Too much uptime !
MailScanner at ecs.soton.ac.uk
Mon Oct 10 19:05:18 IST 2005
[ The following text is in the "ISO-8859-1" character set. ]
[ Your display is set for the "US-ASCII" character set. ]
[ Some characters may be displayed incorrectly. ]
-----BEGIN PGP SIGNED MESSAGE-----
High load average figures from "uptime" are not an indication at all
that your system is overloaded. It gives the average number of processes
in the run queue. If a process is waiting for disk, it adds 1. If a
process is waiting for network response, it adds 1. It doesn't mean
anything is overloaded at all.
A load average of 3 means there are an average of 3 processes waiting
for cpu, disk or network. Since you have 4 CPUs then 1 of them is idle.
A load of 12 to 15 on a hard-working single cpu system is perfectly
common, it just means that all your system resources are being
I usually recommend 5 children per CPU. So you should start by setting
it to 20.
The Queue Scan Interval won't make any difference, I might remove it
some time. It only affects the behaviour of the system when there are
very few incoming messages. In all other situations it will process as
many messages as it can without waiting for anything. It doesn't mean
that MailScanner always waits 40 seconds to collect messages. If there
are any messages waiting at all, then they are immediately processed.
Leave it at 6.
With a load average of 3 on a box with 4 cpu's, you've wasted your money
as at least 1 cpu isn't even doing anything. A load average of 30 or 40
would mean your machine is working for its dinner.
Rabellino Sergio wrote:
> Dear list,
> i'm getting an high uptime on my mailscanner box, and this is a new
> behaviour for me.
> The load average persist over 3.00 and my mail traffic is not so high.
> My actual config is
> MailScanner Rel4.45.4 - McAfee VirusScan - ClamAV cmd line - SA 3.0.4
> Max Children = 5
> Queue Scan Interval = 40
> I've changed The Scan Interval from 5 seconds to 40 and the max
> children from 10 to 5, but without any significant change in the load.
> My Solaris 9 box is an V440 with 4GB of ram and 4 ultrasparc CPU.
> Where I need to investigate ? From a simple check, seems that 2
> MailScanner processes are statically in O-state and three are in
> either R/S state: it's normal ?
Buy the MailScanner book at www.MailScanner.info/store
Professional Support Services at www.MailScanner.biz
MailScanner thanks transtec Computers for their support
PGP footprint: EE81 D763 3DB0 0BFD E1DC 7222 11F6 5947 1415 B654
-----BEGIN PGP SIGNATURE-----
Version: PGP Desktop 9.0.2 (Build 2424)
-----END PGP SIGNATURE-----
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.
------------------------ MailScanner list ------------------------
To unsubscribe, email jiscmail at jiscmail.ac.uk with the words:
'leave mailscanner' in the body of the email.
Before posting, read the Wiki (http://wiki.mailscanner.info/) and
the archives (http://www.jiscmail.ac.uk/lists/mailscanner.html).
Support MailScanner development - buy the book off the website!
More information about the MailScanner