I am considering switching from forever to PM2 to keep my node application up and running.

I am confused about the following remended methods for starting a process:

$ pm2 start app.js -i 4 # Daemonize pm2 and Start 4 clustered instances of app.js
                        # You can also pass the 'max' params to start

Could someone explain to me what is a clustered instance of app.js? How many instances should I start? 1? Max?

I am considering switching from forever to PM2 to keep my node application up and running.

I am confused about the following remended methods for starting a process:

$ pm2 start app.js -i 4 # Daemonize pm2 and Start 4 clustered instances of app.js
                        # You can also pass the 'max' params to start

Could someone explain to me what is a clustered instance of app.js? How many instances should I start? 1? Max?

• javascript
• node.js
• pm2

Share Improve this question Follow edited Jun 17, 2014 at 8:41 Oleg 9,35922 gold badges4545 silver badges5959 bronze badges asked Sep 19, 2013 at 20:31 user1031947user1031947 6,6741717 gold badges6565 silver badges9191 bronze badges

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Clustered app means duplicating the application to use each cpu instead of only one,

If you do:

$ pm2 start app.js

It will only launch one application

If you do:

$ pm2 start app.js -i max

It will launch the maximum number applications depending on the number of cpus available, so if it's a networked app, requests will be balanced between all processes!