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-Xmr /   -Xmrx

Sets the initial and maximum size of the the garbage collection "remembered set", which is a list of objects in the old (tenured) heap that have references to objects in the new area.

Syntax

Setting Effect Default
-Xmr<size> Set initial size 16 K
-Xmrx<size> Set maximium size

See Using -X command-line options for more information about the <size> parameter.