ned14/llfio

Health v2 · maintenance only

Flags: no_license

Adoption not part of the score

1047 stars · 56 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

LLFIO is a low-level file I/O and filesystem library for C++17/20, originally proposed for the C++ standard (P1031). It provides zero-copy, race-free, low-overhead file operations with strong support for storage class memory and directly mapped non-volatile storage.

Use cases

• perform low-latency file i/o in C++ with minimal syscall overhead
• write portable filesystem algorithms across Windows, Linux and macOS
• work with directly mapped non-volatile storage like Intel Optane
• avoid TOCTOU races in filesystem code
• do file i/o with exceptions and RTTI disabled
• maximize IOPS for 4Kb random transfers on fast storage

When to choose

• you need very low per-operation i/o overhead (~100ns) in C++
• you target SCM/DAX or NVMe storage and want portable filesystem algorithms
• you need race-free, zero-malloc filesystem operations with preserved error codes

When to avoid

• you just need simple high-level file reading/writing - std::filesystem or your language's stdlib suffices
• you need a stable C++ standard API - the standardisation effort was abandoned in 2025
• you work outside C++ or need a managed-language library

Facets

library · maturity stable

file-system developer-tools developer-tools files performance cpp windows cross-platform file-io filesystem low-latency storage-class-memory dax cpp17 zero-copy standardisation-proposal linux macos

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