Top 10 Mmap Open-Source Projects

FlatBuffers

48 22,005 8.7 C++

FlatBuffers: Memory Efficient Serialization Library

Project mention: FlatBuffers – an efficient cross platform serialization library for many langs | news.ycombinator.com | 2023-09-18

mio

8 1,625 0.0 C++

Cross-platform C++11 header-only library for memory mapped file IO (by vimpunk)
InfluxDB

www.influxdata.com sponsored

Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
react-native-mmkv-storage

9 1,500 7.3 C++

An ultra fast (0.0002s read/write), small & encrypted mobile key-value storage framework for React Native written in C++ using JSI
csv2

1 510 4.3 C++

Fast CSV parser and writer for Modern C++
Shtreeba

12 286 0.0 C++

VAC-proof 32bit DLL injector written in C++, using memory mapping and thread hijacking techniques
hypergrep

5 163 9.3 C++

Recursively search directories for a regex pattern

Project mention: Ugrep – a more powerful, ultra fast, user-friendly, compatible grep | news.ycombinator.com | 2023-12-30

Another issue with Hyperscan is that if you enable HS_FLAG_UTF8[1], which hypergrep does[2,3], and then search invalid UTF-8, then the result is UB.
> This flag instructs Hyperscan to treat the pattern as a sequence of UTF-8 characters. The results of scanning invalid UTF-8 sequences with a Hyperscan library that has been compiled with one or more patterns using this flag are undefined.
That's another issue you'll need to grapple with if you use Hyperscan. PCRE2 used to have this issue[4], but they've since defined the semantics of searching invalid UTF-8 with Unicode mode enabled. ripgrep 14 uses that new mode, but I haven't updated that FAQ answer yet.
[1]: https://intel.github.io/hyperscan/dev-reference/api_files.ht...
[2]: https://github.com/p-ranav/hypergrep/blob/ee85b713aa84e0050a...
[3]: https://github.com/p-ranav/hypergrep/blob/ee85b713aa84e0050a...
[4]: https://github.com/BurntSushi/ripgrep/blob/master/FAQ.md#why...

prelockd

6 100 2.5 Python

Lock executables and shared libraries in memory to improve system responsiveness under low-memory conditions

Project mention: Linuxatemyram.com | news.ycombinator.com | 2023-10-09

This may or may not preserve your desktop and other important applications in an OOM situation. https://github.com/hakavlad/prelockd

WorkOS

workos.com sponsored

The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
rulloc

1 76 10.0 Rust

General purpose memory allocator written in Rust.
timezoneLookup

3 45 1.5 Go

Timezone lookup API for GPS Coordinates based from GeoJSON
s3parcp

2 37 2.6 Go

Faster than s3cp

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020).