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James M Snell
b9e257f5cb
Cloning a histogram with `structuredClone()` or `postMessage()` shares the native histogram instead of copying it. Capturing the state of a histogram at a point in time, while other code keeps recording into it, requires serializing it with `export()` and parsing the result with `importHistogram()`. Add `histogram.snapshot()`, which returns a new, independent `Histogram` containing a copy of the histogram's configuration, recorded values, `exceeds` count, and EWMA state, without the serialization round trip. Values cannot be recorded into the returned histogram. The method is available on all histograms, including `RecordableHistogram` and `ELDHistogram` instances. Signed-off-by: James M Snell <jasnell@gmail.com> Assisted-by: OpenCode PR-URL: https://github.com/nodejs/node/pull/66099 Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
25 lines
577 B
JavaScript
25 lines
577 B
JavaScript
'use strict';
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const assert = require('assert');
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const common = require('../common.js');
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const { createHistogram } = require('perf_hooks');
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const bench = common.createBenchmark(main, {
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n: [1e3],
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highest: [1e6, Number.MAX_SAFE_INTEGER],
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figures: [2, 3],
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});
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let snapshot;
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function main({ n, highest, figures }) {
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const histogram = createHistogram({ highest, figures });
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for (let i = 1; i <= 1e4; i++) histogram.record(i);
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bench.start();
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for (let i = 0; i < n; i++) snapshot = histogram.snapshot();
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bench.end(n);
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assert.strictEqual(snapshot.count, 1e4);
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}
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