Awesome! On a single node with how much memory? It’s not the number of processes that worries me, but the total memory used 
- but well of course this depends on how much data you put into each process, results will vary a lot.
jaimeiniesta
0
brightball
jaimeiniesta
Yes, but then you have to add the memory used for the data held within each process. In the case of the app in that book, it would be the data for each Islands game.
But then let’s say you implement a Blog server where every user, post, comment, is held into memory at once - how much data is this going to need? Can we afford it or should we implement a way to unload selectively processes from memory?
I’ve expressed this in the context of my own app in this other thread, but it would apply to any real-world example. For example, this forum, can we hold all of its topics, comments, users, etc., entirely in RAM?
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lance
Author of Functional Web Development with Elixir, OTP, and Phoenix
It’s an AWS instance with 30 gigs of ram. If ram usage is a concern - and depending entirely on your use case - you might want to investigate the optional hibernate and/or terminate elements for :gen_server return tuples. We currently don’t use either, but if ram usage becomes an issue, we will.
2
kokolegorille
Shrike
Just wanted to say thanks this thread got me to finally buy some Elixir books, so cheers and keep up the good work
2
lance
Author of Functional Web Development with Elixir, OTP, and Phoenix
Thanks! And best of luck. I hope you have a great experience with Elixir and all the books you’ve bought!
0
frankguitarrunner
Im really liking how this book is structured. It gave me a different view on how to approach an elixir/phoenix project. It has been a great read so far!
3
lance
Author of Functional Web Development with Elixir, OTP, and Phoenix
AstonJ
I’d forgotten I bought this already 
had an email saying it’s been updated:
Changes in This Release
Added “Process Supervision For Recovery”
Addressed errata
Does anyone know if Ecto or persistence is going to be covered in the book?
2