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io_uring is faster than mmap
TL;DR Sourcing data directly from disk IS faster than caching in memory. I brought receipts.
My testing rig is a server with an old AMD EPYC 7551P 32-Core Processor on a Supermicro H11SSL-i and 96GB of DDR4 2133 MHz and a couple of 1.92TB Samsung PM983a PCIe 3.0 SSDs I pieced together from EBay parts. With such a system our throughput would not be affected by the dataset size, unlike the in-memory case, which has numa overhead and eventually runs out of memory to scale. Tis but a humble and hopefully fun exercise in exploring the limits and trends of modern hardware and the tradeoffs needed to maximize performance.
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