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Parallel execution 2
(version: 0)
Benchmark.js
Comparing performance of:
Promise all vs Array vs Seq
Created:
5 years ago
by:
Guest
Go to the latest result
Script Preparation code:
const asyncBuilder = (t) => async () => setTimeout(() => t, t) const a10s = asyncBuilder(100);
Tests:
Promise all
(async () => await Promise.all([a10s(), a10s()]))()
Array
(async () => [await a10s(), await a10s()])()
Seq
(async () => { await a10s(); await a10s(); })()
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
Fork
Test case name
Result
Promise all
Array
Seq
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:133.0) Gecko/20100101 Firefox/133.0
Browser/OS:
Firefox 133 on Ubuntu
View result in a separate tab
Embed
Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=577465" width="100%" height="500px"></iframe>
Seq
173K/s
Array
98K/s
Promise all
88K/s
View exact numbers
Test name
Executions per second
✓
Seq
173,226 Ops/sec
Array
98,200 Ops/sec
Promise all
87,864 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the provided benchmark and explain what's being tested, compared options, pros and cons, library usage, special JavaScript features, and other considerations. **Benchmark Overview** The provided benchmark measures the execution performance of three different approaches for executing asynchronous tasks: `Promise.all`, `[await a10s(), await a10s()]`, and `{ await a10s(); await a10s(); }`. **Script Preparation Code** The script preparation code defines an async function `asyncBuilder` that takes a time value `t` as input, wraps it in a setTimeout function to introduce a delay, and returns the wrapped function. The `a10s` variable is created by calling this function with `t=100`. This allows for creating multiple asynchronous tasks with varying execution times. **Html Preparation Code** There is no HTML preparation code provided. **Test Cases** The benchmark consists of three test cases: 1. **Promise all**: Executes two asynchronous tasks (`a10s`) using `Promise.all`. 2. **Array**: Executes two asynchronous tasks (`a10s`) and returns them as an array. 3. **Seq**: Executes two asynchronous tasks (`a10s`) sequentially. **Comparison of Approaches** The three approaches differ in how they handle the execution of multiple asynchronous tasks: * **Promise all**: Exects both tasks to complete before proceeding. This approach is suitable for cases where the order of task completion doesn't matter. * **Array**: Returns both tasks immediately, without waiting for them to complete. This approach can lead to resource leaks or other issues if not handled correctly. * **Seq**: Executes tasks sequentially, one after the other. This approach ensures that each task completes before moving on to the next one. **Pros and Cons** Here are some pros and cons of each approach: * **Promise all**: + Pros: Efficient use of resources, handles parallel execution efficiently. + Cons: May not be suitable for cases where order matters or tasks have different completion times. * **Array**: + Pros: Simple to implement, can handle multiple tasks in parallel. + Cons: May lead to resource leaks, incorrect task ordering, or other issues if not handled correctly. * **Seq**: + Pros: Ensures correct task ordering and execution, suitable for cases where order matters. + Cons: May be less efficient than Promise all for certain use cases. **Library Usage** There is no explicit library usage in the provided benchmark. However, `Promise` is a built-in JavaScript object that provides support for promises. **Special JavaScript Features** None are explicitly mentioned in the provided benchmark. **Other Considerations** When running benchmarks like this one, it's essential to consider factors such as: * **Context switching**: The cost of switching between tasks or threads can impact performance. * **Resource allocation**: Efficient resource allocation and management are crucial for achieving optimal performance. * **Browser-specific behavior**: Browser-specific behaviors, such as caching or rendering quirks, can affect benchmark results. **Alternatives** Other alternatives for benchmarking JavaScript microbenchmarks include: * **V8 Benchmark Suite**: A collection of benchmarks designed to test the performance of the V8 JavaScript engine. * **JSPerf**: A benchmarking tool specifically designed for JavaScript performance testing. * **BenchmarkDotNet**: An open-source benchmarking framework for .NET, also compatible with JavaScript.
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