The Garbage Collector: Pacing, Assists, GOMEMLIMIT, and Green Tea
Measure GC frequency, pauses, assists, and the tradeoffs expressed by GOGC and GOMEMLIMIT.
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What this chapter teaches
GC pauses are the cost, and you fix GC latency by tuning GOGC.
Go's GC is concurrent, with stop-the-world phases and concurrent work that can affect CPU and latency. GC assists are one source: allocating goroutines may perform marking work. Allocation volume, retained heap, roots, scan work, and pacing settings can all matter. GOMEMLIMIT is a soft runtime-memory limit, not an OOM guarantee; GOGC=off without it allows automatic GC-driven heap reclamation to stop.
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