running multiple node.js applications effectively

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I am a node newbie. I have 3 node applications (each serves different protocols, one of them is web) that should run in an embedded device with limited memory, say 256M. I assume starting 3 node instances would start 3 isolated V8. Should I use the npm pakages "concurrently" or "npm-run-all" to start the 3 apps concurrently? As I understood this approach will start a single V8, is it right? And how is the performance (response time of the 3 apps) comparing with running 3 apps seperately? It would take some tests... but first I would like to learn it from the analytical aspect.

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