Benchmark: Buffer Access 2 - const arrays

Script Preparation code:

var bench1buffer;
var bench2buffer;
var bench3buffer;
var size = 1_000_000;
{
    const stride = 10;
    bench1buffer = new ArrayBuffer(stride * size);
    /*
      0 u16 id
      2 f32 x
      6 f32 y
    */
    for (let i = 0; i < size; i++) {
        const struct = new DataView(bench1buffer, i * stride, stride);
        struct.setUint16(0, i, true);
        struct.setFloat32(2, i, true);
        struct.setFloat32(6, i * 2, true);
    }
}
{
    const stride = 12;
    bench2buffer = new ArrayBuffer(stride * size);
    /*
      0 u16 id
      4 f32 x
      8 f32 y
    */
    for (let i = 0; i < size; i++) {
        const struct = new DataView(bench2buffer, i * stride, stride);
        struct.setUint16(0, i, true);
        struct.setFloat32(4, i, true);
        struct.setFloat32(8, i * 2, true);
    }
}
{
    bench3buffer = {
        id: new Uint16Array(size),
        x: new Float32Array(size),
        y: new Float32Array(size),
    };
    for (let i = 0; i < size; 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 < size; i++) { const struct = new DataView(bench1buffer, i * stride, stride); const id = struct.getUint16(0, true); const x = struct.getFloat32(2, true); const y = struct.getFloat32(6, true); sum += id + x * y; } console.log(1, sum);
DataView byte-aligned AoS
const stride = 12; /* 0 u16 id 4 f32 x 8 f32 y */ let sum = 0; for (let i = 0; i < size; i++) { const struct = new DataView(bench2buffer, i * stride, stride); const id = struct.getUint16(0, true); const x = struct.getFloat32(4, true); const y = struct.getFloat32(8, true); sum += id + x * y; } console.log(2, sum);
TypedArray byte-aligned AoS
const stride = 12; /* 0 u16 id 4 f32 x 8 f32 y */ const f32s = new Float32Array(bench2buffer); const u16s = new Uint16Array(bench2buffer); let sum = 0; for (let i = 0; i < size; i++) { const offset = i * stride; const id = u16s[offset / 2]; const x = f32s[offset / 4 + 1]; const y = f32s[offset / 4 + 2]; sum += id + x * y; } console.log(3, sum);
TypeArray SoA
let sum = 0; const idbuf = bench3buffer.id; const xbuf = bench3buffer.x; const ybuf = bench3buffer.y; for (let i = 0; i < size; i++) { const id = idbuf[i]; const x = xbuf[i]; const y = ybuf[i]; sum += id + x * y; } console.log(3, sum);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
DataView AoS
DataView byte-aligned AoS
TypedArray byte-aligned AoS
TypeArray SoA

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.102 Safari/537.36

Browser/OS: Chrome 98 on Windows

View result in a separate tab

Test name	Executions per second
DataView AoS	3.0 Ops/sec
DataView byte-aligned AoS	3.0 Ops/sec
TypedArray byte-aligned AoS	14.9 Ops/sec
TypeArray SoA	14.9 Ops/sec

Buffer Access 2 - const arrays (version: 0)

Comparing performance of: DataView AoS vs DataView byte-aligned AoS vs TypedArray byte-aligned AoS vs TypeArray SoA

Created: 2 years ago by: Guest

Jump to the latest result

DataView AoS

DataView byte-aligned AoS

TypedArray byte-aligned AoS

TypeArray SoA

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A