Struct WidthPolicy 

pub struct WidthPolicy {
    pub serial_below_ns: f64,
    pub entry_base_ns: f64,
    pub entry_per_thread_ns: f64,
}

Cost model for choosing a barrier-free partition width from the work.

T_par(k) = entry_base_ns + entry_per_thread_ns * k + serial_ns / k for k > 1; work below serial_below_ns always runs serially. The defaults are provisional values from experiments/rayon-entry (M5 Max, 2026-09-29); kernels replace them with their own measured policy.

Examples

let p = tcontract_exec::WidthPolicy::default();
assert_eq!(p.serial_below_ns, 50_000.0);

Fields

serial_below_ns: f64

Estimated serial time below which work never leaves the caller.

entry_base_ns: f64

Fixed part of the pool entry cost.

entry_per_thread_ns: f64

Entry cost added per participating worker.

Trait Implementations

impl Clone for WidthPolicy

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for WidthPolicy

impl Debug for WidthPolicy

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

Formats the value using the given formatter.

impl Default for WidthPolicy

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for WidthPolicy

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for WidthPolicy