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‑Xenableexplicitgc / ‑Xdisableexplicitgc

Enables and disables garbage collection (GC) when calls are made to System.gc().


Setting Effect Default
-Xenableexplicitgc Enable explicit GC calls yes
-Xdisableexplicitgc Disable explicit GC calls


Although it is possible to programmatically trigger a global GC by calling System.gc(), performance can be adversely affected by halting the application before it is really necessary. Use this option to prevent the VM responding to application requests for a GC cycle.

The default for all Eclipse OpenJ9™ GC policies is -Xenableexplicitgc except for -Xgcpolicy:nogc, where the default is -Xdisableexplicitgc.

These options can be used with all OpenJ9 GC policies.