Benchmark: Zero-fill Uint8Array

Script Preparation code:

var size = 1080 * 720;
var globalArray = new Uint8Array(size);

Tests:

Native fill
globalArray.fill(0);
Fill with loop
var n = size; while(n--) globalArray[n] = 0;
New array
globalArray = new Uint8Array(size);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Native fill
Fill with loop
New array

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 4 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.3 Safari/605.1.15

Browser/OS: Safari 17 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Native fill	155326.7 Ops/sec
Fill with loop	46.3 Ops/sec
New array	43876.2 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided JSON and explain what's being tested.

**Benchmark Overview**

The benchmark measures the performance of filling a `Uint8Array` with zeros using three different approaches: native `fill()`, fill using a loop, and creating a new array.

**Options Compared**

1. **Native `fill()`**: This method is part of the JavaScript standard library and directly fills the entire array with zeros.
2. **Fill with Loop**: This approach uses a while loop to iterate over each element in the array and sets it to zero individually.
3. **New Array**: This option creates a new, empty `Uint8Array` instance and assigns it to the global variable.

**Pros and Cons**

1. **Native `fill()`**:
	* Pros: Fast and efficient, as it's a built-in method optimized for performance.
	* Cons: May have limitations or quirks depending on the browser implementation.
2. **Fill with Loop**:
	* Pros: Can be useful for understanding low-level array manipulation.
	* Cons: Slower than native `fill()` due to the overhead of the loop and individual assignments.
3. **New Array**:
	* Pros: May be useful for demonstrating array creation and reuse.
	* Cons: Creates a new, unnecessary object, which can lead to increased memory allocation and garbage collection.

**Library/Extension**

In this benchmark, no external libraries are used. However, the `Uint8Array` class is a built-in JavaScript class that represents an array of unsigned 8-bit integers.

**Special JS Feature/Syntax**

There are no special JavaScript features or syntax mentioned in this benchmark. It's purely focused on measuring performance.

**Other Alternatives**

If you wanted to test alternative approaches, you could consider:

* Using `Buffer.fill()` (for Node.js) or `TypedArray.prototype.fill()` (for modern browsers)
* Implementing a custom loop-based fill function
* Using WebAssembly (WASM) or other low-level optimization techniques

In summary, this benchmark measures the performance of three different approaches to filling a `Uint8Array` with zeros: native `fill()`, fill using a loop, and creating a new array. The results provide insight into which approach is most efficient for this specific use case.

Related benchmarks:

Zero-fill Uint8Array (version: 2)

Comparing performance of: Native fill vs Fill with loop vs New array

Created: 7 years ago by: Registered User

Jump to the latest result

Native fill

Fill with loop

New array

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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