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From Rust to reality: The hidden journey of fetch_max
A compiler deep-dive tracing Rust’s AtomicU64::fetch_max from macro expansion and rustc intrinsics through LLVM’s atomicrmw umax and AtomicExpandPass to the final x86-64 CAS loop
QuestDB is the open-source time-series database for demanding workloads—from trading floors to mission control It delivers ultra-low latency, high ingestion throughput, and a multi-tier storage engine. We get to work at a high level of abstraction, focusing on safety and logic, while the compiler handles the messy, error-prone, and incredibly complex task of generating correct and efficient code for the hardware. We could continue to dig into the microarchitecture, to see how instructions are executed at the hardware level, what are the effects of the LOCK prefix, dive into differences in memory ordering, etc.
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