Quoting Registration <registrat...@portabile.net>:
On 2015-03-30, at 23:21 , Registration <registrat...@portabile.net> wrote:
On 2014-10-29, at 17:45 , Registration <registrat...@portabile.net> wrote:
On 2015-03-29, at 14:10 , Arjen de Korte <arjen+ho...@de-korte.org> wrote:
Citeren Registration <registrat...@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out-of-date.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.
My 12,000 message Trash folder takes around ~2 seconds to load the
initial view.
Understand that this kind of operation (message list) is almost
certainly a bottleneck at the IMAP level, rather than the PHP level.
Your performance is going to be pretty bad on large mailboxes unless
using a caching IMAP server or caching on the Horde side (or both).
michael
___________________________________
Michael Slusarz [slus...@horde.org]
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