perf_hooks: reduce overhead of createHistogram

H4ad · RafaelGSS · commit 72aabe113990 · 2024-04-10T13:17:54.000-03:00
PR-URL: #50074 Backport-PR-URL: #51306 Reviewed-By: Stephen Belanger <admin@stephenbelanger.com> Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
diff --git a/benchmark/perf_hooks/histogram-clone.js b/benchmark/perf_hooks/histogram-clone.js
@@ -0,0 +1,24 @@
+'use strict';
+
+const assert = require('assert');
+const common = require('../common.js');
+
+const { createHistogram } = require('perf_hooks');
+
+const bench = common.createBenchmark(main, {
+  n: [1e5],
+});
+
+let _histogram;
+
+function main({ n }) {
+  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);
+}
diff --git a/benchmark/perf_hooks/histogram-create.js b/benchmark/perf_hooks/histogram-create.js
@@ -0,0 +1,22 @@
+'use strict';
+
+const assert = require('assert');
+const common = require('../common.js');
+
+const { createHistogram } = require('perf_hooks');
+
+const bench = common.createBenchmark(main, {
+  n: [1e5],
+});
+
+let _histogram;
+
+function main({ n }) {
+  bench.start();
+  for (let i = 0; i < n; i++)
+    _histogram = createHistogram();
+  bench.end(n);
+
+  // Avoid V8 deadcode (elimination)
+  assert.ok(_histogram);
+}
diff --git a/lib/internal/histogram.js b/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',
     };
   }
 
@@ -318,24 +326,32 @@ class RecordableHistogram extends Histogram {
   }
 }
 
-function internalHistogram(handle) {
+function ClonedHistogram(handle) {
   return makeTransferable(ReflectConstruct(
     function() {
       this[kHandle] = handle;
       this[kMap] = new SafeMap();
     }, [], Histogram));
 }
-internalHistogram.prototype[kDeserialize] = () => {};
 
-function internalRecordableHistogram(handle) {
-  return makeTransferable(ReflectConstruct(
-    function() {
-      this[kHandle] = handle;
-      this[kMap] = new SafeMap();
-      this[kRecordable] = true;
-    }, [], RecordableHistogram));
+ClonedHistogram.prototype[kDeserialize] = () => { };
+
+function ClonedRecordableHistogram(handle) {
+  const histogram = new RecordableHistogram(kSkipThrow);
+
+  histogram[kRecordable] = true;
+  histogram[kMap] = new SafeMap();
+  histogram[kHandle] = handle;
+  histogram.constructor = RecordableHistogram;
+
+  return makeTransferable(histogram);
+}
+
+ClonedRecordableHistogram.prototype[kDeserialize] = () => { };
+
+function createRecordableHistogram(handle) {
+  return new ClonedRecordableHistogram(handle);
 }
-internalRecordableHistogram.prototype[kDeserialize] = () => {};
 
 /**
  * @param {{
@@ -361,14 +377,14 @@ 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,
