[imp] Imp Performance Problem

[Registration]

> On 2015-03-30, at 23:21 , Registration <registration at portabile.net> wrote:
> 
> 
>> On 2014-10-29, at 17:45 , Registration <registration at portabile.net> wrote:
>> 
>> 
>>> On 2015-03-29, at 14:10 , Arjen de Korte <arjen+horde at de-korte.org> wrote:
>>> 
>>> Citeren Registration <registration at portabile.net>:
>>> 
>>>> Dear Imp users and developers,
>>>> 
>>>> my problem is as follows:
>>>> - Login to Horde takes 3 seconds.
>>>> - Loading mails takes 7 seconds for a larger IMAP folder, and 1-2 seconds for one with only a few messages in it.
>>>> - Top shows 97% CPU from php5-fpm, 3% from imap.
>>> 
>>> That means that performance problems are probably in php. Do you use an php opcode cache / accelerator? If so, which one?
>> 
>> XCache 2.0.0
>> 
>>> 
>>>> - When messages are cached, everything gets super fast.
>>>> - The loading times are probably proportional to the amount of message headers Imp loads for viewing.
>>>> 
>>>> My questions are:
>>>> - Is this normal speed?
>>> 
>>> It depends. How large is a large IMAP folder? How many folders do you have?
>> 
>> I think that Imp caches something a few dozen messages around the currently displayed ones.
>> So the IMAP folder size is not important, just that there are more than a few:
>> For example, an inbox with 10 messages is loaded in a second, a view of a folder with 900 messages
>> takes 6-8 seconds, and also 6-8 seconds for a folder with 20000 messages.
>> 
>>> 
>>>> - If not, how would I systematically search for the problem?
>>>> - I tried xhprof, but I can't get the part where Imp refreshes messages captured.
>>>> 
>>>> My config:
>>>> - Debian Wheezy, Apache, php5-fpm, Dovecot, imapproxy
>>> 
>>> Without version numbers, there is no way for us to tell what you're actually using.
>> 
>> Kernel 3.2.0-4-amd64, Apache 2.2.22, PHP 5.4.39-0+deb7u1, Zend 2.4.0, XCache 2.0.0, Dovecot 2.1.7
>> 
>>> 
>>>> - Auth using Imp using MySQL/PDO connection via sockets
>>>> - Dovecot using Maildir, PAM disabled, mysql auth only
>>>> - Horde caching enabled
>>> 
>>> Which cache backend?
>>> 
>>>> - everything on one host
>>> 
>>> If everything is on the same host, imapproxy is redundant an may even hurt performance if you have a modern IMAP server like Dovecot.
>> 
>> Ok, disconnected and purged it, no visible difference.
>> 
>>> 
>>>> - standard rented server
>>> 
>>> I wonder what the specifications of a 'standard rented server' are. :-)
>> 
>> AMD Opteron 6272, 2 GB RAM, 100 GB SSD - not high end, but not stone-age either, I think
>> 
>>> 
>>>> - everything up-to-date
>>> 
>>> What may be up-to-date on Debian Wheezy may still be seriously out-of-date.
>> 
>> I know, but no testing builds for me anymore...
> 
> I did a performance test using http://www.php-benchmark-script.com/bench.php, which resulted in ~7 seconds for my server, same time as the test on the benchmarks webpage.
> 
> The only thing I could find which could be related to this is the Horde-specific message:
> FastCGI: server "/usr/lib/cgi-bin/php5-fcgi" stderr: PHP message: Cannot write Autoloader cache to backend.
> I tried setting proper path permissions, but no success, the error doesn't go away.
> 

I managed to get the folder view loading time down to four seconds for a larger IMAP folder  (>1k files) like "sent" or "archive".
Could anyone tell me how long it takes to display a folder on their server? I don't have access to a second horde installation.