# Microarchitecture guarantees (for SIMD CPU features)

**URL:** <https://community.fly.io/t/microarchitecture-guarantees-for-simd-cpu-features/21740>\
**Category:** General\
**Tags:** wishlist, docs, machines, login-only\
**Created:** [September 9, 2024, 1:10pm UTC](https://community.fly.io/t/microarchitecture-guarantees-for-simd-cpu-features/21740 "2024-09-09T13:10:18Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![SabrinaJewson](https://sea1.discourse-cdn.com/fly1/user_avatar/community.fly.io/sabrinajewson/32/48367_2.png) [@SabrinaJewson](https://community.fly.io/u/SabrinaJewson)\
**Post date:** [September 9, 2024, 1:10pm UTC](https://community.fly.io/t/microarchitecture-guarantees-for-simd-cpu-features/21740/1 "2024-09-09T13:10:18Z")

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I’m writing compiled apps to run on performance Machines and I would obviously like to make use of vectorized instructions as much as possible. This post is a feature request for Fly to provide a guarantee about the oldest microarchitectures used currently by the Fly servers, and the oldest microarchitectures that will be used in future. For example, if I knew that all the Fly servers now and in future will be post–Sandy Bridge and post-Bulldozer, I could enable AVX.

Ideally, this information would be published and kept up-to-date somewhere in the Fly documentation, but a reply here is fine as well :）

It would also be nice to have Fly’s default templates for e.g. Rust enable the appropriate features via `-C target-feature=…` flags.

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**Author:** ![mayailurus](https://sea1.discourse-cdn.com/fly1/user_avatar/community.fly.io/mayailurus/32/17593_2.png) [@mayailurus](https://community.fly.io/u/mayailurus)\
**Post date:** [September 10, 2024, 2:30pm UTC](https://community.fly.io/t/microarchitecture-guarantees-for-simd-cpu-features/21740/2 "2024-09-10T14:30:57Z")

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Tags updated on September 10, 2024, 2:30pm UTC

Added #docs, #machines, #wishlist

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**Author:** ![system](https://global.discourse-cdn.com/fly1/original/3X/6/e/6e8955d00cb218e186ebbe3a6ab06fefdce15290.svg) [@system](https://community.fly.io/u/system)\
**Post date:** [September 17, 2024, 2:31pm UTC](https://community.fly.io/t/microarchitecture-guarantees-for-simd-cpu-features/21740/3 "2024-09-17T14:31:18Z")

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Closed on September 17, 2024, 2:31pm UTC

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