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Code Health/Deps: Add Fast_IO library and use it #8808

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opened 2026-01-31 01:38:28 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 01:38:28 +00:00
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Originally created by @WSLUser on GitHub (Jun 4, 2020).

Description of the new feature/enhancement

fast_io is a C++ general-purpose exception-safe RAII I/O library based on C++ 20 Concepts. It is at least ten times faster than cstdio or iostream.

As this is compatible with stdio, cstdio (which has a pending PR still to replace stdio) and iostreams, simply use it for new code and refactorings to boost the performance of I/O in Windows Terminal even further. This will actually allow us to not use fmt for some things (not sure if the fmt calls that are superseded are actually in use yet). As part of getting C++20 compliant (ref: https://github.com/microsoft/terminal/issues/6251), this library should help get the project there. This is covered under the MIT license so there are no legal issues to worry about.

Proposed technical implementation details (optional)

Go to https://github.com/expnkx/fast_io and simply add the release into dep/ of our project. See the README to get a bunch of performance benchmark comparisons (it's a cross-platform project). There's also a video comparing to some of the fmt stuff. I guess there was some friction between the two project authors: https://www.youtube.com/watch?v=avyIFLuFUQs

Originally created by @WSLUser on GitHub (Jun 4, 2020). <!-- 🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨 I ACKNOWLEDGE THE FOLLOWING BEFORE PROCEEDING: 1. If I delete this entire template and go my own path, the core team may close my issue without further explanation or engagement. 2. If I list multiple bugs/concerns in this one issue, the core team may close my issue without further explanation or engagement. 3. If I write an issue that has many duplicates, the core team may close my issue without further explanation or engagement (and without necessarily spending time to find the exact duplicate ID number). 4. If I leave the title incomplete when filing the issue, the core team may close my issue without further explanation or engagement. 5. If I file something completely blank in the body, the core team may close my issue without further explanation or engagement. All good? Then proceed! --> # Description of the new feature/enhancement fast_io is a C++ general-purpose exception-safe RAII I/O library based on C++ 20 Concepts. It is at least ten times faster than cstdio or iostream. <!-- A clear and concise description of what the problem is that the new feature would solve. Describe why and how a user would use this new functionality (if applicable). --> As this is compatible with stdio, cstdio (which has a pending PR still to replace stdio) and iostreams, simply use it for new code and refactorings to boost the performance of I/O in Windows Terminal even further. This will actually allow us to not use fmt for some things (not sure if the fmt calls that are superseded are actually in use yet). As part of getting C++20 compliant (ref: https://github.com/microsoft/terminal/issues/6251), this library should help get the project there. This is covered under the MIT license so there are no legal issues to worry about. # Proposed technical implementation details (optional) Go to https://github.com/expnkx/fast_io and simply add the release into dep/ of our project. See the README to get a bunch of performance benchmark comparisons (it's a cross-platform project). There's also a video comparing to some of the fmt stuff. I guess there was some friction between the two project authors: https://www.youtube.com/watch?v=avyIFLuFUQs <!-- A clear and concise description of what you want to happen. -->
claunia added the Issue-TaskResolution-Won't-FixProduct-MetaArea-Build labels 2026-01-31 01:38:28 +00:00
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Reference: starred/terminal#8808
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