A Persistent System in Real Use - Experiences of the First 13 Years https://tunes.org/wiki/eumel.html (amazing OS where even processes are persistent)
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I certainly see the appeal of an LLM system with full context and tool use (OpenClaw), but the lethal trifecta puts me off deploying it.
I do like the idea of an agent with a heartbeat though. A bunch of nice cron-style workflows can be built on top.
A cute systemd feature to get the system clock roughly correct: if the system time is before the compilation time of the systemd binary, it moves the clock forward to that time!
I would have thought that invoking a C compiler would be a solved problem. Looking at Rust's cc crate there's a remarkable long tail of corner cases to fix.
Exotic CPUs, microarchitectures, compiler differences, operating system differences, etc.