org/t/best-practice-for-array-allocation-in-self-consistent-calculations/79371/9 "2022-04-12T15:39:25Z")

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If the binding is `const`, the type will be fixed, yes, but you can still have a performance impact due to the compiler not knowing whether there’s something else that _may_ access that global as well.

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