Struct SamplerCost 

pub struct SamplerCost {
    pub cpu_s: Option<f64>,
    pub wall_s: f64,
    pub samples: usize,
    pub rejected_lines: u64,
}

2026-09-26: What the sampler itself cost, written to the record as gpu_rail_sample* keys so the instrument’s overhead is visible.

Fields

cpu_s: Option<f64>

2026-09-26: CPU seconds the sampler child consumed, from the first field of /proc/<pid>/schedstat read as nanoseconds. None when procfs could not be read.

wall_s: f64

2026-09-26: Wall seconds it ran.

samples: usize

2026-09-26: Readings it produced.

rejected_lines: u64

2026-09-26: Lines it emitted that did not parse as a reading, such as an [N/A] watt cell. Written to the record when non-zero.

Implementations

impl SamplerCost

pub fn metrics(&self, m: &mut BTreeMap<String, f64>)

pub fn one_line(&self) -> String

Trait Implementations

impl Clone for SamplerCost

fn clone(&self) -> SamplerCost

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SamplerCost

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

Formats the value using the given formatter.

impl Default for SamplerCost

fn default() -> SamplerCost

Returns the “default value” for a type.

impl PartialEq for SamplerCost

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for SamplerCost

impl StructuralPartialEq for SamplerCost