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This gist demonstrates a CPU-intensive operation using a Node.js Express server with two endpoints: '/non-blocking-operation' and '/complex-blocking-operation'. If we attempt to run the second one then the first one in parallel, the first operation will be blocked until the second one completes. This illustrates that Node.js CPU-intensive operat…
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const express = require("express"); | |
const app = express(); | |
// Function to check if a number is prime. | |
function isPrime(num) { | |
if (num <= 1) return false; | |
if (num <= 3) return true; | |
if (num % 2 === 0 || num % 3 === 0) return false; | |
for (let i = 5; i * i <= num; i += 6) { | |
if (num % i === 0 || num % (i + 2) === 0) return false; | |
} | |
return true; | |
} | |
app.get("/non-blocking-operation", (req, res) => { | |
res.send( | |
`<html><body><h1>Timetamp: ${Date.now()}</h1><h2>This request is blocked if /complex-blocking-operation is running!!!</h2></body></html>`, | |
); | |
}); | |
app.get("/complex-blocking-operation", (req, res) => { | |
const startTime = Date.now(); | |
// Simulate a compute-intensive operation by finding prime numbers in a large range. | |
const maxLimit = 50000000; | |
const primes = []; | |
for (let i = 2; i < maxLimit; i++) { | |
if (isPrime(i)) { | |
primes.push(i); | |
} | |
} | |
res.send( | |
`<html><body><h1>Timestamp: ${Date.now()}</h1><h2>Max Limit: ${maxLimit}(Million) => Total primes: ${ | |
primes.length | |
} <br />Total Execution Time: ${ | |
(Date.now() - startTime) / 1000 | |
} seconds.</h2></body></html>`, | |
); | |
}); | |
const PORT = process.env.PORT || 3000; | |
app.listen(PORT, () => { | |
console.log(`Server is listening on port ${PORT}`); | |
}); |
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