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Half loop and double iteration ops
(version: 0)
Comparing performance of:
Loop with N/2 iterations and 2x iteration size vs Simple Loop vs Reverse While vs Reverse While !== 0
Created:
4 years ago
by:
Registered User
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Script Preparation code:
var str = 'd sd a SDAS dad sad asd ad SAd sad fgh gfhgjhg fgdjf h;dsfgs dflgk sdljl dfgjdfg lkdfsjgl sdg jdsflg gjdhdjrebfkjsfgnfsd ngkjdfgn dfsng ndfklgndsfkjlgn kjlsdfng jklndfsgljkndsfklgndsfkjlgnfdkjgn sjkflgndfskjlgn dkjlfgnldskjngfdlkjgndsflgn dfskljg nfdgl kdfnsgljkfsdnglkjsdfnglskjdgnsdlfgnsdfjgnsfdlkhj sfdjhl';
Tests:
Loop with N/2 iterations and 2x iteration size
var end = str.length / 2 | 0; var res1 = ''; var res2 = ''; var resA = ''; for (let i = 0; i < end; i++) { res1 += '#' + str[i]; res2 += '#' + str[i + end]; } resA = res1 + res2 + ((str.length % 2) ? '#' + str[str.length-1] : '' ) + '#';
Simple Loop
var length = str.length; var resB = ''; for (let i = 0; i < length; i++) { resB += '#' + str[i]; } resB += '#';
Reverse While
var i = str.length; var resC = ''; while (i--) { resC = str[i] + '#' + resC; } resC = '#' + resC;
Reverse While !== 0
var i = str.length; var resD = ''; while (i-- !== 0) { resD = str[i] + '#' + resD; } resD = '#' + resD;
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
Previous results
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Test case name
Result
Loop with N/2 iterations and 2x iteration size
Simple Loop
Reverse While
Reverse While !== 0
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 dive into explaining the JavaScript microbenchmark provided by MeasureThat.net. **Benchmark Overview** The benchmark consists of four test cases that measure the performance of different loop constructs in JavaScript: Simple Loop, Reverse While, and two versions of Loop with N/2 iterations. The goal is to determine which loop construct is the most efficient. **Loop Constructs Compared** 1. **Simple Loop**: A traditional `for` loop with a fixed iteration size. * Pros: Easy to understand, widely supported, and well-established in JavaScript. * Cons: May not be optimized for performance, as it involves array indexing and incrementing the loop counter. 2. **Reverse While**: A `while` loop that decrements the loop counter until reaching 0. * Pros: Can avoid array indexing and decrementing the loop counter, which might improve performance. * Cons: May not be supported by all browsers or have the same performance characteristics as traditional loops. 3. **Loop with N/2 iterations**: A `for` loop with an iteration size that is half the length of the input string. * Pros: Reduces the number of iterations, potentially improving performance by reducing overhead. * Cons: May not be supported by all browsers or have the same performance characteristics as traditional loops. **Library Used** None explicitly mentioned in the provided benchmark definitions. However, it's likely that the test framework used by MeasureThat.net is utilizing the built-in JavaScript features to execute these benchmarks. **Special JS Features/Syntax** The benchmark uses a bitwise OR operator (`|`) to perform integer division and round down to the nearest whole number. **Other Considerations** * **Array indexing**: The `for` loop with N/2 iterations involves array indexing, which can be slower than simple string iteration. * **Loop counter management**: Reverse While loops may require more careful management of the loop counter due to the decrementing nature, which could impact performance. * **Browser support**: Different browsers might have varying levels of support for these loop constructs or optimize them differently. **Alternatives** If you're interested in exploring alternative JavaScript execution engines or optimizing your own benchmarks, some options include: 1. V8 (Node.js Engine) 2. SpiderMonkey (Firefox Engine) 3. WebKit (Safari/Chrome Engines) 4. Baseline.js (a simple benchmarking framework for JavaScript) When creating your own benchmarks, consider factors like: * Using a consistent test environment * Controlling loop iteration size and increments * Avoiding unnecessary computations or array indexing * Opting for clear, readable code Keep in mind that benchmarking is an iterative process, and the best approach might vary depending on specific use cases, hardware, and software environments.
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