Re: Future of Qmail-LDAP

On Wed, Feb 03, 2010 at 05:11:54PM +0200, Ibrahim Harrani wrote:
> Hi Hugo,
> 
> Thanks for your prompt reply.
> The problem was CPU load not I/O in my tests and case.
> 
> Number of users is not important. I tested it 5-6 months ago but test
> sceneria is very simple.
> 1. Install netqmail
> 2. run tcpserver with 700 connection limit (tcpserver -c 700) and disable
> rbl any other IP level checks
> 3. configure xstress tool (http://xstress.sourceforge.net/) to open 600
> concurrent connection and only one mail every connection.
> 4. run xstress tool two or three time,
> 
> You will  see high cpu load(even in first test).
> The hardware  configuration has no big impact in this tests. I tried
> different configurations(soft raid/hard raid, SAS/SCSI, dual core/quad core
> CPU)
> I also tried to put qmail queue on ramdisk to isolate I/O, the result was
> same! the load is still higher than 50
> 
> Make same tests with postfix on the same server. the load will not be bigger
> than 2-3
> 

CPU load has not realy much todo with how busy a system is. It is possible
to have a cpu load of 1000 without even noticing it. It just means that
there are more processes ready to run.

-- 
:wq Claudio