Hi all, I have a relatively big simulation function (which has 20,000 repeated loops). The @time results show more than 64.5G allocations. Are there some tips to reduce the allocations? Thank you in advance.

See Performance Tips · The Julia Language. Specifically, check for type instability and slicing as the two most likely.

Thank you very much for the advice!

This is helpful, thank you very much @lmiq

In my simulation https://github.com/ufechner7/KiteModels.jl/blob/main/src/KPS4.jl I have zero allocation. Line 386ff, is the main callback function. function residual!(res, yd, y::MVector{S, SimFloat}, s::KPS4, time) where S I use this struct @with_kw mutable struct KPS4{S, T, P, Q, SP} <: AbstractKiteModel as first parameter of most functions which holds the work arrays. It is alllocated only once at the start of the program. In most cases I use SVectors and MVectors, but only for Vectors with less than 100 elements. Perhaps this gives you some ideas…

Thank you very much @ufechner7 , going to check your code.

Best practices to reduce allocations in Julia

General Usage Performance

lmiq September 22, 2023, 6:02pm 4

Also: Common allocation mistakes

Topic		Replies	Views
Help to reduce number of allocations General Usage	23	5855	January 6, 2019
Too many allocations? Performance	23	2093	February 18, 2021
Understanding meanings of memory allocation numbers New to Julia performance , memory-allocation	3	793	June 22, 2018
Minimizing Allocations - How to? Resources? New to Julia	5	946	August 19, 2020
Reduce the allocations in the for loop General Usage question , memory-allocation	3	519	November 17, 2023

Best practices to reduce allocations in Julia

Related topics