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chronon::observe::DerivedFormula

Convenience formulas for common derived-counter patterns. More...

Attributes​

Name
autoRatio
a / (a + b) — hit rate, miss rate, etc.
autoPerKilo
a * 1000 / b — MPKI and similar per-kilo-instruction metrics.
autoDivide
a / b — IPC, throughput, etc.

Detailed Description​

Convenience formulas for common derived-counter patterns.

Example:

DerivedCounter hit_rate_{this, "hit_rate", "Hit rate",
    {hits_, misses_}, DerivedFormula::Ratio};

Attributes Documentation​

variable Ratio​

auto Ratio = [](std::span<const uint64_t> v) -> double {
    uint64_t d = v[0] + v[1];
    return d > 0 ? static_cast<double>(v[0]) / d : 0.0;
};

a / (a + b) — hit rate, miss rate, etc.

variable PerKilo​

auto PerKilo = [](std::span<const uint64_t> v) -> double {
    return v[1] > 0 ? static_cast<double>(v[0]) * 1000.0 / v[1] : 0.0;
};

a * 1000 / b — MPKI and similar per-kilo-instruction metrics.

variable Divide​

auto Divide = [](std::span<const uint64_t> v) -> double {
    return v[1] > 0 ? static_cast<double>(v[0]) / v[1] : 0.0;
};

a / b — IPC, throughput, etc.

Updated on 2026-05-26 at 05:42:32 +0000