Benchmark: array buffer to hex conversion

Script Preparation code:

var saltVal = crypto.getRandomValues(new Uint8Array(16));

function arrayBufferToHexString(bytes) {
    bytes = new Uint8Array(bytes);
    var hex = new Array(bytes.length);
    for (let i = 0; i < bytes.length; i++) {
        hex[i] = ("0" + bytes[i].toString(16)).slice(-2);
    }
    return hex.join("");
}

function bytesToHexString(bytes) {
    bytes = new Uint8Array(bytes);
    var hexBytes = [];
    for (var i = 0; i < bytes.length; i++) {
        var byteString = bytes[i].toString(16);
        if (byteString.length < 2) byteString = "0" + byteString;
        hexBytes.push(byteString);
    }
    return hexBytes.join("");
}

Tests:

directly set
arrayBufferToHexString(saltVal);
push values
bytesToHexString(saltVal)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
directly set
push values

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 18 days ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36 Edg/131.0.0.0

Browser/OS: Chrome 131 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
directly set	2726953.2 Ops/sec
push values	3599812.8 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 benchmark definition and test cases.

**What is being tested?**

The benchmark measures the performance of two approaches for converting an `ArrayBuffer` to a hexadecimal string:

1. **Directly setting**: The code sets the result of `arrayBufferToHexString(saltVal)` directly, without any intermediate steps.
2. **Pushing values**: The code uses the `bytesToHexString(saltVal)` function, which pushes each byte value onto an array before joining them into a string.

**Options compared**

The benchmark compares two options:

1. **Directly setting**: This approach sets the result directly, without any intermediate steps.
2. **Pushing values**: This approach uses an intermediate step to push each byte value onto an array before joining them into a string.

**Pros and cons of each approach:**

* **Directly setting**:
	+ Pros:
		- Simple and straightforward
		- Fewer memory allocations and copies
	+ Cons:
		- May require more CPU cycles due to the direct assignment
* **Pushing values**:
	+ Pros:
		- Can be more efficient in terms of memory allocation and copying, especially for large arrays
		- Allows for easy iteration and processing of each byte value individually
	+ Cons:
		- Requires an additional step, which can introduce overhead

**Library usage**

The benchmark uses the `crypto` library to generate a random `Uint8Array` (`saltVal`). The `crypto.getRandomValues()` function is used to generate cryptographically secure random values.

**Special JS feature or syntax**

None of the test cases use any special JavaScript features or syntax beyond what's standard in modern JavaScript.

**Other alternatives**

If you wanted to optimize this benchmark further, you could consider using other approaches, such as:

* **Using a dedicated hexadecimal conversion library**: Instead of implementing the conversion logic yourself, you could use an existing library that's optimized for performance.
* **Using SIMD instructions**: If you're targeting a platform that supports SIMD (Single Instruction, Multiple Data) instructions, you could optimize the conversion logic to use these instructions, which can significantly improve performance for certain types of data.
* **Using a Just-In-Time (JIT) compiler**: Some JavaScript engines, like V8 in Chrome, have JIT compilers that can optimize hot functions like this one. You could try running the benchmark through a JIT compiler to see if it improves performance.

Keep in mind that these alternatives might add complexity and overhead to your benchmark, so you should carefully consider the trade-offs before implementing them.

Related benchmarks:

array buffer to hex conversion (version: 0)

convert array buffer to hex

Comparing performance of: directly set vs push values

Created: one year ago by: Guest

Jump to the latest result

directly set

push values

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):