Run results for: Buffer Access

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.109 Safari/537.36

Browser: Chrome 98

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
DataView AoS	3622.9 Ops/sec
DataView byte-aligned AoS	3421.1 Ops/sec
TypedArray AoS	124885.9 Ops/sec
TypedArray byte-aligned AoS	148594.4 Ops/sec
TypedArray SoA	5238.2 Ops/sec

Script Preparation code:

var bench1buffer;
var bench2buffer;
var bench3buffer;
{
    const stride = 10;
    bench1buffer = new ArrayBuffer(stride * 1000);
    /*
      0 u16 id
      2 f32 x
      6 f32 y
    */
    for (let i = 0; i < 1000; i++) {
        const struct = new DataView(bench1buffer, i * stride, stride);
        struct.setUint16(0, i);
        struct.setFloat32(2, i);
        struct.setFloat32(6, i * 2);
    }
}
{
    const stride = 12;
    bench2buffer = new ArrayBuffer(stride * 1000);
    /*
      0 u16 id
      4 f32 x
      8 f32 y
    */
    const floats = new Float32Array(bench2buffer);
    const u16s = new Uint16Array(bench2buffer);
    for (let i = 0; i < 1000; i++) {
        u16s[i * stride] = i;
        floats[i * stride + 4] = i;
        floats[i * stride + 8] = i * 2;
    }
}
{
    bench3buffer = {
        id: new Uint16Array(1000),
        x: new Float32Array(1000),
        y: new Float32Array(1000),
    };
    for (let i = 0; i < 1000; i++) {
        bench3buffer.id[i] = i;
        bench3buffer.x[i] = i;
        bench3buffer.y[i] = i * 2;
    }
}

Tests:

DataView AoS
const stride = 10; /* 0 u16 id 2 f32 x 6 f32 y */ let sum = 0; for (let i = 0; i < 1000; i++) { const struct = new DataView(bench1buffer, i * stride, stride); const id = struct.getUint16(0); const x = struct.getFloat32(2); const y = struct.getFloat32(6); sum += id + x * y; }
DataView byte-aligned AoS
const stride = 12; /* 0 u16 id 4 f32 x 8 f32 y */ let sum = 0; for (let i = 0; i < 1000; i++) { const struct = new DataView(bench2buffer, i * stride, stride); const id = struct.getUint16(0); const x = struct.getFloat32(4); const y = struct.getFloat32(8); sum += id + x * y; }
TypedArray AoS
const stride = 10; /* 0 u16 id 2 f32 x 6 f32 y */ let floats = new Float32Array(bench1buffer); let u32s = new Uint32Array(bench1buffer); let sum = 0; for (let i = 0; i < 1000; i++) { const offset = i * stride; const id = floats[offset]; const x = floats[offset + 2]; const y = floats[offset + 6]; sum += id + x * y; }
TypedArray byte-aligned AoS
const stride = 12; /* 0 u16 id 4 f32 x 8 f32 y */ let floats = new Float32Array(bench2buffer); let u32s = new Uint32Array(bench2buffer); let sum = 0; for (let i = 0; i < 1000; i++) { const offset = i * stride; const id = floats[offset]; const x = floats[offset + 4]; const y = floats[offset + 8]; sum += id + x * y; }
TypedArray SoA
let sum = 0; for (let i = 0; i < 1000; i++) { const id = bench3buffer.id[i]; const x = bench3buffer.x[i]; const y = bench3buffer.y[i]; sum += id + x * y; }

Run results for: Buffer Access

DataView AoS

DataView byte-aligned AoS

TypedArray AoS

TypedArray byte-aligned AoS

TypedArray SoA