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lemire

🚀

working hard and fast

Daniel Lemire lemire

🚀

working hard and fast

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Software performance expert. Ranked in the top 2% of scientists globally (Stanford/Elsevier 2025) and among GitHub's top 1000 developers.

8.2k followers · 71 following

Université du Québec (TELUQ)
Montreal, Quebec, Canada
http://lemire.me/en/
@lemire
@lemire@mastodon.social
in/dlemire
@lemire.bsky.social

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Overview Repositories 387 Projects Packages Stars 219

Overview
Repositories
Projects
Packages
Stars

lemire/README.md

Hi there 👋

I am a computer science professor at the Université du Québec. 🇨🇦

📰 I write about software performance weekly on my blog.
🏫 Among world's top 2% scientists (Stanford University/Elsevier ranking).
📺 I gave a best voted talk at QCon San Francisco on JSON parsing.
🎥 We have a CppCon 2025 talk on super fast JSON processing using C++26 reflection.
🗺️ My software and algorithms are in most browsers and many standard libraries.
📄 I wrote over 100 research papers including over 60 journal articles.
📖 I am editor of the Software: Practice and Experience journal (Wiley); it was founded in 1971.
📎 On‐demand JSON: A better way to parse documents? was the most read article of the last 5 years at SPE (2024).
📎 Parsing millions of URLs per second was the most read article of the last 5 years at SPE (2025).
📘 I have written many books, my latest books: Mastering Programming: From Testing to Performance in Go and Faster Than You Think: Essays on Thinking Better and Building Faster

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simdjson/simdjson simdjson/simdjson Public

Parsing gigabytes of JSON per second : used by Facebook/Meta Velox, the Node.js runtime, ClickHouse, WatermelonDB, Apache Doris, Milvus, StarRocks

C++ 24.2k 1.3k
RoaringBitmap/RoaringBitmap RoaringBitmap/RoaringBitmap Public

A better compressed bitset in Java: used by Apache Spark, Netflix Atlas, Apache Pinot, Tablesaw, and many others

Java 3.9k 592
RoaringBitmap/roaring RoaringBitmap/roaring Public

Roaring bitmaps in Go (golang), used by InfluxDB, Bleve, DataDog

Go 2.9k 260
fastfloat/fast_float fastfloat/fast_float Public

Fast and exact implementation of the C++ from_chars functions for number types: 4x to 10x faster than strtod, part of GCC 12, MySQL, DuckDB, Chromium, Redis and WebKit/Safari

C++ 2.1k 191
simdutf/simdutf simdutf/simdutf Public

Unicode routines (UTF8, UTF16, UTF32) and Base64: billions of characters per second using SSE2, AVX2, NEON, AVX-512, RISC-V Vector Extension, LoongArch64, POWER. Part of Node.js, WebKit/Safari, Lad…

C++ 1.9k 147
ada-url/ada ada-url/ada Public

WHATWG-compliant and fast URL parser written in modern C++, part of Internet Archive, Node.js, Clickhouse, Redpanda, Kong, Telegram, Adguard, Datadog and Cloudflare Workers.

C++ 1.8k 133

lemire (Daniel Lemire) · GitHub

Daniel Lemire lemire

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