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I’m beginning to work on a game server written in Java. Granted, Java is not the best solution to server development, but it is the language that I am most comfortable with.
I’m trying to design this game server to handle a lot of connections, and I’m not sure what to focus more on: storing data in memory or keeping memory usage down and using more raw CPU power?
Certainly depends on what your game is like. I recently benchmarked my server with 5,000 clients at like 20MB of ram. You may keep much more state data than me, and it could be a concern.
Your serious issue with many connections is setting up the sockets to handle it properly, using certain manner of socket handling becomes very bogged down or breaks @1024 connections etc. I’m not sure how much optimization you can do in java.
Look at this link for what I’m talking about.
And, good luck! And also, switch languages as soon as possible to a language offering comparable features to java but without the awful drawbacks (meaning Objective-C or C#). I’m not just “slamming java” but the problem you’re going to reach when you talk about doing things that are performant is that java will abstract you too far from the Operating System and you will not be able to take advantage of optimizations when you need it.