Speaker Details

Jean-Philippe Bempel


Developer passionate by performance, runtimes (JVM, CLR) and Mechanical Sympathy supporter, Jean-Philippe has more than 8 years experience in low latency trading systems. Now, He brings his expertise on the JVM at Criteo in order to optimize resources on thousand node clusters.

Understanding Low Latency JVM GCs

Java Language

Since several years, the world of JVM GC evolved. A new kind of GC emerges: low latency GCs. Shenandoah is provided by Red Hat and now merged into OpenJDK, Oracle open sourced ZGC in OpenJDK since JDK 11 and Azul C4 is sill there.‚Äč

As "classical" GCs are well understood, this talk will focus on internals of the most recent ones. We will explain Concurrent Marking (tri-color marking), the C4's Load Value Barrier, Shenandoah's Brooks Pointers and ZGC's multi-mapping.

Finally, how to choose a low latency GC?

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