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Instantiation of ArrayBuffer vs Normal Part 2
(version: 0)
Comparing performance of:
Uint32 vs Normal vs Uint32Array vs Uint8Array
Created:
3 years ago
by:
Guest
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Script Preparation code:
var last = 100000;
Tests:
Uint32
for (let i; i < last; i++) { const x = new ArrayBuffer(4); const y = new Uint32Array(x); y[0] = 255; }
Normal
for (let i; i < last; i++) { var y = 255; }
Uint32Array
const x = new ArrayBuffer(4 * last); const y = new Uint32Array(x); last = y.length; for (let i; i < last; i++) { y[0] = 255; }
Uint8Array
const x = new ArrayBuffer(last); const y = new Uint8Array(x); last = y.length; for (let i; i < last; i++) { y[0] = 255; }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
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Test case name
Result
Uint32
Normal
Uint32Array
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):
Let's break down the provided JSON and benchmark setup. **Benchmark Definition** The benchmark is comparing different approaches to instantiating an ArrayBuffer in JavaScript, specifically: 1. Instantiating an ArrayBuffer using the `new` keyword with no arguments (`const x = new ArrayBuffer(4);`) 2. Assigning a value to a variable and then instantiating an Uint32Array from that variable (`var y = 255; const x = new ArrayBuffer(y);`) 3. Instantiating a large ArrayBuffer in one step (`const x = new ArrayBuffer(4 * last);`) 4. Instantiating a smaller ArrayBuffer in one step, but with different type (`const x = new ArrayBuffer(last);`) The goal of this benchmark is to measure the performance difference between these approaches. **Options Compared** There are four main options being compared: 1. `Uint32`: Instantiates an ArrayBuffer using the `new` keyword with no arguments and then creates a Uint32Array from it. 2. `Normal`: Assigns a value to a variable and then instantiates an Uint32Array from that variable. 3. `Uint32Array`: Instantiates a large ArrayBuffer in one step and then creates a Uint32Array from it. 4. `Uint8Array`: Instantiates a smaller ArrayBuffer in one step, but with different type. **Pros and Cons of Each Approach** 1. **`Uint32`**: This approach is simple and easy to understand. It creates an ArrayBuffer using the `new` keyword and then creates a Uint32Array from it. However, it may not be optimized for performance. 2. **`Normal`**: This approach can lead to slower performance because it involves assigning a value to a variable before creating an ArrayBuffer. 3. **`Uint32Array`**: This approach instantiates a large ArrayBuffer in one step, which can improve performance. However, it requires more memory and may not be suitable for all use cases. 4. **`Uint8Array`**: This approach is similar to `Uint32`, but uses a smaller ArrayBuffer size. It can improve performance in some cases, but its impact on performance may vary depending on the specific use case. **Library and Purpose** The `Uint32Array` and `Uint8Array` classes are part of the JavaScript standard library, specifically the Typed Array API. These APIs provide an efficient way to work with arrays of numbers (either 32-bit or 8-bit integers) in JavaScript. **Special JS Feature/Syntax** This benchmark does not use any special JavaScript features or syntax that would make it difficult to understand for most software engineers. **Other Alternatives** Other approaches to instantiating an ArrayBuffer might include: 1. Using a library like `Buffer.js` or `TypedArray.js`, which provide additional functionality and optimizations. 2. Using a native WebAssembly module, which can provide even better performance. 3. Using a different data structure, such as an array buffer view (`TypedArrayView`), to access the ArrayBuffer. However, these alternatives are likely to be overkill for a simple benchmark like this one, and may not offer significant performance improvements.
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