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Nim 2.0's ARC/ORC memory management gives you deterministic deallocation without GC pauses. This blog covers ownership semantics, cycle collection, migration friction, and a worked cyclic-list example—plus the trade-offs you'll hit in production.
Nim's ORC memory management mode provides deterministic destruction for latency-sensitive CLI tools by using reference counting instead of tracing GC, but requires careful ownership design to avoid leaks.
Nim's Optimized Reference Counting (ORC) delivers deterministic destruction without a garbage collector, making it suitable for embedded, real‑time, and WASM targets. This post walks through how ORC works, a cyclic data‑structure example, and the trade‑offs you must accept.
Learn how to select Nim's ARC/ORC memory management for deterministic, low‑latency services, with concrete build commands, FFI safety rules, and verification steps.
Learn how to select Nim's ARC or ORC memory model for deterministic, low‑latency systems, understand trust/data boundaries, and break reference cycles with WeakRef to avoid leaks.
Learn how Nim's ARC and ORC provide deterministic destruction, eliminate GC pauses, and improve C/C++ interoperability, with configuration tips and pitfalls.
Compile Nim with --gc:orc to get reference counting plus an incremental cycle collector, giving deterministic cleanup and low latency for graph‑heavy services while avoiding stop‑the‑world pauses.
The goal is to safely manage memory for a seq of objects that each define a =destroy destructor and may form reference cycles through their fields. When using the default ORC garbage collector ( --gc:orc ), cycles containing seq or ref are not reclaimed automatically unless the type is marked with the acyclic pragma or the cycle collector is invoked manually
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