IBM User Guide for Java V7 on Windows > Reference > Command-line options > Garbage Collector command-line options

-Xmo

Sets the initial and maximum size of the old (tenured) heap to the specified value when using -Xgcpolicy:gencon.

-Xmo<size>

Equivalent to setting both -Xmos and -Xmox. If you set either -Xmos or -Xmox, you cannot set -Xmo. If you try to set -Xmo with either -Xmos or -Xmox, the VM does not start, returning an error. By default, -Xmo is not set.

Parent: Garbage Collector command-line options

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