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Rule and value range clarifications

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Gunnar Morling 2024-01-04 12:19:31 +01:00 committed by GitHub
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# 1️⃣🐝🏎️ The One Billion Row Challenge
_Status Jan 1: This challenge is open for submissions!_
_Status Jan 1: This challenge is [open for submissions](https://www.morling.dev/blog/one-billion-row-challenge/)!_
The One Billion Row Challenge (1BRC) is a fun exploration of how far modern Java can be pushed for aggregating one billion rows from a text file.
Grab all your (virtual) threads, reach out to SIMD, optimize your GC, or pull any other trick, and create the fastest implementation for solving this task!
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* Implementations must be provided as a single source file
* The computation must happen at application _runtime_, i.e. you cannot process the measurements file at _build time_
(for instance, when using GraalVM) and just bake the result into the binary
* Input value ranges are as follows:
* Station name: non null UTF-8 string of min length 1 character and max length 100 characters
* Temperature value: non null double between -99.9 (inclusive) and 99.9 (inclusive), always with one fractional digit
* Implementations must not rely on specifics of a given data set, e.g. any valid station name as per the constraints above and any data distribution (number of measurements per station) must be supported
## Entering the Challenge