Benchmark: uint8array - MeasureThat.net

Script Preparation code:

var arr = new Uint8Array(999000);
for (var i = 0; i < arr.length; i++) arr[i] = 3;

Tests:

a
var arrA = new Uint8ClampedArray(arr.buffer);
b
var arrB = new Uint8ClampedArray(arr);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
a
b

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Browser/OS: Chrome 126 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
a	5112090.5 Ops/sec
b	868.4 Ops/sec

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

LLMs can make mistakes. Check important info.

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

**What is being tested?**

The benchmark is testing the performance difference between creating a new `Uint8ClampedArray` instance with a shared buffer (`arr.buffer`) versus passing the entire array as an argument to the constructor (`new Uint8ClampedArray(arr)`).

In other words, the question is: "Is it faster to create a new `Uint8ClampedArray` instance with a reference to the original array's buffer, or by passing the entire original array as an argument?"

**Options being compared**

There are two options being compared:

1. **Shared buffer**: Creating a new `Uint8ClampedArray` instance with a shared buffer (`arr.buffer`). This means that the constructor takes ownership of the original array's data and creates a new view into it.
2. **Passing the entire array**: Passing the entire original array as an argument to the constructor (`new Uint8ClampedArray(arr)`). This means that each `Uint8ClampedArray` instance has its own copy of the data.

**Pros and Cons**

**Shared buffer:**

Pros:

* Can be more efficient in terms of memory allocation, as only a single buffer needs to be allocated.
* Can be faster, since the constructor doesn't need to create a new copy of the data.

Cons:

* Requires careful management of the original array's lifetime, to avoid memory leaks or crashes when the arrays are garbage collected.
* May not work correctly if the original array is modified after creation, as it can affect the entire `Uint8ClampedArray` instance.

**Passing the entire array:**

Pros:

* Is simpler to use and manage, since each `Uint8ClampedArray` instance has its own copy of the data.
* Works correctly even if the original array is modified, since each `Uint8ClampedArray` instance has its own independent copy of the data.

Cons:

* Requires more memory allocation, as multiple buffers need to be allocated for each `Uint8ClampedArray` instance.
* May be slower, since the constructor needs to create a new copy of the data.

**Library and purpose**

In this case, there is no explicit library being used. However, it's worth noting that creating a `Uint8ClampedArray` instance with a shared buffer or by passing the entire array as an argument is a common pattern in JavaScript performance optimization, particularly when working with large arrays of binary data.

**Special JS feature or syntax**

There are no special features or syntax being used in this benchmark. The code is standard JavaScript, using only basic language constructs and built-in types.

**Other alternatives**

If you're interested in exploring alternative approaches to creating `Uint8ClampedArray` instances, here are a few options:

* Using the `Buffer` class: Instead of passing an array as an argument, you can pass a buffer object directly to the constructor.
* Using `TypedArrays`: Some browsers support typed arrays with additional features, such as `Uint8TypedArray` or `Float32Array`. These types may offer better performance or more flexibility than `Uint8ClampedArray`.
* Using native WebAssembly modules: If you're targeting modern web browsers that support WebAssembly, you can create binary data using the WebAssembly module API and then use `Uint8Array` to work with it.

Keep in mind that these alternatives may have their own trade-offs and requirements, and may not be suitable for every use case.

Related benchmarks:

uint8array (version: 0)

Comparing performance of: a vs b

Created: 8 years ago by: Guest

Jump to the latest result

a

b

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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