Max Entry Processes

[Serra]

I've been with Cloud Linux for a while and I've run into a question about EP. I limit users to either 20 or 30 EP depending on their plans. This is working out fine for me.

However, I began to wonder how many EP my servers can actually create at any given time. Unfortunately, when I search for EP, I get 1000 articles for end users on EP.

What is the formula or how to I determine what a server can produce in relation to EP? I seem to remember something about memory and CPUs, but I can't find it again.

 

[cPanelMichael]

Hello,

Here's a thread on the CloudLinux forums with some discussion on entry processes:

CloudLinux LVE Limits Question

Thank you.

 

[Serra]

Thanks for the reply. Basically, that is great information, but doesn't really answer the question I asked. What I really want to understand is what is the maximum number of EP that a server has. Obviously, if I give 800 accounts the ability to use 100 EP each, then I expect that at some point, I would need X number of EP to support that. Assuming 20%, just for silliness, that is 16k EP. Am I over selling? Do I have 16K EP? Is there a way to find that out without one day finding out I don't?

 

[cPanelMichael]

Hello,

As I understand, the "Entry Processes" are designed to limit "Concurrent Connections" to Apache per the document at:

CloudLinux Documentation

The comments on the following third-party URL goes into some detail on how concurrent connections work:

Apache 2.4 max concurrent users limit

Thank you.

 

[Serra]

That was the formula I was looking for. I was missing that it was based on Max Workers! So, the Apache default is 256 workers. That basically means that the max EP a default server could serve is 256 EP, provided it has the memory to do so.

Interesting, lets look at that first post:

Linux Business / Reseller Ultimate
Entry Processes (Concurrent) = 60
Virtual Memory = 1024MB
Physical Memory = 1024MB
CPU = 200% of 2 cores
Total Connections = 100

So, this random guy in the internet says he is used these as his limits. These limits look amazing. Expect that he is giving, in theory, the user 25% of the server's resources with a 60 EP limit, except he isn't. He has limited the memory usage to 1024MB, that means that each process is really limited to 17mb.

I guess, I should comment on 100 total connection, in case someone is reading this. If his server is a mail server, and he has an office with 10 people reading mail... they will have major issues with a connection limit of 100. I have 6 emails I check right now and I'm using 17 connections on my account.

Anyway, thanks for the information.