Hey people, as go passes everything by value, am I

Question

Hey people, as go passes everything by value, am I

guaranteed to get always a better performance by passing complex types (slices, maps, arrays .. etc) by reference and returning a reference to the result to de-reference it in the function consumer? is it that simple?

0

24.10.2021

10 ответов

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Ghazwan Aliesh Автор вопроса

Liλn 🌻
Not really, no

I thought so but i can't find an argument, isn't an address memory always lighter than a copy?

0

24.10.2021

Liλn 🌻

Ghazwan Aliesh
I thought so but i can't find an argument, isn't a...

You shouldn’t worry about those implementation details IMHO

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24.10.2021

Ghazwan Aliesh Автор вопроса

Liλn 🌻
You shouldn’t worry about those implementation det...

u mean the performance benefit isn't that big to justify this? or there is possible no performance benefit at all?

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24.10.2021

Liλn 🌻

Ghazwan Aliesh
u mean the performance benefit isn't that big to j...

Again, it depends. I don’t think there’s a particular performance benefit. I think you should think about code in terms of readability and not speed

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24.10.2021

wm0

Ghazwan Aliesh
I thought so but i can't find an argument, isn't a...

There is a garbage collector in go. Therefore not always faster

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24.10.2021

Roman Sharkov

what do you mean by "by reference?" there's nothing like that in Go

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24.10.2021

Ghazwan Aliesh Автор вопроса

Roman Sharkov
what do you mean by "by reference?" there's nothin...

&some_value

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24.10.2021

Roman Sharkov

Ghazwan Aliesh
I thought so but i can't find an argument, isn't a...

it really depends. Yes, sometimes passing a big struct that's more than 64 bytes in memory can be more expensive than passing a pointer which is pointing to it. BUT you have to remember that Go is a garbage-collected language. If it's allocated on the heap due to escape enalysis it will create garbage that the GC will ultimately have to clean up, which increases overall system load slightly (this can add up if you do it too often) However, on most architectures copying structs smaller than 64 bytes is near instant (best way to check is to write a benchmark) so using a pointer can result in worse performance.

0

24.10.2021

Ghazwan Aliesh Автор вопроса

Roman Sharkov
it really depends. Yes, sometimes passing a big s...

👍 I totally missed that it's garbage collected.

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24.10.2021

Liλn 🌻 · Accepted Answer

Liλn 🌻

Not really, no

0

24.10.2021

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Hey people, as go passes everything by value, am I

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