Re: [Courier-imap] Very slow with 5 users

[vgrig_us <vgr...@ho...>]

On 08/18/2015 06:10 PM, Sam Varshavchik wrote:
> Grant writes:
>
>> I'm using courier-imap with roundcube.  Browsing email is fast with
>> just 1 or 2 users but becomes extremely slow with 5 users.  How should
>> I look into improving performance for multiple users?
>
> By determining exactly where the performance problem is. There could be
> several reasons: insufficient bandwidth, insufficient memory,
> insufficient CPU; or a few other things. "Improving performance" is not
> just some button that one only need to push, and make it happen.
>
> Use standard system administration tools, like top, iostat, netstat, and
> others, to analyze and profile your server. Once you are confident that
> you know exactly where the bottleneck is, only then you can plan what
> needs to be done.
>

Sorry for replying to wrong message in the thread - missed the original one.

 From what i remember running courier-imap / maildir / webmail, 2 things 
are usually improve performance if slowing down starts with single-digit 
users:
1. imap-proxy
2. filesystem of NFS server that can do fast listing of directories 
containing thousands of files (we used NetApp filers).

Just my experience though - a lot changed since i'm sure.

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