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copyWithin: is it fast in Uint32Array
(version: 0)
Comparing the performance between iteration and copyWithin in Uint32Array
Comparing performance of:
UInt32Array Iteration copy vs UInt32Array copyWithin
Created:
4 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var buffer = new Uint32Array(1024*1024); for(var i=0; i< buffer.length; i++) { buffer[i] = Math.round(Math.random() * 256); }
Tests:
UInt32Array Iteration copy
var start = 100; var length = 200; var copyToPos = 1000; for(var i=0; i< length; i++) { buffer[copyToPos++] = buffer[start + i] }
UInt32Array copyWithin
var start = 100; var length = 200; var copyToPos = 1000; buffer.copyWithin(copyToPos, start, start + length);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
UInt32Array Iteration copy
UInt32Array copyWithin
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36
Browser/OS:
Chrome 134 on Windows
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=594592" width="100%" height="500px"></iframe>
UInt32Array copyWithin
29.9M/s
UInt32Array Iteration copy
2.0M/s
View exact numbers
Test name
Executions per second
✓
UInt32Array copyWithin
29,905,994 Ops/sec
UInt32Array Iteration copy
1,992,968 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Benchmark Overview** The provided JSON represents a JavaScript benchmark test case on MeasureThat.net, specifically comparing the performance of two approaches for copying data within a Uint32Array: iteration and `copyWithin` methods. **What is being tested?** In the first part of the JSON, a script preparation code generates a large Uint32Array buffer containing random values. This buffer serves as the source array for the benchmark. The second part of the JSON defines two individual test cases: 1. **UInt32Array Iteration copy**: This test case uses a traditional loop to iterate through the source array and copy each element to a new position in the destination array. 2. **UInt32Array copyWithin**: This test case uses the `copyWithin` method, which is part of the Uint32Array prototype, to perform the same copying operation. **Options being compared** The two approaches are compared on their performance: * **Iteration**: A traditional loop-based approach that iterates through the source array and manually updates the destination array. * **copyWithin**: The built-in `copyWithin` method provided by the Uint32Array prototype, which is optimized for performance and efficiency. **Pros and Cons** Here's a brief summary of the pros and cons of each approach: ### Iteration Pros: * Easy to understand and implement * No dependencies on external libraries or methods * Can be used in a variety of contexts where `copyWithin` might not be supported Cons: * May be slower than `copyWithin` due to the overhead of manual loop iteration and array updates. * More prone to errors, as the programmer must ensure that the loops are properly synchronized. ### copyWithin Pros: * Optimized for performance and efficiency by the browser's JavaScript engine * Reduces the risk of errors, as the method is implemented in the browser's native code and is less prone to human error. * Can be used on a wide range of browsers and devices that support Uint32Array. Cons: * May not be supported by older browsers or devices that don't have native support for `copyWithin`. * Requires knowledge of the Uint32Array prototype and its methods. **Library and purpose** In this benchmark, no external libraries are used. The `copyWithin` method is part of the Uint32Array prototype, which is a built-in JavaScript object that provides an efficient way to manipulate arrays in memory. **Special JS features or syntax** There are no special JS features or syntax mentioned in this benchmark. The focus is on comparing two existing methods for copying data within a Uint32Array. **Other alternatives** If `copyWithin` is not supported by the browser, other approaches can be used: 1. **Manual loop iteration**: As described above. 2. **Using other array methods**, such as `splice()` or `slice()`, to achieve the desired copy operation. 3. **Using a third-party library** that provides optimized and consistent copying functionality across different browsers and devices. In summary, this benchmark compares the performance of two approaches for copying data within a Uint32Array: iteration and `copyWithin`. The choice between these approaches depends on the specific requirements of the use case, such as performance, compatibility, and maintainability.
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