lemire.me on Hacker News

Ephemeral Testing(lemire.me)

71 points by ibobev 21 days ago | 25 comments

A blog post by Daniel Lemire on his blog titled "Ephemeral testing," a short essay about a software testing approach.

How did AMD Ryzen get 50% faster in two years?(lemire.me)

466 points by ibobev 1 month ago | 190 comments

Daniel Lemire blog post examining how AMD Ryzen processors became about 50% faster over two years.

Subnormal floating-point numbers are expensive on Intel processors(lemire.me)

53 points by zdw 1 month ago | 41 comments

Python sets and dictionaries can have quadratic-time performance(lemire.me)

85 points by ibobev 1 month ago | 50 comments

How much do amd64 microarchitecture levels help in Go?(lemire.me)

61 points by zdw 4 months ago | 39 comments

Only 17% of all 64-bit Integers are products of two 32-bit integers(lemire.me)

212 points by sebg 5 months ago | 96 comments

We see something that works, and then we understand it(lemire.me)

198 points by surprisetalk 5 months ago | 77 comments

You can beat the binary search(lemire.me)

344 points by vok 6 months ago | 152 comments

Daniel Lemire blog post arguing that binary search can be beaten, illustrated with quaternary search.

How many branches can your CPU predict?(lemire.me)

96 points by ibobev 7 months ago | 23 comments

How many branches can your CPU predict?(lemire.me)

85 points by chmaynard 7 months ago | 50 comments

Prefix sums at gigabytes per second with ARM NEON(lemire.me)

55 points by mfiguiere 7 months ago | 8 comments

You can use newline characters in URLs(lemire.me)

94 points by chmaynard 8 months ago | 41 comments

Why Speed Matters(lemire.me)

86 points by gsky 10 months ago | 29 comments

How fast can browsers process base64 data?(lemire.me)

35 points by mfiguiere 11 months ago | 20 comments

Memory-Level Parallelism: Apple M2 vs. Apple M4(lemire.me)

32 points by zdw 1 year ago | 7 comments

Discover C++26's compile-time reflection(lemire.me)

38 points by jandeboevrie 1 year ago | 20 comments

Speeding up C++ code with template lambdas(lemire.me)

3 points by ingve 1 year ago | 0 comments

Converting ASCII strings to lower case at crazy speeds with AVX-512(lemire.me)

9 points by kristianp 1 year ago | 1 comments

How fast can you parse a CSV file in C#?(lemire.me)

6 points by greghn 2 years ago | 1 comments

It is never too later to write your own C/C++ command-line utilities(lemire.me)

37 points by mfiguiere 2 years ago | 24 comments

Safer code in C++ with lifetime bounds(lemire.me)

8 points by mpweiher 2 years ago | 2 comments

Scan HTML even faster with SIMD instructions (C++ and C#) – Daniel Lemire's blog(lemire.me)

4 points by ayoreis 2 years ago | 0 comments

Scan HTML faster with SIMD instructions: .NET/C# Edition(lemire.me)

8 points by neonsunset 2 years ago | 0 comments

Scan HTML faster with SIMD instructions – Chrome edition(lemire.me)

227 points by p_l 2 years ago | 112 comments

Learning from the Object Oriented Mania(lemire.me)

34 points by beagle3 2 years ago | 35 comments

Learning from the Object-Oriented Mania(lemire.me)

4 points by usdogu 2 years ago | 0 comments

Fast and concise probabilistic filters in Python(lemire.me)

5 points by ingve 2 years ago | 0 comments

The financial value of open source software(lemire.me)

12 points by ibobev 2 years ago | 6 comments

Measuring energy usage: regular code vs. SIMD code(lemire.me)

40 points by ashvardanian 2 years ago | 13 comments

JSON Parsing: Intel Sapphire Rapids versus AMD Zen 4(lemire.me)

34 points by mfiguiere 2 years ago | 3 comments

How fast is rolling Karp-Rabin hashing?(lemire.me)

19 points by mfiguiere 2 years ago | 4 comments

C23: A Slightly Better C(lemire.me)

170 points by mfiguiere 2 years ago | 129 comments

How fast can you validate UTF-8 strings in JavaScript?(lemire.me)

16 points by greghn 2 years ago | 14 comments

How much memory bandwidth do large Amazon instances offer?(lemire.me)

59 points by ingve 2 years ago | 26 comments

Estimating your memory bandwidth(lemire.me)

52 points by ingve 2 years ago | 11 comments

Peer review is an honor-based system (2008)(lemire.me)

129 points by ibobev 2 years ago | 99 comments

Implementing the missing sign instruction in AVX-512(lemire.me)

14 points by mfiguiere 2 years ago | 0 comments

Data scientists need to learn about significant digits(lemire.me)

48 points by ibobev 2 years ago | 39 comments

Measuring the size of the cache line empirically(lemire.me)

27 points by ashvardanian 2 years ago | 1 comments

For processing strings, streams in C++ can be slow(lemire.me)

81 points by greghn 2 years ago | 73 comments

Parsing 8-bit integers quickly(lemire.me)

85 points by usdogu 2 years ago | 40 comments

How many billions of transistors in an iPhone processor?(lemire.me)

157 points by greghn 3 years ago | 160 comments

Appending to an std:string character-by-character: how does the capacity grow?(lemire.me)

37 points by greghn 3 years ago | 38 comments

Web server 'hello world' benchmark: Go vs. Node.js vs. Nim vs. Bun(lemire.me)

30 points by msndr 3 years ago | 47 comments

Parsing integers quickly with AVX-512(lemire.me)

156 points by usdogu 3 years ago | 30 comments

Transcoding Unicode strings at crazy speeds with AVX-512(lemire.me)

21 points by usdogu 3 years ago | 4 comments

Transcoding Latin 1 strings to UTF-8 strings at 12 GB/s using AVX-512(lemire.me)

110 points by mariuz 3 years ago | 87 comments

I do not use a debugger (2016)(lemire.me)

27 points by klyrs 3 years ago | 39 comments

Decoding base16 sequences quickly(lemire.me)

39 points by greghn 3 years ago | 11 comments

Packing a string of digits into an integer quickly(lemire.me)

88 points by mfiguiere 3 years ago | 15 comments

Parsing time stamps faster with SIMD instructions(lemire.me)

213 points by mfiguiere 3 years ago | 98 comments

Dynamic bit shuffle using AVX-512(lemire.me)

87 points by ibobev 3 years ago | 49 comments

Bit Hacking (with Go code)(lemire.me)

93 points by gus_leonel 3 years ago | 8 comments

Do we need copyright? (2012)(lemire.me)

139 points by ibobev 3 years ago | 141 comments

Can GPT pass my programming courses?(lemire.me)

27 points by greghn 3 years ago | 40 comments

Graviton 3, Apple M2 and Qualcomm 8cx 3rd gen: a URL parsing benchmark(lemire.me)

146 points by ibobev 3 years ago | 86 comments

Hotspot performance engineering fails(lemire.me)

160 points by slimsag 3 years ago | 85 comments

Defining interfaces in C++: concepts versus inheritance(lemire.me)

53 points by jandeboevrie 3 years ago | 21 comments

Defining interfaces in C++ with ‘concepts’ (C++20)(lemire.me)

49 points by pjmlp 3 years ago | 64 comments

Random digits is not enough to uniquely identify all human beings(lemire.me)

39 points by adunk 3 years ago | 51 comments

How many floating-point numbers are in the interval [0,1]? (2017)(lemire.me)

87 points by burntcaramel 3 years ago | 41 comments

Programming-language popularity by GitHub pull requests(lemire.me)

36 points by ibobev 3 years ago | 31 comments

Are your memory-bound benchmarking timings normally distributed?(lemire.me)

77 points by mfiguiere 3 years ago | 33 comments