Benchmark: Generator apply vs sync apply

Script Preparation code:

const data = ["hello", " ", "world"];
const dep0 = 0;
const dep1 = 1;
const dep2 = 2;
var syncDeps = [dep0, dep1, dep2];

function* genFn() {
    return (yield dep0) + (yield dep1) + (yield dep2);
}

function syncFn(a, b, c) {
    return a + b + c;
}

function runGen(fn) {
    let gen = fn();
    let next = gen.next();

    while (!next.done) {
        next = gen.next(read(next.value));
    }

    return next.value;
}

function runSync(fn, deps) {
    switch (deps.length) {
        case 1:
            return fn(read(deps[0]));
        case 2:
            return fn(read(deps[0]), read(deps[1]));
        case 3:
            return fn(read(deps[0]), read(deps[1]), read(deps[2]));
        case 4:
            return fn(read(deps[0]), read(deps[1]), read(deps[2]), read(deps[3]));
        case 5:
            return fn(
                read(deps[0]),
                read(deps[1]),
                read(deps[2]),
                read(deps[3]),
                read(deps[4])
            );
        default:
            return fn(...deps.map(read));
    }
}

function read(id) {
    return data[id];
}

Tests:

Generator
runGen(genFn);
Sync
runSync(syncFn, syncDeps);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Generator
Sync

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36

Browser/OS: Chrome 107 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Generator	2294252.2 Ops/sec
Sync	2589356.5 Ops/sec

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

LLMs can make mistakes. Check important info.

**Overview of the Benchmark**

The provided JSON represents a JavaScript benchmark that compares two approaches for applying dependencies to functions: synchronous and asynchronous (generator) methods.

**Synchronous Approach (Sync)**

In this approach, the `runSync` function is used, which takes a function (`syncFn`) and an array of dependencies (`syncDeps`). The function applies each dependency in sequence using the `read` function, which returns the value from the `data` array based on the index provided. If the number of dependencies exceeds 3, it applies all dependencies at once.

**Asynchronous Approach (Generator)**

In this approach, the `runGen` function is used, which takes a generator function (`genFn`) and initializes its execution using the `next` method. The generator yields values based on the dependencies, and the `read` function is used to retrieve these values from the `data` array.

**Pros and Cons of Each Approach**

* **Synchronous (Sync) Approach:**
	+ Pros:
		- Simple and straightforward
		- Can take advantage of parallel processing or concurrent execution
	+ Cons:
		- Limited flexibility in handling dependencies with different lengths
		- May incur additional overhead for handling errors or edge cases
* **Asynchronous (Generator) Approach:**
	+ Pros:
		- More flexible in handling dependencies with varying lengths
		- Can utilize asynchronous programming paradigms, such as async/await
	+ Cons:
		- Requires manual management of generator execution and yield values
		- May incur additional overhead due to the need for cooperative scheduling

**Library and Special JS Features**

* The `read` function is a simple utility that retrieves values from the `data` array based on the provided index.
* There are no explicit references to any special JavaScript features, such as ES6 classes, modules, or async/await syntax.

**Other Alternatives**

For benchmarking JavaScript performance, other alternatives include:

1. **V8 Benchmarks**: Google's V8 engine provides a set of benchmarks for measuring the performance of JavaScript execution.
2. **MicroBench**: A lightweight microbenchmarking framework that allows you to write and run small benchmark tests.
3. **Benchmark.js**: A widely used benchmarking library for Node.js, which supports various test cases and features.

**Considerations**

When choosing a benchmarking approach or library, consider the following factors:

* **Test Case Complexity**: Choose an approach that matches the complexity of your test cases. For simple cases, synchronous approaches might be sufficient. For more complex scenarios, asynchronous approaches like generator functions may be necessary.
* **Performance Requirements**: Consider the level of performance you need to achieve. If high throughput and low latency are critical, you may want to focus on optimizing the synchronous approach. For applications with variable dependency lengths or asynchronous execution requirements, the generator approach might be a better fit.
* **Development Time and Effort**: Choose an approach that balances development time and effort with the level of performance required for your application.

I hope this explanation helps!

Related benchmarks:

Generator apply vs sync apply (version: 0)

Comparing performance of: Generator vs Sync

Created: 4 years ago by: Registered User

Jump to the latest result

Generator

Sync

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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