Benchmark: Dataview vs Custom - Read uint32

Script Preparation code:

    var totalValues = 1024 * 1024;
	var valueSize = 4;
	var totalBytes = totalValues * valueSize;
	var buffer = new ArrayBuffer(totalBytes);
	// fill
	var dv = new DataView(buffer);
	for (i=0; i<totalBytes; i+=valueSize) {
	   num = Math.floor(Math.random()*Math.pow(2,8*valueSize));
	   dv.setUint32(i,num,true);
	}
	
	function readUnsignedInt(stream){
		var l=stream[seek]+stream[seek+1]*256+stream[seek+2]*65536+stream[seek+3]*16777216;
		seek=seek+4;
		return l;
	}
	
	var seek=0;
	var stream = new Uint8Array(buffer);

Tests:

Dataview
for (i=0; i<totalBytes; i+=valueSize) { num = dv.getUint32(i,true); }
Custom
for (i=0; i<totalBytes; i+=valueSize) { num = readUnsignedInt(stream); }
Basecase - Just loop
for (i=0; i<totalBytes; i+=valueSize) { }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Dataview
Custom
Basecase - Just loop

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 6 years ago)

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36

Browser/OS: Chrome 66 on Windows 7

View result in a separate tab

Test name	Executions per second
Dataview	2.1 Ops/sec
Custom	1.0 Ops/sec
Basecase - Just loop	6.5 Ops/sec

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

LLMs can make mistakes. Check important info.

Measuring performance of different JavaScript approaches can be challenging due to the complex nature of the language.

Let's break down what is being tested in this benchmark:

**What is being measured?**

The benchmark measures the execution time of three different approaches for reading a `uint32` value from a buffer:

1. **Dataview**: Using the `DataView` API, which provides a way to directly access and manipulate binary data.
2. **Custom**: Implementing a custom function to read the `uint32` value from the buffer using bitwise operations.
3. **Basecase - Just loop**: A minimalistic approach that only loops through the bytes of the buffer without any optimizations.

**Options compared**

The benchmark compares the performance of these three approaches:

* **Pros and Cons:**
	+ **Dataview**: Fast and efficient, as it provides direct access to the binary data. However, it may not be available in older browsers or engines.
	+ **Custom**: Custom implementation can provide good performance, but it requires more code and manual optimization. It's also dependent on the specific browser engine's support for bitwise operations.
	+ **Basecase - Just loop**: The simplest approach, which is easy to understand and implement. However, it may be slower due to the lack of optimizations.

**Library used**

The `DataView` API is a part of the Web API and is widely supported by modern browsers. It provides a way to access and manipulate binary data in an efficient manner.

**Special JS feature or syntax**

There's no specific JavaScript feature or syntax being tested, but the use of bitwise operations (`uint32` value) is relevant to understanding the performance differences between these approaches.

**Other alternatives**

If you're interested in exploring alternative approaches or libraries for reading `uint32` values from buffers, consider:

* Using a library like `buffer-to-integer` which provides a simple way to convert binary data to integers.
* Implementing custom bitwise operations using `Buffer` objects and integer arithmetic.
* Using other APIs like `TypedArray` or `Uint8ClampedArray`, although their performance might vary depending on the browser engine.

Please keep in mind that this benchmark focuses specifically on reading `uint32` values from buffers, so it's essential to tailor your exploration of alternative approaches to this specific use case.

Related benchmarks:

Dataview vs Custom - Read uint32 (version: 2)

Comparing performance of: Dataview vs Custom vs Basecase - Just loop

Created: 7 years ago by: Registered User

Jump to the latest result

Dataview

Custom

Basecase - Just loop

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):