Context switches and serialization in Node

“Go scales quite well across multiple cores iff you decompose the problem in a way that’s amenable to Go’s strategy. Same with Erlang. No one is making “excuses”. It’s important to understand these problems. Not understanding concurrency, parallelism, their relationship, and Amdahl’s Law is what has Node.js in such trouble right now…”

“Threads and processes both require a context switch, but on posix systems the thread switch is considerably less expensive. Why? Mainly because the process switch involves changing the VM address space, which means all that hard-earned cache has to be fetched from DRAM again. You also pay a higher cost in synchronization: every message shared between processes requires crossing the kernel boundary. So not only do you have a higher memory use for shared structures and higher CPU costs for serialization, but more cache churn and context switching…”

http://aphyr.com/posts/244-context-switches-and-serialization-in-node

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