Benchmark: onIdle 1000 - MeasureThat.net

Script Preparation code:

    function onceIdle1(func = Boolean, group = func) {
        window.cancelIdleCallback(group.idleCallback);
        group.idleCallback = window.requestIdleCallback(func);
    }

    function onceIdle2(func = Boolean, group = func) {
        if (!group.idleCallback) {
            group.idleCallback = window.requestIdleCallback(() => {
                group.idleCallback = false;
                func();
            });
        }
    }

    function noop() {
        console.log(new Date().toISOString());
    }

Tests:

CancelCallback
for(i = 0; i < 1000; i++) {onceIdle1(noop);}
IfNotCallback
for(j = 0; j < 1000; j++) {onceIdle2(noop);}

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
CancelCallback
IfNotCallback

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.82 Safari/537.36 Edg/93.0.961.52

Browser/OS: Chrome 93 on Windows

View result in a separate tab

Test name	Executions per second
CancelCallback	293.6 Ops/sec
IfNotCallback	1170.8 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and its components.

**Benchmark Goal**

The primary goal of this benchmark is to compare the performance of two approaches for canceling idle callbacks in JavaScript:

1. `onceIdle1`: Cancels the previous idle callback and then schedules a new one using `requestIdleCallback`.
2. `onceIdle2`: Checks if an idle callback exists, and if not, creates a new one and sets it to false before scheduling a new one.

**Library Usage**

In this benchmark, the following JavaScript libraries or APIs are used:

1. `window.requestIdleCallback`: A Web API for executing tasks at the next idle moment. It's part of the W3C's Idle API.
2. `console.log`: A built-in function for logging messages to the console.

**Special JS Feature/Syntax**

The benchmark uses JavaScript syntax that's specific to certain browsers, particularly Chrome and Edge:

1. `onceIdle1` and `onceIdle2` functions are defined using ES6 syntax (arrow functions and destructuring).
2. The `noop` function is a simple function that logs the current date and time using `console.log`.

**Benchmark Approaches**

The two benchmark approaches differ in how they handle the existence of an idle callback:

1. **CancelCallback (`onceIdle1`)**: Cancels the previous idle callback using `window.cancelIdleCallback`. If there's no previous callback, it schedules a new one using `requestIdleCallback`.
2. **IfNotCallback (`onceIdle2`)**: Checks if an idle callback exists. If not, it creates a new one and sets it to false before scheduling a new one.

**Pros and Cons**

Here are some pros and cons of each approach:

1. **CancelCallback (onceIdle1)**
	* Pros:
		+ Efficient in terms of memory usage.
		+ Simple to implement.
	* Cons:
		+ May lead to unnecessary cancellations if the idle callback is called repeatedly with different functions.
2. **IfNotCallback (onceIdle2)**
	* Pros:
		+ More efficient in terms of CPU cycles, as it avoids unnecessary cancellations.
	* Cons:
		+ Requires more memory to store the idle callback and its state.
		+ More complex implementation.

**Other Considerations**

When writing benchmark code, consider the following factors:

1. **Memory usage**: Measure how much memory is allocated for each approach.
2. **CPU cycles**: Measure how many CPU cycles are spent on each approach.
3. **Browser support**: Ensure that both approaches work correctly across different browsers and versions.

**Alternatives**

If you're looking for alternatives to these approaches, consider the following:

1. Use `window.clearTimeout` instead of `requestIdleCallback` if you need more control over the execution time.
2. Implement a custom idle callback system using a timer or scheduling library like `node-timer`.
3. Consider using a different approach that uses async/await or promises to handle idle callbacks.

Keep in mind that this benchmark is focused on comparing two specific approaches, and its results may not be representative of other scenarios. When writing your own benchmarks, consider the goals, requirements, and constraints of your project, as well as potential alternatives and trade-offs.

Related benchmarks:

onIdle 1000 (version: 0)

Testing if window.cancelIdleCallback is fast or slow

Comparing performance of: CancelCallback vs IfNotCallback

Created: 3 years ago by: Guest

Jump to the latest result

CancelCallback

IfNotCallback

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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