# MyRocks File Hints

**URL:** <https://forums.percona.com/t/myrocks-file-hints/40762>\
**Category:** Percona Server for MySQL 8.0\
**Tags:** myrocks\
**Created:** [May 8, 2026, 8:02pm UTC](https://forums.percona.com/t/myrocks-file-hints/40762 "2026-05-08T20:02:41Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Jay\_Rafati](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/jay_rafati/32/7228_2.png) [@Jay\_Rafati](https://forums.percona.com/u/Jay_Rafati)\
**Post date:** [May 8, 2026, 8:02pm UTC](https://forums.percona.com/t/myrocks-file-hints/40762/1 "2026-05-08T20:02:42Z")

</div>

Hi, does MyRocks sends file hints during compaction automatically or we have to configure that?

I am running Sysbench/Percona MySQL/MyRocks with io\_uring. Want to make sure MyRocks Hints are getting passed to io\_uring and then passed to the block layer. The file Hints I am referring to are Hot, Medium, Cold, and Extreme. Thank you.

---

<div class="post-metadata">

**Author:** ![matthewb](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/matthewb/32/34_2.png) [@matthewb](https://forums.percona.com/u/matthewb)\
**Post date:** [May 11, 2026, 3:43pm UTC](https://forums.percona.com/t/myrocks-file-hints/40762/2 "2026-05-11T15:43:54Z")

</div>

Hello @Jay_Rafati,  
This is all I could find:

> **[Build software better, together](https://github.com/search?q=repo%3Apercona%2Fpercona-server+io_uring&type=code)**
>
> GitHub is where people build software. More than 150 million people use GitHub to discover, fork, and contribute to over 420 million projects.

- `rocksdb_use_io_uring` – Enable io\_uring for asynchronous I/O.

Seems to be just on/off. You’d have to look at the source code for more information.