MailScanner high CPU usage

Martin Hepworth martinh at SOLID-STATE-LOGIC.COM
Mon Feb 9 10:34:17 GMT 2004

Adrian Voinea wrote:
> Hello, here's my problem:
> Sometimes, mailscanner uses a lot of cpu, for a long amount of time.
> The mail server's load average rises to ~13 and stays that way for a while.
> You can see the cpu hogs' activity in the strace output.
> (I searched for "shmat and umoven: Input/output error" on google and this
> error is obviously related to
> the high cpu usage:
> What do you think is wrong? Did anyone else encounter this problem?
> System configuration:
> Celeron 2.4
> 512 ram
> Kernel 2.4.23
> perl 5.6.1
> sendmail 8.12.11
> mailscanner 4.26.7, sa+bayes enabled
> spamassassin 2.63

Have you got RBL's setup in spamassassin? Also worth checking are the
numbers of messages you scan and one and the number of children you are

mine are.. (on a 600mhz Celeron and 512MB ram)..
Max Children = 5
Max Unscanned Messages Per Scan = 20
Max Unsafe Messages Per Scan = 20

Also worth checking the SA settings to make sure the rules parse properly..

spamassassin -D --lint -C /opt/MailScanner/etc/spam.assassin.prefs.conf

Martin Hepworth
Snr Systems Administrator
Solid State Logic
Tel: +44 (0)1865 842300


This email and any files transmitted with it are confidential and
intended solely for the use of the individual or entity to whom they
are addressed. If you have received this email in error please notify
the system manager.

This footnote confirms that this email message has been swept
for the presence of computer viruses and is believed to be clean.


More information about the MailScanner mailing list