MeasureThat.net

Run results for: copy ArrayBuffer: DataView vs Uint8Array.set vs Float64Array.set vs by bytes vs function

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Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.5060.66 Safari/537.36
Chrome 103
Windows
Desktop
2 years ago
Test name Executions per second
DataView 13752860.0 Ops/sec
Uint8Array by byte 13879972.0 Ops/sec
Uint8Array with set 859023.6 Ops/sec
with Float64Array 584556.6 Ops/sec
function copy 21093.6 Ops/sec
Script Preparation code:
​x
 
var size = 0xFFFF;
var buf = new ArrayBuffer(size);
var view = new DataView(buf);
var byte = new Uint8Array(buf);
​
var data = new Uint8Array(size);
​
for (let i = 0; i < size; i++) {
    data[i] = 100*Math.random();
}
​
function copy(dst, src, size) {
  for (let i=0;i<size;i++)dst[i]=src[i];
}
Tests:

  • DataView

     
    for (let i; i < size; i++) {
        view.setUint8(i, data[i]);
    }

  • Uint8Array by byte

     
    for (let i; i < size; i++) {
        byte[i] = data[i];
    }

  • Uint8Array with set

     
    byte.set(data);

  • with Float64Array

     
    (new Float64Array(buf, 0, size/8))
          .set(new Float64Array(data.buffer, 0, size/8));

  • function copy

     
    copy(byte, data, data.length)
    ​