Enum mmtk::util::options::NurserySize

pub enum NurserySize {
    Bounded {
        min: usize,
        max: usize,
    },
    ProportionalBounded {
        min: f64,
        max: f64,
    },
    Fixed(usize),
}

An option that provides a min/max interface to MMTk and a Bounded/Fixed interface to the user/VM.

Variants

Bounded

Fields

min: usize

The lower bound of the nursery size in bytes. Default to DEFAULT_MIN_NURSERY.

max: usize

The upper bound of the nursery size in bytes. Default to DEFAULT_MAX_NURSERY.

A Bounded nursery has different upper and lower bounds. The size only controls the upper bound. Hence, it is considered to be a “variable size” nursery.

ProportionalBounded

Fields

min: f64

The lower bound of the nursery size as a proportion of the current heap size. Default to DEFAULT_PROPORTIONAL_MIN_NURSERY.

max: f64

The upper bound of the nursery size as a proportion of the current heap size. Default to DEFAULT_PROPORTIONAL_MAX_NURSERY.

A bounded nursery that is porportional to the current heap size.

Fixed(usize)

A Fixed nursery has the same upper and lower bounds. The size controls both the upper and lower bounds. Note that this is considered less performant than a Bounded nursery since a Fixed nursery size can be too restrictive and cause more GCs.

Implementations

impl NurserySize

fn validate(&self) -> bool

Return true if the values are valid.

Trait Implementations

impl Clone for NurserySize

fn clone(&self) -> NurserySize

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for NurserySize

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl FromStr for NurserySize

type Err = String

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type.

impl Copy for NurserySize