Preventing Event Loop Blocking in Node.js: The Key to Streamlining Performance

Question

Preventing Event Loop Blocking in Node.js: The Key to Streamlining Performance

I am currently working on developing two APIs using Express.js. The tasks for both APIs are quite straightforward. The first API involves running a for loop from 1 to 3,000,000, while the second API simply prints a string in the console.

All the necessary source codes have been prepared and configured.

app.get('/firstAPI', (req, res) => {
    for (let i = 1; i <= 3000000; i++) {
        console.log('First API' + i + '\n');
    }
});

app.get('/secondAPI', (req, res) => {
    console.log('Here is the Second API');
});

However, I have encountered an issue. When calling the first API, it takes a significant amount of time to complete its execution. This delay in processing then hinders any calls to the second API, despite its simplicity. It seems like there may be Event Loop Blocking occurring in node.js.

Therefore, my question is: What measures can I take to overcome or avoid this obstruction?

javascript node.js arrays loops express

Answer 1

Answer №1

It is important to provide an example of your current process, as running the CPU at 100% capacity should be avoided at all costs. Additionally, failing to respond to requests in a timely manner can lead to prolonged waiting times on the client side.

Your code already shows that the API functions are non-blocking, unless the CPU usage reaches 100%. For instance:

app.get('/firstAPI', (req, res) => {
    console.log('Received request for First API');
    setTimeout(function(){
        res.end();
        console.log('Responded to request for First API');
    }, 5000);
});

app.get('/secondAPI', (req, res) => {
    console.log('Second API has been accessed');
    res.end();
});

In this scenario, while the first API takes 5 seconds to respond, the second API will continue to function smoothly without any delays.

Answer 2

It is important to provide an example of your current process, as running the CPU at 100% capacity should be avoided at all costs. Additionally, failing to respond to requests in a timely manner can lead to prolonged waiting times on the client side.

Your code already shows that the API functions are non-blocking, unless the CPU usage reaches 100%. For instance:

app.get('/firstAPI', (req, res) => {
    console.log('Received request for First API');
    setTimeout(function(){
        res.end();
        console.log('Responded to request for First API');
    }, 5000);
});

app.get('/secondAPI', (req, res) => {
    console.log('Second API has been accessed');
    res.end();
});

In this scenario, while the first API takes 5 seconds to respond, the second API will continue to function smoothly without any delays.

Preventing Event Loop Blocking in Node.js: The Key to Streamlining Performance

Answer №1

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