perf_hooks: reduce overhead of createHistogram

benchmark/perf_hooks/histogram.js

@@ -0,0 +1,42 @@
+'use strict';
+
+const assert = require('assert');
+const common = require('../common.js');
+
+const { createHistogram } = require('perf_hooks');
+
+const bench = common.createBenchmark(main, {
+  n: [1e5],
+  operation: ['creation', 'clone'],
+});
+
+let _histogram;
+
+function main({ n, operation }) {
+  switch (operation) {
+    case 'creation': {
+      bench.start();
+      for (let i = 0; i < n; i++)
+        _histogram = createHistogram();
+      bench.end(n);
+
+      // Avoid V8 deadcode (elimination)
+      assert.ok(_histogram);
+      break;
+    }
+    case 'clone': {
+      const histogram = createHistogram();
+
+      bench.start();
+      for (let i = 0; i < n; i++)
+        _histogram = structuredClone(histogram);
+      bench.end(n);
+
+      // Avoid V8 deadcode (elimination)
+      assert.ok(_histogram);
+      break;
+    }
+    default:
+      throw new Error(`Unsupported operation ${operation}`);
+  }
+}

lib/internal/histogram.js

@@ -52,9 +52,13 @@ function isHistogram(object) {
   return object?.[kHandle] !== undefined;
 }
 
+const kSkipThrow = Symbol('kSkipThrow');
+
 class Histogram {
-  constructor() {
-    throw new ERR_ILLEGAL_CONSTRUCTOR();
+  constructor(skipThrowSymbol = undefined) {
+    if (skipThrowSymbol !== kSkipThrow) {
+      throw new ERR_ILLEGAL_CONSTRUCTOR();
+    }
   }
 
   [kInspect](depth, options) {
@@ -242,7 +246,7 @@ class Histogram {
     const handle = this[kHandle];
     return {
       data: { handle },
-      deserializeInfo: 'internal/histogram:internalHistogram',
+      deserializeInfo: 'internal/histogram:ClonedHistogram',
     };
   }
 
@@ -264,8 +268,12 @@ class Histogram {
 }
 
 class RecordableHistogram extends Histogram {
-  constructor() {
-    throw new ERR_ILLEGAL_CONSTRUCTOR();
+  constructor(skipThrowSymbol = undefined) {
+    if (skipThrowSymbol !== kSkipThrow) {
+      throw new ERR_ILLEGAL_CONSTRUCTOR();
+    }
+
+    super(skipThrowSymbol);
   }
 
   /**
@@ -309,7 +317,7 @@ class RecordableHistogram extends Histogram {
     const handle = this[kHandle];
     return {
       data: { handle },
-      deserializeInfo: 'internal/histogram:internalRecordableHistogram',
+      deserializeInfo: 'internal/histogram:ClonedRecordableHistogram',
     };
   }
 
@@ -318,26 +326,34 @@ class RecordableHistogram extends Histogram {
   }
 }
 
-function internalHistogram(handle) {
+function ClonedHistogram(handle) {
   return ReflectConstruct(
     function() {
       markTransferMode(this, true, false);
       this[kHandle] = handle;
       this[kMap] = new SafeMap();
     }, [], Histogram);
 }
-internalHistogram.prototype[kDeserialize] = () => {};
 
-function internalRecordableHistogram(handle) {
-  return ReflectConstruct(
-    function() {
-      markTransferMode(this, true, false);
-      this[kHandle] = handle;
-      this[kMap] = new SafeMap();
-      this[kRecordable] = true;
-    }, [], RecordableHistogram);
+ClonedHistogram.prototype[kDeserialize] = () => { };
+
+function ClonedRecordableHistogram(handle) {
+  const histogram = new RecordableHistogram(kSkipThrow);
+
+  markTransferMode(histogram, true, false);
+  histogram[kRecordable] = true;
+  histogram[kMap] = new SafeMap();
+  histogram[kHandle] = handle;
+  histogram.constructor = RecordableHistogram;
+
+  return histogram;
+}
+
+ClonedRecordableHistogram.prototype[kDeserialize] = () => { };
+
+function createRecordableHistogram(handle) {
+  return new ClonedRecordableHistogram(handle);
 }
-internalRecordableHistogram.prototype[kDeserialize] = () => {};
 
 /**
  * @param {{
@@ -363,14 +379,14 @@ function createHistogram(options = kEmptyObject) {
     throw new ERR_INVALID_ARG_VALUE.RangeError('options.highest', highest);
   }
   validateInteger(figures, 'options.figures', 1, 5);
-  return internalRecordableHistogram(new _Histogram(lowest, highest, figures));
+  return createRecordableHistogram(new _Histogram(lowest, highest, figures));
 }
 
 module.exports = {
   Histogram,
   RecordableHistogram,
-  internalHistogram,
-  internalRecordableHistogram,
+  ClonedHistogram,
+  ClonedRecordableHistogram,
   isHistogram,
   kDestroy,
   kHandle,

test/parallel/test-performance-function.js

@@ -90,8 +90,14 @@
 }
 
 (async () => {
+  let _deadCode;
+
   const histogram = createHistogram();
-  const m = (a, b = 1) => {};
+  const m = (a, b = 1) => {
+    for (let i = 0; i < 1e3; i++)
+      _deadCode = i;
+  };
+  assert.ok(_deadCode >= 0);
   const n = performance.timerify(m, { histogram });
   assert.strictEqual(histogram.max, 0);
   for (let i = 0; i < 10; i++) {
@@ -104,7 +110,7 @@
       code: 'ERR_INVALID_ARG_TYPE'
     });
   });
 })().then(common.mustCall());
 
 (async () => {
   const histogram = createHistogram();