[horde] Apache Performance tuning with Horde

[Patrick De Zordo]

> -----Ursprüngliche Nachricht-----
> Von: horde [mailto:horde-bounces at lists.horde.org] Im Auftrag von
> lst_hoe02 at kwsoft.de
> Gesendet: Donnerstag, 4. Dezember 2014 13:02
> An: horde at lists.horde.org
> Betreff: Re: [horde] Apache Performance tuning with Horde
> 
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> 
> Zitat von Patrick De Zordo <patrick at spamreducer.eu>:
> 
> > First:
> > Our test server is located in a shared datacenter and we are using a
shared
> > SAN storage as our backend.
> > We have checked the bandwidth of the storage using some simple tools
> like dd
> > and htparm..
> > The storage has a LOT of bandwidth and a lot of IOPS.. so there should
be
> no
> > problem.
> 
> Is this some consumer grade VPS or do you have a SLA?
> 
> Shared storage can be slow at unexpected times as it is shared, so it
> depends what others are doing
> 
> Shared storage is sometimes really fast for data in the cache but
> dreaded slow for not often used data
> 

Yes, you are right, BUT, this is a VPS, but it's a business grade system!
I have no kernel wait states for writing or reading data from the storage.

> > Second:
> > During the apache CPU load spikes we are monitoring our system with
> dstat
> > and iotop and we can't see any big disk reads or writes.
> > We just see our CPU going up to 100% for about 4-6 seconds after every
> > little ActiveSync synchronization a client is making.
> 
> Do you have a dedicated vCPU or some shared container? (We have one
> cheap VPS with a vCPU limited to 380MHz...)

It's a real dedicated vCPU. No limit, reserved just for us.

> Is Apache the only one consuming high cpu percentage?

Yes, just apache.. (my next message will give you some simple dstat outputs,
so maybe you can confirm what I am measuring..

> Is Horde configured to use caching?
> What database do you use?
> 
> > For example, marking 10 messages as read will cause it. Clients Outlook
is
> > signaling waiting for server answer..
> >
> 
> Outlook has numerous issues you can see in the list archive. What is
> happening with some mobile client?

Yes, I know.. just search the Horde-BUG-List and you'll find my name
numerous times speaking about OL2013.

> 
> Regards
> 
> Andreas
> 
> 
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