A very slow MS 4.62.2-3 & SA 3.2.1 & ClamAV 0.91 machine

[Julian Field]

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Have you tried running it in debug mode with SA debug switched on too?
MailScanner -debug  -debug-sa
and press Ctrl-S to pause the output when it appears to stop for a bit. 
That will tell you why it is taking so long. In case you don't know, 
Ctrl-Q will resume the normal output again.

Chris Sweeney wrote:
> I have the same problem, on Sunday I upgraded a MailScanner box running
> RHEL 4 to the latest Spamassassin/ClamAV using the tar file from the site
> and I went on that machine, (2GIG RAM, 3GHZ processor) from less then 4
> seconds total processing time per message to now over 40 seconds per
> message.  40 seconds is good right now, it doesn't seem to be anything to
> do with MailScanner it seems to be hanging at the virus/spamassassin
> scanning.
>
> Chris
>
>
>   
>> I have five mail gateways. Here are a few things I've done that helped a
>> lot.
>>
>> The item that made the biggest difference was changing 'Max Unscanned
>> Messages Per Scan = 30' to 10, and changing 'Max Unsafe Messages Per Scan
>> = 30' to 10 as well.
>>
>> I also increased my "Max Children" to 10, but I'm still working on
>> tweaking that (only been running MailScanner in production for a week
>> now).
>>
>> I had one machine that could not keep up with the volume of mail. I
>> couldn't figure out why one machine was having trouble when the rest were
>> doing fine. Soon I discovered that Spamassassin was causing a huge slow
>> down on that one box. It was hanging for ever on checking if dns was
>> avaiable or not. I set 'dns_available no' in the spam.assassin.prefs.conf
>> file and things sped waaayyy up. I changed it on my other relays and it
>> made a significant different on them as well, but not as much as the one
>> relay that couldn't keep up with mail orginially. I still haven't figured
>> out why it so greatly effected that one machine.
>>
>> Hope that helps.
>>
>> Good luck.
>>
>> David Gottschalk
>> Emory University Infrastructure Technology Services
>> david.gottschalk at emory.edu
>>
>> -----Original Message-----
>> From: mailscanner-bounces at lists.mailscanner.info
>> [mailto:mailscanner-bounces at lists.mailscanner.info] On Behalf Of Quentin
>> Campbell
>> Sent: Thursday, July 12, 2007 11:37 AM
>> To: MailScanner discussion
>> Subject: A very slow MS 4.62.2-3 & SA 3.2.1 & ClamAV 0.91 machine
>>
>> I have a very slow mail gateway among the 4 that I have just upgraded.
>>
>> They all run MS 4.62.2-3, SA 3.2.1 and ClamAV 0.91 and should have
>> identical configurations for MS and SA. MCP processing is done and it is
>> the same on all 4.
>>
>> There were 211 batches of 30 messages each processed on the slow machine.
>> Overall the average time to process each message is 15 seconds!
>>
>> The last two of these batches were processed by running MailScanner in
>> debug mode. The average processing time for each message then dropped to
>> between 2 and 3 seconds!
>>
>> I am trying to get a handle on why this machine is so slow. Any
>> suggestions to help further my investigation are welcome.
>>
>> Quentin
>> ---
>> PHONE: +44 191 222 8209    Information Systems and Services (ISS),
>>                            Newcastle University,
>>                            Newcastle upon Tyne,
>> FAX:   +44 191 222 8765    United Kingdom, NE1 7RU.
>> ------------------------------------------------------------------------
>>
>>
>>
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>>
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>>
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>>
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>>
>> Support MailScanner development - buy the book off the website!
>>
>> --
>> This message has been scanned for viruses and
>> dangerous content by MailScanner, and is
>> believed to be clean.
>>
>>
>>     
>
>
>   

Jules

- -- 
Julian Field MEng CITP
www.MailScanner.info
Buy the MailScanner book at www.MailScanner.info/store

MailScanner customisation, or any advanced system administration help?
Contact me at Jules at Jules.FM

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For all your IT requirements visit www.transtec.co.uk


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-- 
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.
For all your IT requirements visit www.transtec.co.uk