Struct AMXTimingConfig 

pub struct AMXTimingConfig {
    pub matrix_sizes: Vec<usize>,
    pub interleave_memory_ops: bool,
    pub von_neumann_debias: bool,
}

Configuration for AMX timing entropy collection.

Example

// Use defaults (recommended)
let config = AMXTimingConfig::default();

// Or customize
let config = AMXTimingConfig {
    matrix_sizes: vec![32, 128],       // only two sizes
    interleave_memory_ops: true,
    von_neumann_debias: true,
};

Fields

matrix_sizes: Vec<usize>

Matrix dimensions to cycle through for SGEMM dispatches.

Different sizes stress different AMX pipeline configurations:

• Small (16-32): register-bound, fast dispatch
• Medium (48-64): L1-cache-bound
• Large (96-128): L2/SLC-bound, higher memory bandwidth pressure

Must be non-empty. Each value is used as both M, N, and K dimensions.

Default: [16, 32, 48, 64, 96, 128]

interleave_memory_ops: bool

Interleave volatile memory reads/writes between AMX dispatches.

This thrashes a 64KB scratch buffer between matrix operations, disrupting the AMX pipeline state and preventing it from settling into a steady-state pattern. Increases min-entropy at the cost of slightly higher CPU usage.

Default: true

von_neumann_debias: bool

Apply Von Neumann debiasing to raw timing deltas.

The AMX timing source has severe bias (Shannon 6.985 but H∞ only 0.379). Von Neumann debiasing pairs consecutive deltas and discards equal pairs, emitting one unbiased bit per unequal pair. This costs ~50% of the raw data but dramatically improves min-entropy.

Default: true

Trait Implementations

impl Clone for AMXTimingConfig

fn clone(&self) -> AMXTimingConfig

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for AMXTimingConfig

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

Formats the value using the given formatter.

impl Default for AMXTimingConfig

fn default() -> Self

Returns the “default value” for a type.