‑Xenableexplicitgc / ‑Xdisableexplicitgc
Enables and disables garbage collection (GC) when calls are made to System.gc().
Syntax
| Setting | Effect | Default |
|---|---|---|
-Xenableexplicitgc |
Enable explicit GC calls | yes |
-Xdisableexplicitgc |
Disable explicit GC calls |
Explanation
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 OpenJ9 GC policies is -Xenableexplicitgc except for -Xgcpolicy:nogc, where the default is -Xdisableexplicitgc.