Benchmark: DataView vs Uint32Array

Script Preparation code:

var size = 4 * 1000;
var buf = new ArrayBuffer(size);
var view = new DataView(buf);
var u32view = new Uint32Array(buf);

var data = [];

for (let i = 0; i < size/4; i++) {
	data[i] = 10000*Math.random();
}

Tests:

DataView
for (let i = 0, len = size/4; i < len; i++) { view.setUint32(i*4, data[i]); }
Uint32Array loop
for (let i = 0, len = size/4; i < len; i++) { u32view[i] = data[i]; }
Uint32Array set
u32view.set(data, 0)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
DataView
Uint32Array loop
Uint32Array set

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36

Browser/OS: Chrome 123 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
DataView	14014.7 Ops/sec
Uint32Array loop	15681.5 Ops/sec
Uint32Array set	968071.1 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's break down what's being tested in this benchmark.

**What is being tested?**

The benchmark is comparing the performance of three different approaches to write data into a `Uint32Array`:

1. **DataView**: Using the `DataView` class to create a view into an underlying ArrayBuffer, and then using the `setUint32` method to write 32-bit unsigned integers into the array.
2. **Uint32Array loop**: Creating a `Uint32Array` from the same ArrayBuffer as above, and then iterating over the array using a for loop to write each element individually.
3. **Uint32Array set**: Using the `set` method of the `Uint32Array` class to write all elements into the array at once.

**Options compared**

The benchmark is comparing the performance of these three approaches:

* **DataView with setUint32**: Uses the `setUint32` method to write data into the array.
* **Uint32Array loop**: Iterates over the array using a for loop to write each element individually.
* **Uint32Array set**: Uses the `set` method to write all elements into the array at once.

**Pros and cons of each approach**

* **DataView with setUint32**:
	+ Pros: Can be more efficient when writing large amounts of data, as it avoids iteration over the array. Additionally, it can provide better alignment and padding.
	+ Cons: Requires creating a `DataView` object, which can incur overhead in some cases.
* **Uint32Array loop**:
	+ Pros: Iterates directly over the elements of the array, avoiding any additional overhead of creating a view or using a set method. Also, allows for easier debugging and inspection of individual elements.
	+ Cons: Can be slower than using `setUint32` when writing large amounts of data, as it involves iteration over the array.
* **Uint32Array set**:
	+ Pros: Fastest way to write all elements into the array at once. Provides good performance for large datasets.
	+ Cons: Requires careful consideration of buffer alignment and padding to avoid issues with data corruption or truncation.

**Library/Tool**

The benchmark uses JavaScript's built-in `DataView` class, which provides a view into an underlying ArrayBuffer. The `Uint32Array` class is also used in conjunction with the `DataView`.

**Special JS feature/syntax**

There are no special JavaScript features or syntax used in this benchmark that would require additional explanation.

**Alternatives**

If you're interested in exploring alternative approaches to writing data into a `Uint32Array`, here are some options:

* Using a buffer-based approach, such as the `Buffer` class in Node.js.
* Using a library like WebAssembly, which provides more efficient memory management and caching.
* Using a different JavaScript engine or runtime environment that may optimize these operations differently.

Related benchmarks:

DataView vs Uint32Array (version: 0)

DataView vs Uint32Array

Comparing performance of: DataView vs Uint32Array loop vs Uint32Array set

Created: 4 years ago by: Guest

Jump to the latest result

DataView

Uint32Array loop

Uint32Array set

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):