memmap2
v0.9.11 GrowingCross-platform Rust API for memory-mapped file IO
Quick Verdict
- ✓Actively maintained (updated 21d ago)
- !Pre-1.0: API may have breaking changes
- ✓Massive adoption (21.5K crates depend on it)
- ✓Permissive license (MIT OR Apache-2.0)
Security
Deep Insights
22.2M downloads in the last 30 days (740.8K/day), up 3% from the previous period.
21.5K crates depend on memmap2 — it's part of the Rust ecosystem's core infrastructure. Removing it from your dependency tree would be extremely difficult.
Despite being 6+ years old, memmap2 hasn't reached 1.0 yet. Expect potential API changes between versions.
At 34KB, memmap2 is lightweight. Small crate size correlates with focused, well-scoped functionality.
Notable dependents include addr2line, blake3, arrow-ipc, arrow, symbolic-common. When high-quality crates choose memmap2, it's a strong quality signal.
Health Breakdown
Recency, release consistency, active ratio
Yanked ratio, deps, size, maturity, features
Reverse deps, ownership, ecosystem
Downloads, momentum, growth trend
Docs, repo, license, metadata
Download Trend
Top Dependents
Most downloaded crates that depend on memmap2