Hi,
What is the average RAM consumed by a regular process ?
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I don’t know much about that kind of scale, but I’d bet your storage will be a bottleneck before even 16GB ram was used up.
Tell us more about the setup?
It’s a VPS with 2Tb of space storage. CPU is Intel® Xeon® CPU E5-2620 v2 @ 2.10GHz, 6 cores
The thing is, I’m reviving an old forum who got crushed because of Facebook. It had 25K users (planning to send them a beautiful Email to get back)
Average visits per day was around 6K unique visits. It used a personal forum script that I wrote from scratch and was using around 24MB / process. I was new to development so it was not well optimized.
There were times when I was pulling my hair because of performance. So it’s still of big worry for me.
Discourse sounds like a perfect replacement for the old fashioned forum I had.
At that scale your server will be ample and over provisioned. A 4GB instance at Digital Ocean would probably be enough.
There are tons of metrics that define load, it is very hard to estimate:
- Number of concurrent sessions
- Total number of posts in forum
- Anon vs Logged in breakdown (anon is WAY cheaper)
- Number of uniquely secured categories
And so on…
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Good news for me ! 
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