Query and set the maximal size of the vector heap and the maximal
number of heap nodes for the current **R** process.

1 2 | ```
mem.maxVSize(vsize = 0)
mem.maxNSize(nsize = 0)
``` |

`vsize` |
numeric; new size limit in Mb. |

`nsize` |
numeric; new maximal node number. |

New Limits lower than current usage are ignored.
Specifying a size of `Inf`

sets the limit to the maximal possible
value for the platform.

The default maximal values are unlimited on most platforms, but can be
adjusted using environment variables as described in
`Memory`

. On macOS a lower default vector heap limit is
used to protect against the **R** process being killed when macOS
over-commits memory.

Adjusting the maximal number of nodes is rarely necessary. Adjusting the vector heap size limit can be useful on macOS in particular but should be done with caution.

The current or new value, in Mb for `mem.maxVSize`

. `Inf`

is
returned if the current value is unlimited.

`Memory`

.

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