dang 8 months ago

Related:

Are you sure you want to use MMAP in your DBMS? - https://news.ycombinator.com/item?id=39321038 - Feb 2024 (72 comments)

Are You Sure You Want to Use MMAP in Your Database Management System? (2022) - https://news.ycombinator.com/item?id=36563187 - July 2023 (177 comments)

Are You Sure You Want to Use MMAP in Your Database Management System? [pdf] - https://news.ycombinator.com/item?id=31504052 - May 2022 (43 comments)

Are you sure you want to use MMAP in your database management system? [pdf] - https://news.ycombinator.com/item?id=29936104 - Jan 2022 (127 comments)

Also:

Async hazard: MMAP is blocking IO - https://news.ycombinator.com/item?id=41312124 - Aug 2024 (115 comments)

But how, exactly, do databases use mmap? - https://news.ycombinator.com/item?id=25881911 - Jan 2021 (115 comments)

Why mmap is faster than system calls (2019) - https://news.ycombinator.com/item?id=25701959 - Jan 2021 (203 comments)

Why mmap is faster than system calls (2019) - https://news.ycombinator.com/item?id=24842648 - Oct 2020 (78 comments)

Use mmap with care - https://news.ycombinator.com/item?id=19805675 - May 2019 (213 comments)

Mmap(2) - https://news.ycombinator.com/item?id=10568921 - Nov 2015 (22 comments)

The mmap pattern - https://news.ycombinator.com/item?id=7678178 - May 2014 (46 comments)

Why not mmap? - https://news.ycombinator.com/item?id=2562800 - May 2011 (25 comments)

anacrolix 8 months ago

inb4 some smartass says mmap is the second coming.

I've been burned every which way using mmap. only use it when you identify a specific case that is sped up. a few examples that have worked are: linear indexes that involve a lot of seeks. fancy memory configurations like transparent ring buffers. loading executable code...

trouble starts when you do multi process sync, interact with networked filesystems, windows, or green threaded runtimes