Struct SwimConfig 

pub struct SwimConfig {
    pub indirect_probes: u32,
    pub suspicion_periods_base: Tick,
    pub ns_dilation: Tick,
    pub ns_max: u32,
    pub refutation_enabled: bool,
}

Tunables for the SWIM + Lifeguard state machine. The defaults mirror the Lifeguard paper’s recommended shape (small k, a suspicion timeout that is a small multiple of the probe period, scaled logarithmically by cluster size).

Fields

indirect_probes: u32

Number of indirect probers per period (k). Not consumed by the pure state machine directly – the I/O shell uses it to pick fan-out – but recorded here so the whole knob set lives in one place.

suspicion_periods_base: Tick

Base suspicion timeout, in protocol periods, before the dogpile and nack-score adjustments. A lone suspicion on a healthy observer waits this long before confirming.

ns_dilation: Tick

Multiplier applied per unit of nack score when dilating the suspicion timeout: a slow observer (high NS) waits base * (1 + ns * dilation) periods. Setting this to 0 disables Lifeguard timeout dilation (used by the negative control in the DST model).

ns_max: u32

Maximum nack score. Caps how far a slow observer dilates.

refutation_enabled: bool

When false, a node cannot refute a suspicion by bumping its incarnation. This is NOT a production knob – it exists only so the DST model’s negative control can show that disabling refutation makes a live-but-slow node get falsely and permanently confirmed dead.

Trait Implementations

impl Clone for SwimConfig

fn clone(&self) -> SwimConfig

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for SwimConfig

impl Debug for SwimConfig

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

Formats the value using the given formatter.

impl Default for SwimConfig

fn default() -> Self

Returns the “default value” for a type.