Why is mmap instant if I map a 100GiB file

Question

C / C++

Thomas

Why is mmap instant if I map a 100GiB file

and why didn't my machine freeze?

0

06.11.2024

8 ответов

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Thomas Автор вопроса

And why does it behave the same on Windows if I use MapViewOfFile?

0

1 месяц назад

Thomas Автор вопроса

Daniele°
This only happens if you have cow

What do you even mean

0

1 месяц назад

D

It doesn’t actually read data from file until you access the mapped region

0

1 месяц назад

D

Thomas
And why does it behave the same on Windows if I us...

Same byte ordering scheme

0

1 месяц назад

Thomas Автор вопроса

D
It doesn’t actually read data from file until you...

Exactly what I'm trying to say

0

1 месяц назад

Thomas Автор вопроса

D
Same byte ordering scheme

the fuck

0

1 месяц назад

D

Thomas
the fuck

Little-endian byte ordering

0

1 месяц назад

Daniele° · Accepted Answer

Daniele°

This only happens if you have cow

0

1 месяц назад

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Why is mmap instant if I map a 100GiB file

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