runFate

@forge/monorepo

---

@forge/monorepo / backend/src / runFate

Function: runFate()

runFate(runId): object

Defined in: backend/src/loadtest/scenario.ts:106

Two stable, well-distributed fractions from a run id.

Stable because a resumed run must draw the same fate as its first attempt — Math.random() and a shared generator both fail at that, and a scenario that changes under a resume can make no claim about resumption.

Well-distributed because the first version was not, and it mattered. Plain FNV-1a with two different offset bases, taken as a raw fraction, gave 0.03 external-action rate for one id prefix and 0.50 for another against a configured 0.30 — the low bits are poorly mixed and two bases correlate. So: FNV-1a over a salted string, then murmur3's fmix32 avalanche. A biased traffic mix is a load test that measures a different workload than the one it reports, and nothing in the output would have said so.

Parameters

runId

string

Returns

object

a

readonly a: number

b

readonly b: number