[horde] apache cpu usage?

[Michael J Rubinsky]

Quoting avp at rokeyetee.com:

> I'm running Horde on a AWS t2.medium instance - HORDE GROUPWARE WEBMAIL
> EDITION 5.2.6
>
> I've got some funny apache behaviour that just doesn't seem right to me...
>
> When I run "apache2ctl status", 99% of the time all threads are in the "W"
> (Sending Reply) state:
>
>     Current Time: Thursday, 18-Feb-2016 10:02:53 NST
>      Restart Time: Thursday, 18-Feb-2016 09:49:25 NST
>      Parent Server Config. Generation: 1
>      Parent Server MPM Generation: 0
>      Server uptime: 13 minutes 27 seconds
>      Server load: 0.77 0.77 0.85
>      Total accesses: 1382 - Total Traffic: 7.7 MB
>      CPU Usage: u230.64 s11.47 cu0 cs0 - 30% CPU load
>      1.71 requests/sec - 9.8 kB/second - 5.7 kB/request
>      20 requests currently being processed, 8 idle workers
>    
>   _WWWWWW_WWWWW__W_WWWWWW__W.K_...........
>
>
> It seems strange to me that "sending reply" would be the bottleneck?
>
> Also when I run top, I constantly see apache procs jumping to the top with
> up to 50% cpu usage.
>
> Most all the connections are ActiveSync.

When an ActiveSync client is configured for "Push", the connection to  
the webserver remains open while it runs the PING command. These  
requests last up to the "hearbeat interval" that is negotiated between  
the server and client unless there is a change detected, when the PING  
requests ends and a new SYNC request is issued. It makes complete  
sense that you would see ActiveSync connections remaining open.



> What are recommended settings for apache when running Horde?
>
> Any other tips/advice to lower CPU usage?  
> Thanks.
>
>  
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-- 
mike
The Horde Project
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