CPU Cache Hit-Rate / AMAT Calculator implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t4-288

Effect

Computation or source lookup only

Input and validation requirements

The extreme-magnitude vector overflows finite JavaScript arithmetic to Infinity, and the convention probe produces radically different results unless percentage versus fractional miss-rate input is explicitly disambiguated.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "levels": 1,
    "hit_time_ns": 1,
    "miss_rate": 0.05,
    "miss_penalty_ns": 80
  },
  "expected_outputs": {
    "amat_ns": 5,
    "effective_speedup_vs_no_cache": null
  },
  "working": "AMAT = hit_time + miss_rate × miss_penalty\n= 1 ns + 0.05 × 80 ns\n= 1 ns + 4 ns\n= 5 ns.\nSpeedup is unavailable because no no-cache baseline is specified."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche4/tranche4-results.json