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1️⃣🐝🏎️ The One Billion Row Challenge

A C++ implementation of the orignal java challenge here: https://github.com/gunnarmorling/1brc

Discussion thread here: gunnarmorling#495

Example usage.

clang++-16 -O3 -std=c++20 -march=native -pthread main.cpp
THREADS=8 ./a.out

g++ should also work. You can also specify the number of "linear chunks" with CHUNKS env var. Unmaps will occur at end of each chunk. Default is 8.

CHUNKS=8 THREADS=8 ./a.out