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lemire

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working hard and fast

Daniel Lemire lemire

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working hard and fast

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Daniel Lemire is a computer science professor. His research is on software performance in data engineering.

5.3k followers · 67 following

Université du Québec (TELUQ)
Montreal, Canada
http://lemire.me/en/
@lemire

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lemire/README.md

Hi there 👋

I am a computer science professor at the Université du Québec (Canada).

📰 I write about software performance weekly on my blog where .
📫 I can be reached on twitter.
📺 I gave a best voted talk at QCon San Francisco.
📄 I write research papers on software issues.
📖 I am editor of the Software: Practice and Experience journal (Wiley).

Pinned

simdjson/simdjson Public

Parsing gigabytes of JSON per second

C++ 16.3k 885
RoaringBitmap/RoaringBitmap Public

A better compressed bitset in Java

Java 2.9k 469
RoaringBitmap/roaring Public

Roaring bitmaps in Go (golang)

Go 1.9k 189
bits-and-blooms/bloom Public

Go package implementing Bloom filters

Go 1.8k 210
fastfloat/fast_float Public

Fast and exact implementation of the C++ from_chars functions for float and double types: 4x faster than strtod, part of GCC 12

C++ 970 80
simdutf/simdutf Public

Unicode routines (UTF8, UTF16, UTF32): billions of characters per second using SSE2, AVX2, NEON, AVX-512.

C++ 523 36

1,210 contributions in the last year

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Contribution activity

December 2022

Created 100 commits in 17 repositories

Created a pull request in simdutf/simdutf that received 14 comments

Improving drastically the performance of the utf-8 to utf-16 icelake transcoder in some cases

Over some inputs dominated by 1-byte and 2-byte UTF-8 characters, the icelake utf-8 to utf-16 transcoder has very low instruction/cycle count. The …

+10 −4 • 14 comments

Opened 13 other pull requests in 7 repositories

simdutf/simdutf 1 open 3 merged

ada-url/ada 2 merged 1 closed

Sets up the bases for a benchmark. Dec 21
Skeleton for WPT tests Dec 20
Simplifying the parse class Dec 19

fastfloat/fast_float 2 merged

Adding GCC 12 tests (CI) Dec 23
Cleaning our CI a bit. Dec 13

RoaringBitmap/RoaringBitmap 1 merged

Added a performance hint. Dec 25

lemire/FastPFor 1 merged

Avoid multiple redefinition when including codecfactory.h from different .cpp Dec 17

bits-and-blooms/bloom 1 open

This improves slightly the documentation. Dec 12

simdjson/simdjson 1 open

Updating Google Benchmark. Dec 9

Reviewed 17 pull requests in 5 repositories

ada-url/ada 11 pull requests

feat: add ipv6 parser Dec 24
feat: add host state Dec 23
Sets up the bases for a benchmark. Dec 21
fix: remove unused variables Dec 21
add multiple states Dec 21
Skeleton for WPT tests Dec 21
feat: trim C0 control or space from input Dec 20
style: improve code styling Dec 20
Simplifying the parse class Dec 20
feat: add scheme start state Dec 20
feat: add public api headers Dec 19

nodejs/node 2 pull requests

buffer: add buffer.isUtf8 for utf8 validation Dec 25
deps: add simdutf dependency Dec 21

simdutf/simdutf 2 pull requests

RoaringBitmap/RoaringBitmap 1 pull request

add RangeBitmap.eq and RangeBitmap.neq Dec 17

lemire/fast_double_parser 1 pull request

Supporting IBM i/PASE env. Dec 7

Created an issue in simdutf/simdutf that received 2 comments

add support for punycode

https://en.wikipedia.org/wiki/Punycode

2 comments

Opened 1 other issue in 1 repository

RoaringBitmap/RoaringBitmap 1 open

Add getContainerCount() method Dec 25

Answered 1 discussion in 1 repository

simdjson/simdjson

SAX parsing....
This contribution was made on Dec 15

20 contributions in private repositories Dec 8 – Dec 23