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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Look at another library that implements printing in C++, fmt, especially to part dedicated to benchmarks, you will see that this library is much faster then std::ostream (which is cout) so there is definitely room for improvement.
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Hence, a higher number means a more popular project.