Benchmark: setuint8 vs uint8array performance performance compare v2

Script Preparation code:

var size = 10 * 1024 * 1024;

var buf = new ArrayBuffer(size);
var u8 = new Uint8Array(buf);

var buf2 = new ArrayBuffer(size);
var view = new DataView(buf2);

Tests:

setuint8
for (let i = 0; i < size; i++) { u8[i] = 42; }
uint8array
for (let i = 0; i < size; i++) { view.setUint8(i, 43); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
setuint8
uint8array

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

Measuring performance benchmarks like this one can be insightful, but they also come with their own set of considerations.

**What's being tested?**

The benchmark is comparing the performance of two approaches:

1. **Setting individual bytes (`setuint8`)**: This approach uses a `Uint8` array to store values.
2. **Using a `DataView` object with an `ArrayBuffer` (`uint8array`)**: This approach uses a `DataView` object, which is a view into an `ArrayBuffer`, allowing for low-level memory manipulation.

**Options being compared**

The benchmark is comparing the performance of setting individual bytes in two ways:

*   Directly in the `Uint8` array using `u8[i] = 42;`
*   Using the `DataView` object with `view.setUint8(i, 43);`

**Pros and Cons:**

### Setuint8

*   **Pros:**
    *   Simpler code (less memory management overhead)
    *   Easier to understand for developers familiar with C-style arrays
*   **Cons:**
    *   May incur higher overhead due to the `Uint8` object's creation and management
    *   More memory usage, as a new array is created for each iteration

### Uint8array

*   **Pros:**
    *   Reduced memory usage since no new arrays need to be created
    *   Potential performance benefits due to lower overhead from the `DataView` object's use of existing memory
*   **Cons:**
    *   More complex code (requires understanding of `DataView` and `ArrayBuffer`)
    *   May have higher overhead for some JavaScript engines or interpreters

**Library and purpose**

The `DataView` library is a built-in feature in JavaScript, allowing developers to access the binary data within an `ArrayBuffer`. It provides methods like `setUint8()` to set individual bytes.

In this benchmark, using `DataView` with an `ArrayBuffer` (the `uint8array` approach) allows for more efficient memory usage and potentially better performance compared to directly setting values in a `Uint8` array (`setuint8`).

**Special JS feature or syntax**

There is no special JavaScript feature or syntax explicitly mentioned in this benchmark. However, it's worth noting that modern JavaScript engines are optimized for the use cases described here.

**Other alternatives**

While not specifically mentioned in the benchmark, other approaches to compare performance might include:

*   Using `TypedArray` objects (like `Int8Array`) which offer better memory efficiency than `Uint8Array`
*   Employing SIMD (Single Instruction, Multiple Data) instructions for parallelized computations
*   Leveraging specialized libraries or frameworks optimized for specific use cases

Keep in mind that the choice of approach depends on the specific requirements and constraints of your project.

Related benchmarks:

setuint8 vs uint8array performance performance compare v2 (version: 0)

Comparing performance of: setuint8 vs uint8array

Created: 3 years ago by: Guest

Jump to the latest result

setuint8

uint8array

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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