Install PM2 by running the following command in your terminal: npm install -g pm2 It assists in scaling web applications over multiple local processes, improves the performance of your application, and also helps with monitoring. PM2 is a process manager for production Node.js applications. In here you perform CPU-intensive tasks This code is executed in the worker and not in the main thread. Afterwards, we will perform CPU-intensive tasks in the else block and pass a message back to the main thread with parentPort.postMessage('Hello world!'): const ) In the code snippet below, we are creating an instance of the Worker constructor when we are on the main application thread. Node.js handles async input/output more efficiently than you can with workers, as described in the Node.js documentation. However, do not use them for input/output intensive operations. Workers, or worker threads, are useful for performing CPU-intensive JavaScript operations. Var fork = require('child_process').fork If (counter > cpuCount) throw new Error('Can\'t spawn any more child processes')
Therefore, it’s important not to spawn more child processes than you have cores in your machine.īelow is an example of a Node.js script spawning child processes using the cpuCount variable, which determines whether or not it needs to spawn more child processes: var counter = 0 A child process comes with overhead on your CPU like memory consumption, which uses your machine’s limited resources. Though helpful when used sparingly, an overabundance of child processes will drastically reduce the performance of your code.
Child processesĭespite being single threaded, Node.js can spawn child processes to take care of tasks. Node.js best practicesįirst, let’s start with some best practices to incorporate into your code when it comes to CPU resources. In this article, we’ll look at some best practices for writing and testing your Node.js code, then put them to use with some examples. But how do we ensure that we don’t write unoptimized JavaScript code in Node.js? Also, how do you test the performance of your application both during development and after it’s deployed to production? One of the biggest benefits for teams using Node.js is the ability to use JavaScript on both the client and the server. Node.js best practices and performance analytics in 2021 He is also a technical writer and works as a Node.js consultant, helping clients build and maintain their Node.js applications. Load the debugger UI: Open or the produced URL in the Chrome browser.įor more details we can refer to the official documentation.Kelvin Omereshone Follow Kelvin is an independent software maker currently building Sailscasts, a platform to learn server-side JavaScript.Send it the USR1 signal $ kill -s USR1 2345 $ pgrep -l node 2345 node your/node/server.js Get the PID of the node process using your favorite method.Or one can enable debugging on a node that is already running by sending it a signal: Or, to pause your script on the first line: $ node -debug-brk your/short/node/script.js Enable debug mode in the node process: You can either start Node with a debug flag like: $ node -debug your/node/program.js.The server can be left running in the background, it is possible to debug multiple processes using the same server instance. Start the node-inspector server: This can be done by running command: $ node-inspector.Then we need to follow three steps given below Note: Node Inspector works in Chrome and Opera only.Īdvanced Use: While running node-debug is an easy way to start your debugging session, sometimes we need to tweak the default setup. The node-debug command will load Node Inspector in the default browser. How to resolve 'node' is not recognized as an internal or external command error after installing Node.js ?.How to read and write Excel file in Node.js ?.How to read and write JSON file using Node.js ?.Difference between promise and async await in Node.js.What are the differences between npm and npx ?.Mongoose | findByIdAndUpdate() Function.Difference between node.js require and ES6 import and export.How to install the previous version of node.js and npm ?.Difference between Fetch and Axios.js for making http requests.How to update Node.js and NPM to next version ?.ISRO CS Syllabus for Scientist/Engineer Exam.
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