# Orders of magnitude runtime difference in row-wise norm

**URL:** <https://discourse.julialang.org/t/orders-of-magnitude-runtime-difference-in-row-wise-norm/96363>\
**Category:** Performance\
**Created:** [March 20, 2023, 10:06pm UTC](https://discourse.julialang.org/t/orders-of-magnitude-runtime-difference-in-row-wise-norm/96363 "2023-03-20T22:06:52Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![tictaccat](https://avatars.discourse-cdn.com/v4/letter/t/9f8e36/32.png) [@tictaccat](https://discourse.julialang.org/u/tictaccat)\
**Post date:** [March 20, 2023, 10:55pm UTC](https://discourse.julialang.org/t/orders-of-magnitude-runtime-difference-in-row-wise-norm/96363/3 "2023-03-20T22:55:46Z")

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[Preventing broadcast fusing](https://discourse.julialang.org/t/preventing-broadcast-fusing/20372/) contains more detailed discussion about the broadcasting fusing slowdown (a failure of LICM for a theoretically pure `norm` function? EDIT: maybe not, because LICM can’t create temporary arrays I suppose?)

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_[View the full topic](https://discourse.julialang.org/t/orders-of-magnitude-runtime-difference-in-row-wise-norm/96363)._