🐹 Go Reached 1.96s In One Billion Row Challenge

C++ and Rust get out of way. Golang yet prooves it’s not only safe but also super fast

On January, 1, 2024 Gunnar Morling announced an algorithic contest initially for Java developers.

The contest was held until the end of January. The goal of it was to write a Java app that will process a file with one billion temperature readings looking like this:

Hamburg;12.0
Bulawayo;8.9
Palembang;38.8
St. John's;15.2
Cracow;12.6
...

Each row contains a reading of a temperature. The location name and reading is separated by a semicolon. Temperature reading has one fraction number.

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As a result the app should return statistics about the data:

{Abha=5.0/18.0/27.4, Abidjan=15.7/26.0/34.1, Abéché=12.1/29.4/35.6, Accra=14.7/26.4/33.1, Addis Ababa=2.1/16.0/24.3, Adelaide=4.1/17.3/29.7, ...}

So it has to output min, mean and max value for each location.

Quite easy. Except that there is a billion of readings in a file of the size of 13 GB.