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Compare long way
(version: 0)
Testing some alternative if comparing
Comparing performance of:
Compare if, x predefined as 0 vs Compare if else vs Compare math abs vs Compare math abs 0p5 vs Compare math one abs
Created:
9 years ago
by:
Guest
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Tests:
Compare if, x predefined as 0
var a = Math.random()*100; var b = Math.random()*100; var x = 0; if ( b > a ) { var x = 1; }; var y = 0.7 * x;
Compare if else
var a = Math.random()*100; var b = Math.random()*100; if ( b > a ) { var x = 1; } else { var x = 0; }; var y = 0.7 * x;
Compare math abs
var a = Math.random()*100; var b = Math.random()*100; var x = (Math.abs(a-b)-Math.abs(a-b+1)+1)/2; var y = 0.7 * x;
Compare math abs 0p5
var a = Math.random()*100; var b = Math.random()*100; var x = (Math.abs(a-b)-Math.abs(a-b+1)+1)*0.5; var y = 0.7 * x;
Compare math one abs
var a = Math.random()*100; var b = Math.random()*100; var x = ((b-a-1)/Math.abs(b-a-1)+1)/2; var y = 0.7 * x;
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (5)
Previous results
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Test case name
Result
Compare if, x predefined as 0
Compare if else
Compare math abs
Compare math abs 0p5
Compare math one abs
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 benchmark definitions and explain what's being tested. **Benchmark Overview** The benchmark is designed to compare different ways of calculating `x` in two `if-else` conditions, as well as with the use of `Math.abs()` function. The goal is to determine which approach yields the best performance. **Test Cases** There are four test cases: 1. **Compare if, x predefined as 0**: This test case uses a simple `if` statement to assign `x = 1` or `x = 0` based on a condition. The value of `x` is then used to calculate `y`. 2. **Compare if else**: Similar to the previous test case, but with an `else` clause. 3. **Compare math abs**: This test case uses the `Math.abs()` function to calculate `x`. There are two variations: * `Compare math abs 0p5`: Multiplies the result of `Math.abs()` by 0.5. * `Compare math one abs`: Divides the result of `Math.abs()` minus 1 by its absolute value, then adds 1 and divides again by 2. 4. **Compare math one abs**: Another variation of the previous test case. **Library Usage** None of the benchmark definitions explicitly use any libraries beyond JavaScript's built-in `Math` object. **Special JS Features or Syntax** There are no special JavaScript features or syntax used in these benchmark definitions, such as async/await, promises, or modern ES6+ features like arrow functions, template literals, or destructuring. **Performance Considerations** When evaluating performance, the following factors come into play: * **Branch prediction**: Modern CPUs often use branch prediction to guess which branch will be taken. If the actual branch is different from the predicted one, it can lead to a slight penalty. In these benchmark definitions, both `if` and `else` branches are used, so we need to consider how well each test case performs with respect to branch prediction. * **Arithmetic complexity**: Calculating `x` involves simple arithmetic operations like multiplication, division, and addition/subtraction. The order of operations can affect performance due to various factors like CPU pipeline optimization, register allocation, and cache misses. * **Cache locality**: Modern CPUs have a large cache hierarchy to optimize performance. The test cases with simpler calculations (e.g., `Compare math abs`) are likely to be more cache-friendly than those with more complex calculations (e.g., `Compare if`). **Other Alternatives** If you want to explore alternative approaches or modify the benchmark, consider the following options: * **Use different mathematical operations**: Try using other mathematical functions like exponentiation, logarithms, or trigonometric functions. * **Add more test cases**: Increase the number of test cases with varying complexities and branching scenarios. * **Modify the condition**: Change the conditions used in each test case to simulate real-world usage patterns. * **Use a different programming language**: If you're interested in exploring performance differences between JavaScript and another language, feel free to create new benchmark definitions using that language. Keep in mind that this is just a starting point for your exploration. You can always modify or extend the existing benchmark definitions to suit your specific needs or interests!
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