2 messages in net.sourceforge.lists.courier-usersRe: [courier-users] High load trouble...
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Arnaud JAYETJan 25, 2005 5:28 am 
Gordon MessmerJan 25, 2005 9:13 am 
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Subject:Re: [courier-users] High load trouble when broadcasting mailActions...
From:Gordon Messmer (yiny@eburg.com)
Date:Jan 25, 2005 9:13:42 am
List:net.sourceforge.lists.courier-users

Arnaud JAYET wrote:

on the imap server i'm using debian woody + postfix 2.0.13 whith VDA patch for soft quota, courier-pop/imap 1.4.3, openldap as data backend (for postfix and courier-imap). ldap server is local on the imap server. ... When i broadcast a mail from my PC to all users (1700 emails), the load average on the imap server increases very high and very fast (up to 60 !). ... i did not modify postfix master.cf, So normally 100 daemons are possible simustaneoulsy for virtual delivery.

If you've configured Postfix to allow 100 simultanious deliveries, and inject a large number of messages, you should expect to see upwards of 100 active processes which spend very little time waiting for IO. In other words, those 100 processes will be largely in a runnable state, which means that load could approach 100.

If that's a problem, reduce the number of simultanious deliveries you allow.