ZGC - Paving the GC On-Ramp
summary
ZGC is a concurrent, low‑latency collector claiming submillisecond pauses and terabyte heap scalability; a generational ZGC is shipping to isolate young collections and avoid scanning large old heaps. Automatic heap sizing starts from 16 MB, grows quickly, and balances resources with weak GC and strong GC forces to avoid allocation stalls and OOMs. Concurrent priming pages memory and enables large pages for roughly +15% throughput, and a new mapped‑cache reduces virtual mappings so kernel tuning becomes unnecessary.
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chapters (9)
- 0:00Introduction to ZGC
- 3:37Paving the GC on-ramp
- 6:16Configurability and trade-offs
- 11:02Manual heap sizing challenges
- 13:40Automatic heap sizing
- 24:26Large page trade-offs
- 29:49Concurrent priming
- 32:49Mapping and memory efficiency
- 34:51Conclusion and Q&A
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