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Caching Uint8Array length property vs getting it each time in the loop
(version: 0)
save length of the u8arr in the variable vs get it the loop
Comparing performance of:
Cache length vs Do not cache
Created:
4 years ago
by:
Guest
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Script Preparation code:
var arr = new Uint8Array(1000); arr.fill(0xff)
Tests:
Cache length
var arrLen = arr.length; var sum = 0; for (var i = 0; i < arrLen; i++){ sum = arr[i]; }
Do not cache
var sum = 0; for (var i = 0; i < arr.length; i++){ sum = arr[i]; }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Cache length
Do not cache
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Overview of the Benchmark** The provided benchmark, "Caching Uint8Array length property vs getting it each time in the loop", aims to measure the performance difference between two approaches when iterating over a `Uint8Array` object. **Benchmark Definition JSON Explanation** The benchmark definition is represented by the following JSON: ```json { "Name": "Caching Uint8Array length property vs getting it each time in the loop", "Description": "...", "Script Preparation Code": "var arr = new Uint8Array(1000);\r\narr.fill(0xff)", "Html Preparation Code": null } ``` Here's what each part represents: * `Name` and `Description`: The name of the benchmark and a brief description. * `Script Preparation Code`: A JavaScript code snippet that prepares the test environment. In this case, it creates a new `Uint8Array` object with 1000 elements filled with the value 0xff. * `Html Preparation Code`: An empty string, indicating that no HTML-related preparation is required. **Individual Test Cases** The benchmark consists of two individual test cases: 1. **Cache length**: This test case caches the length of the `Uint8Array` object in a variable (`var arrLen = arr.length;`) and then uses this cached value to iterate over the array. 2. **Do not cache**: This test case does not cache the length of the `Uint8Array` object and instead retrieves it within the loop (`arr.length`). **Comparison of Options** The two test cases differ in how they access the length of the `Uint8Array` object: 1. **Caching the length**: By caching the length, the test case avoids repeated lookups within the loop. This approach can reduce memory access and improve performance. 2. **Not caching the length**: In this approach, the length is retrieved every iteration, which may lead to slower performance due to increased memory access. **Pros and Cons** * **Caching the length**: + Pros: Reduced memory access, potentially improved performance. + Cons: Additional memory allocation for the cached value. * **Not caching the length**: + Pros: No additional memory allocation required. + Cons: Increased memory access within the loop, potential performance degradation. **Other Considerations** * The use of `Uint8Array` and its properties is specific to JavaScript's typed arrays. Other programming languages or libraries may use different data structures or approaches. * The benchmark's focus on caching vs not caching the length might be influenced by the underlying hardware and browser optimizations. **Libraries and Special JS Features** There are no libraries explicitly mentioned in the provided benchmark definition or test cases. However, JavaScript's typed arrays (`Uint8Array`, `Int8Array`, etc.) provide a convenient way to work with fixed-size binary data structures. No special JavaScript features are used in these test cases.
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