perf_hooks.importHistogram

History

perf_hooks.importHistogram(data): RecordableHistogram

Attributes

data:Uint8Array

A CBOR-encoded histogram previously produced by histogram.export().

Returns:RecordableHistogram

Reconstructs a histogram from a CBOR-encoded Uint8Array. The returned histogram is a full RecordableHistogram with all bucket data, configuration, and EWMA state restored. New values can be recorded into it.

const { createHistogram, importHistogram } = require('node:perf_hooks');

const h = createHistogram();
for (let i = 1; i <= 1000; i++) h.record(i);

// Serialize and reconstruct
const data = h.export();
const h2 = importHistogram(data);

console.log(h2.count);          // 1000
console.log(h2.percentile(99)); // Same as h.percentile(99)

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