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Lazy
Light-weight header-only library for parallel function calls and continuations in C++ based on Eric Niebler's talk at CppCon 2019.
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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.
Benchmarks is indeed a good question. Here is a C++17-style library for parallel function calls which avoids std::{function, future, promise} and uses disposable threads for running the functions. I have run a few benchmarks against a typical thread pool which uses a mutex and a condition variable and a vector of threads.
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