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About our C4 Garbage Collector

Azul’s Continuously Concurrent Compacting Collector (C4) is the only production-ready, generational pauseless garbage collector available in Java and a key component of Azul Platform Prime. Azul Systems has been shipping a production implementation of the C4 collector mechanism since 2010 and many Fortune 500 companies run their code on C4 today.

C4 uses a read barrier to support:


Concurrent Compaction


Concurrent Remapping


Concurrent Incremental Update Tracing

Download a pauseless GC whitepaper to learn more.