build(deps): bump fastify

[poolifier.git] / src / utils.ts

diff --git a/src/utils.ts b/src/utils.ts
index 25233a022aac69f9db858907261ad6720e5e495e..f7aab63746e274b328d606fb3659a5353e796132 100644 (file)
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -1,7 +1,8 @@
 import * as os from 'node:os'
-import { getRandomValues } from 'node:crypto'
+import { getRandomValues, randomInt } from 'node:crypto'
 import { Worker as ClusterWorker } from 'node:cluster'
 import { Worker as ThreadWorker } from 'node:worker_threads'
+import { cpus } from 'node:os'
 import type {
   InternalWorkerChoiceStrategyOptions,
   MeasurementStatisticsRequirements
@@ -22,16 +23,16 @@ export const EMPTY_FUNCTION: () => void = Object.freeze(() => {
 })
 
 /**
- * Default worker choice strategy options.
+ * Gets default worker choice strategy options.
  *
- * @param poolMaxSize - The pool maximum size.
+ * @param retries - The number of worker choice retries.
  * @returns The default worker choice strategy options.
  */
-export const getDefaultInternalWorkerChoiceStrategyOptions = (
-  poolMaxSize: number
+const getDefaultInternalWorkerChoiceStrategyOptions = (
+  retries: number
 ): InternalWorkerChoiceStrategyOptions => {
   return {
-    retries: poolMaxSize,
+    retries,
     runTime: { median: false },
     waitTime: { median: false },
     elu: { median: false }
@@ -280,3 +281,52 @@ export const once = <T, A extends any[], R>(
     return result
   }
 }
+
+const clone = <T extends object>(object: T): T => {
+  return JSON.parse(JSON.stringify(object)) as T
+}
+
+export const buildInternalWorkerChoiceStrategyOptions = (
+  poolMaxSize: number,
+  opts?: InternalWorkerChoiceStrategyOptions
+): InternalWorkerChoiceStrategyOptions => {
+  opts = clone(opts ?? {})
+  if (opts?.weights == null) {
+    opts.weights = getDefaultWeights(poolMaxSize)
+  }
+  return {
+    ...getDefaultInternalWorkerChoiceStrategyOptions(
+      poolMaxSize + Object.keys(opts.weights).length
+    ),
+    ...opts
+  }
+}
+
+const getDefaultWeights = (
+  poolMaxSize: number,
+  defaultWorkerWeight?: number
+): Record<number, number> => {
+  defaultWorkerWeight = defaultWorkerWeight ?? getDefaultWorkerWeight()
+  const weights: Record<number, number> = {}
+  for (let workerNodeKey = 0; workerNodeKey < poolMaxSize; workerNodeKey++) {
+    weights[workerNodeKey] = defaultWorkerWeight
+  }
+  return weights
+}
+
+const getDefaultWorkerWeight = (): number => {
+  const cpuSpeed = randomInt(500, 2500)
+  let cpusCycleTimeWeight = 0
+  for (const cpu of cpus()) {
+    if (cpu.speed == null || cpu.speed === 0) {
+      cpu.speed =
+        cpus().find(cpu => cpu.speed != null && cpu.speed !== 0)?.speed ??
+        cpuSpeed
+    }
+    // CPU estimated cycle time
+    const numberOfDigits = cpu.speed.toString().length - 1
+    const cpuCycleTime = 1 / (cpu.speed / Math.pow(10, numberOfDigits))
+    cpusCycleTimeWeight += cpuCycleTime * Math.pow(10, numberOfDigits)
+  }
+  return Math.round(cpusCycleTimeWeight / cpus().length)
+}