Further work

server/services/collectors/cgroups.js

@@ -25,6 +25,14 @@ import logger from '../../utils/logger.js'
 
 const log = logger.child('cgroups')
 
+const HOST_CPUS = (() => {
+  try {
+    return os.cpus().length || 1
+  } catch {
+    return 1
+  }
+})()
+
 export function isCgroupsEnabled() {
   const v = process.env.PEARDATA_CGROUPS
   if (v === '0' || v === 'off' || v === 'false') return false
@@ -241,7 +249,7 @@ export class CgroupsCollector extends EventEmitter {
     const ts = Date.now()
     const dtSec = this.lastTs ? (ts - this.lastTs) / 1000 : this.intervalMs / 1000
     this.lastTs = ts
-    const ncpu = os.cpus().length || 1
+    const ncpu = HOST_CPUS
     /** @type {Array<{ chart: string, context: string, ts: number, values: object }>} */
     const batch = []
 

server/services/collectors/processes.js

@@ -30,18 +30,18 @@ export function isProcessCollectorEnabled() {
   return os.platform() === 'linux'
 }
 
-function topN() {
-  const n = Number(process.env.PEARDATA_PROCESSES_TOP)
-  return Number.isFinite(n) && n > 0 ? Math.min(32, Math.floor(n)) : 8
-}
-
-function hostCpus() {
+const HOST_CPUS = (() => {
   try {
     return os.cpus().length || 1
   } catch {
     return 1
   }
-}
+})()
+
+const PROC_LIMIT = (() => {
+  const n = Number(process.env.PEARDATA_PROCESSES_TOP)
+  return Number.isFinite(n) && n > 0 ? Math.min(32, Math.floor(n)) : 8
+})()
 
 function sanitizeDim(name) {
   const s = String(name || 'unknown')
@@ -68,6 +68,7 @@ export function listProcStats() {
   }
   procTickCount = (procTickCount + 1) % PROC_EXTRA_TICK
   const readExtra = procTickCount === 0
+  if (readExtra) PROC_EXTRA_CACHE.clear()
 
   /** @type {Array<{ pid: number, name: string, utime: number, stime: number, rssPages: number, threads: number, readBytes: number|null, writeBytes: number|null }>} */
   const out = []
@@ -141,7 +142,7 @@ function pageSize() {
  * @param {'cpu'|'rss'|'io'|'threads'} kind
  */
 function registerTopChart(names, kind) {
-  const dims = [...new Set(names)].slice(0, topN()).map((id) => ({
+  const dims = [...new Set(names)].slice(0, PROC_LIMIT).map((id) => ({
     id,
     name: id,
     algorithm: 'absolute',
@@ -211,7 +212,7 @@ function registerTopChart(names, kind) {
 export class ProcessCollector extends EventEmitter {
   constructor(opts = {}) {
     super()
-    this.intervalMs = opts.intervalMs || Number(process.env.PEARDATA_SAMPLE_MS) || SAMPLE_INTERVAL_MS
+    this.intervalMs = opts.intervalMs || Number(process.env.PEARDATA_PROCESSES_MS) || Number(process.env.PEARDATA_SAMPLE_MS) || SAMPLE_INTERVAL_MS
     this._timer = null
     /** @type {Map<number, { ticks: number, wallMs: number, name: string, readBytes: number, writeBytes: number }>|null} */
     this._prev = null
@@ -221,7 +222,7 @@ export class ProcessCollector extends EventEmitter {
   start() {
     if (this._timer) return
     this._pageBytes = pageSize()
-    log.info('Process top-N collector started', { top: topN() })
+    log.info('Process top-N collector started', { top: PROC_LIMIT })
     this._tick()
     this._timer = setInterval(() => this._tick(), this.intervalMs)
     if (typeof this._timer.unref === 'function') this._timer.unref()
@@ -240,8 +241,8 @@ export class ProcessCollector extends EventEmitter {
       if (!procs) return
       const ts = Date.now()
       const wallMs = ts
-      const ncpu = hostCpus()
-      const limit = topN()
+      const ncpu = HOST_CPUS
+      const limit = PROC_LIMIT
 
       /** @type {Map<string, number>} */
       const cpuByName = new Map()