Decision Workspace
mmap-guard vs memmap2 vs fmmap
Side-by-side comparison of Rust crates
51
mmap-guard
experimentalv0.2.0
Safe, guarded memory-mapped file I/O for Rust
66
memmap2
growingv0.9.10
Cross-platform Rust API for memory-mapped file IO
55
fmmap
growingv0.4.0
A flexible and convenient high-level mmap for zero-copy file I/O.
Core Metrics
| mmap-guard | memmap2 | fmmap | |
|---|---|---|---|
| Health Score | 51 | 66 | 55 |
| Total Downloads | 483 | 212.7M | 213.1K |
| 30d Downloads | 483 | 16.0M | 16.2K |
| Dependents | 0 | 14.4K | 138 |
| Releases | 2 | 35 | 14 |
| Last Updated | 19d ago | 40d ago | 398d ago |
| Age | 19d | 6y 2m | 4y 3m |
Health Breakdown
mmap-guard
Maintenance
13
Quality
14
Community
6
Popularity
3
Documentation
15
memmap2
Maintenance
16
Quality
11
Community
16
Popularity
8
Documentation
15
fmmap
Maintenance
7
Quality
15
Community
12
Popularity
6
Documentation
15
Technical Details
| mmap-guard | memmap2 | fmmap | |
|---|---|---|---|
| Version | 0.2.0 | 0.9.10 | 0.4.0 |
| Stable (≥1.0) | ✗ No | ✗ No | ✗ No |
| License | MIT OR Apache-2.0 | MIT OR Apache-2.0 | MIT OR Apache-2.0 |
| Dependencies | 3 | 4 | 20 |
| Crate Size | 26KB | 35KB | 73KB |
| Features | 0 | 0 | 6 |
| Yanked % | 0.0% | 5.7% | 0.0% |
| Edition | 2024 | 2021 | 2021 |
| MSRV | 1.89 | 1.63 | 1.65.0 |
| Owners | 1 | 4 | 1 |
Links
Quick Verdict
- •memmap2 leads with a health score of 66/100, but none of the options score above 80.
- •memmap2 is depended on by 14.4K crates — strongest ecosystem trust.
- •⚠ fmmap has not been updated in over a year.