Benchmark: testpow - MeasureThat.net

Tests:

no
function pow1(x, y) { return x**y; } var b = pow1(2, 20)
with
function pow (x, y) { var q = parseInt((y / 2), 10); if (y % 2 !== 0) { return (x ** q) * (x ** q) * x; } return (x ** q) * (x ** q); } var a = pow(2, 20)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
no
with

Fastest: N/A

Slowest: N/A

Latest run results:

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's break down the provided JSON data to understand what is being tested in this JavaScript microbenchmark.

**Benchmark Definition**

The benchmark definition is a simple JavaScript function that calculates the power of a number. There are two versions:

1. `pow1(x, y)`: This version uses the standard exponentiation operator (`x**y`).
2. `pow (x, y)`: This version is a custom implementation that reduces the exponent by half in each iteration and multiplies the result by the square of the base number when the exponent is odd.

**Options Compared**

The two versions of the power function are compared to determine which one performs better in terms of execution speed. The options being compared are:

* Using standard exponentiation (`x**y`)
* Custom implementation with iterative reduction and multiplication (`(x ** q) * (x ** q) * x`)

**Pros and Cons**

1. **Standard Exponentiation (`x**y`)**:
	* Pros: Simple, efficient, and widely supported.
	* Cons: May not be as fast for very large exponents due to the overhead of repeated multiplications.
2. **Custom Implementation (`(x ** q) * (x ** q) * x`)**:
	* Pros: Can potentially outperform standard exponentiation for very large exponents, as it reduces the number of multiplications required.
	* Cons: More complex and may have higher overhead due to repeated calculations.

**Library and Special JS Features**

There is no explicit library used in these benchmark definitions. However, the `pow` function implementation uses a feature called "short-circuit evaluation" (also known as "early returns") to optimize performance by shortening the execution path when the exponent is even.

**Other Considerations**

* The benchmark results are reported in executions per second (`ExecutionsPerSecond`). This metric measures how many times each function can execute in one second.
* The test cases are run on a Chrome 73 browser on a Windows desktop platform. Other browsers, platforms, and versions may yield different results.

**Alternatives**

If you wanted to write your own benchmarking tool or script to compare the performance of these two power functions, you could consider using tools like:

1. Node.js built-in `process` module for timing and measuring execution speed.
2. A lightweight JavaScript testing framework like Jest or Mocha.
3. A custom scripting language or library specifically designed for benchmarking, such as Benchmark.js.

Keep in mind that the specific implementation details may vary depending on your chosen approach and requirements.

Related benchmarks:

testpow (version: 0)

Comparing performance of: no vs with

Created: 7 years ago by: Guest

Jump to the latest result

no

with

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):