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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.

     

       
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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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<img src="1brc.png" alt="1BRC" style="display: block; margin-left: auto; margin-right: auto; margin-bottom:1em; width: 50%;">

     

       
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The text file contains temperature values for a range of weather stations.

     

       
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Each row is one measurement in the format `<string: station name>;<double: measurement>`.

     

       
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The following shows ten rows as an example: