Some Questions about Cyrus Agregattion ( Murder )

[Lucas Zinato Carraro]

Another Question:

  1 proxyd  = 1 client connection ? Or 1 proxyd handles several connections ?
This parameter can be configured ?

Any metric to sizing  IO Use for frontends and backends ??


Regards


On Tue, Jun 22, 2010 at 2:48 PM, Andrew Morgan <morgan at orst.edu> wrote:
> On Tue, 22 Jun 2010, Lucas Zinato Carraro wrote:
>
>> Thanks for all answers,
>>
>>   " As Wes points out, proxyd process churn is relatively expensive."
>>
>> Any metric to "sizing"  a solution ?
>> ex: proxyd memory and cpu by connection
>>
>> I expect "20.000"  simultaneous connections in frontends ( 3 or 5
>>  machines )
>> 10.000 using IMAPs and 10.000 using IMAP.
>>
>> An maximum attachment set to 10 Mb.
>
> We have 3 frontend servers here, each with 2 dual-core AMD 280 cpus and 4GB
> of RAM.
>
> Our peak usage was about 4500 proxyd processes (1500 per server).  These are
> a mix of IMAP and IMAPS (I don't know the breakdown).  During those peak
> times, the load average was around 0.6 to 0.8.  Right now there are
> 800 proxyd processes consuming about 1GB of RAM.  There is almost zero
> memory used by proxyd that is not shared memory.
>
> If I had to guess at the peak capacity of my frontend servers, I'd say we
> could handle about 2000 proxyd processes each.
>
> Today, you could buy an 8 core, 8GB server and handle double the number of
> processes.  For your requirements, I'd buy 5 or 6 of those servers.
>
>        Andy
>