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Measure difference between condition check and total assignation
(version: 0)
Comparing performance of:
Check vs Assignation
Created:
8 years ago
by:
Registered User
Jump to the latest result
Script Preparation code:
var directions = [0, 2, 4, 8]; var current = -1;
Tests:
Check
for (var i = 0; i < 1000; i++) { var rCursor = Math.floor(Math.random() * directions.length); var rIndex = Math.floor(Math.random() * directions.length); if(rCursor == 0 && rIndex != current) { current = rIndex; } else if(rCursor == 1 && rIndex != current) { current = rIndex; } else if(rCursor == 2 && rIndex != current) { current = rIndex; } else if(rCursor == 3 && rIndex != current) { current = rIndex; } }
Assignation
for (var i = 0; i < 1000; i++) { var rCursor = Math.floor(Math.random() * directions.length); var rIndex = Math.floor(Math.random() * directions.length); if(rCursor == 0) { current = rIndex; } else if(rCursor == 1) { current = rIndex; } else if(rCursor == 2) { current = rIndex; } else if(rCursor == 3) { current = rIndex; } }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Check
Assignation
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 preparation code to understand what's being tested. **Benchmark Definition** The benchmark definition is a simple JavaScript script that simulates two different scenarios: 1. **Condition Check**: The script loops 1000 times, generating random indices `rCursor` and `rIndex`. It then checks if `rCursor` equals 0 and `rIndex` does not equal the current value (`current`). If true, it updates `current` with the new value of `rIndex`. 2. **Total Assignment**: The script is similar to the condition check scenario, but without the conditional statement that updates `current`. **Options Compared** The benchmark compares two different approaches: 1. **Condition Check**: This approach involves checking a condition before assigning a value to `current`. In this case, it's unnecessary to assign a new value to `current` on every iteration, as the condition already determines if an update is needed. 2. **Total Assignment**: This approach simply assigns a new value to `current` regardless of whether the condition is met or not. **Pros and Cons** * **Condition Check (Check)**: + Pros: Avoids unnecessary assignments and potential performance gains due to reduced branching overhead. + Cons: Requires an additional conditional statement, which might introduce slight performance penalties. * **Total Assignment (Assignation)**: + Pros: Simplifies the code and reduces branching overhead. No need for an additional conditional statement. + Cons: Assigns a new value to `current` unnecessarily, potentially leading to performance issues due to the increased number of assignments. **Library/Functionality** There is no explicit library or functionality mentioned in the benchmark definition. However, it's worth noting that using `Math.random()` to generate random numbers might not be the most efficient approach for generating random indices, especially if you need a large number of iterations. **Special JS Features/Syntax** There are no special JavaScript features or syntax used in this benchmark. It uses standard JavaScript syntax and does not rely on any advanced features like `let` or `const`, which were introduced in ECMAScript 2015 (ES6). **Other Alternatives** If you're interested in exploring alternative approaches, here are a few options: 1. **Loop Unrolling**: This technique involves increasing the loop iteration count while reducing the number of statements inside the loop. This can lead to better performance due to reduced branching overhead. 2. **SSE (Single Instruction, Multiple Data)**: This CPU instruction set is designed for parallel processing and can be used to optimize loops with large datasets. However, keep in mind that the effectiveness of these alternatives depends on the specific use case and hardware architecture. MeasureThat.net is primarily focused on measuring the performance difference between various JavaScript optimizations, so it's unlikely that you'll find significant benefits from using alternative techniques in this specific benchmark.
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