Re: Cyrus 2.3.16 : pop3d processes performing reads on files in 'stage.' subdirs.
On Tue, August 14, 2012 6:50 pm, Bron Gondwana wrote: On Tue, Aug 14, 2012, at 01:22 PM, Eric Luyten wrote: On Tue, August 14, 2012 1:06 pm, Bron Gondwana wrote: On Tue, Aug 14, 2012, at 11:07 AM, Eric Luyten wrote: All, Using dtrace on Solaris 10 I was having a look at our Cyrus server I/O activity and I cannot explain myself why pop3d processes carry out read operations on files in the 'stage.' subdirectories. Is it reading them by name, or just the same inode? There are no long lived links in our 'stage.' subdirs. % !! ls -l /cyr[1-9]/stage./* No match % We do re-use pop3 and imap server processes, though. (-U 10 parameter on pop3d and imapd entries in /etc/cyrus.conf) We also observe writes to the 'stage.' subdirs by imapd processes but this is to be expected, isn't it ? It's the pop3 processes behaviour which is puzzling me. Yeah, puzzles me too - you can't APPEND messages via pop3, which is the only reason that it would need to use the stage directories. Bron, I was thinking along the lines lmtpd processes not having closed file descriptors on very recently delivered messages (and there indeed appears to be a connection between recent delivery and POP3 session) so I restarted our Cyrus 2.3.16 server with -U 1 parameters on the POP3, IMAPD en LMTPD processes. But ... This appears to have no effect at all (Solaris 10 here) : all three types of processes get reused hundreds of times. Eric Luyten, Computing Centre VUB/ULB. Cyrus Home Page: http://www.cyrusimap.org/ List Archives/Info: http://lists.andrew.cmu.edu/pipermail/info-cyrus/ To Unsubscribe: https://lists.andrew.cmu.edu/mailman/listinfo/info-cyrus
Re: Cyrus 2.3.16 : pop3d processes performing reads on files in 'stage.' subdirs.
On Tue, Aug 14, 2012, at 11:07 AM, Eric Luyten wrote: All, Using dtrace on Solaris 10 I was having a look at our Cyrus server I/O activity and I cannot explain myself why pop3d processes carry out read operations on files in the 'stage.' subdirectories. Is it reading them by name, or just the same inode? Bron. -- Bron Gondwana br...@fastmail.fm Cyrus Home Page: http://www.cyrusimap.org/ List Archives/Info: http://lists.andrew.cmu.edu/pipermail/info-cyrus/ To Unsubscribe: https://lists.andrew.cmu.edu/mailman/listinfo/info-cyrus
Re: Cyrus 2.3.16 : pop3d processes performing reads on files in 'stage.' subdirs.
On Tue, August 14, 2012 1:06 pm, Bron Gondwana wrote: On Tue, Aug 14, 2012, at 11:07 AM, Eric Luyten wrote: All, Using dtrace on Solaris 10 I was having a look at our Cyrus server I/O activity and I cannot explain myself why pop3d processes carry out read operations on files in the 'stage.' subdirectories. Is it reading them by name, or just the same inode? There are no long lived links in our 'stage.' subdirs. % !! ls -l /cyr[1-9]/stage./* No match % We do re-use pop3 and imap server processes, though. (-U 10 parameter on pop3d and imapd entries in /etc/cyrus.conf) We also observe writes to the 'stage.' subdirs by imapd processes but this is to be expected, isn't it ? It's the pop3 processes behaviour which is puzzling me. Eric Luyten, Computing Centre VUB/ULB. Cyrus Home Page: http://www.cyrusimap.org/ List Archives/Info: http://lists.andrew.cmu.edu/pipermail/info-cyrus/ To Unsubscribe: https://lists.andrew.cmu.edu/mailman/listinfo/info-cyrus
Re: Cyrus 2.3.16 : pop3d processes performing reads on files in 'stage.' subdirs.
On Tue, Aug 14, 2012, at 01:22 PM, Eric Luyten wrote: On Tue, August 14, 2012 1:06 pm, Bron Gondwana wrote: On Tue, Aug 14, 2012, at 11:07 AM, Eric Luyten wrote: All, Using dtrace on Solaris 10 I was having a look at our Cyrus server I/O activity and I cannot explain myself why pop3d processes carry out read operations on files in the 'stage.' subdirectories. Is it reading them by name, or just the same inode? There are no long lived links in our 'stage.' subdirs. % !! ls -l /cyr[1-9]/stage./* No match % We do re-use pop3 and imap server processes, though. (-U 10 parameter on pop3d and imapd entries in /etc/cyrus.conf) We also observe writes to the 'stage.' subdirs by imapd processes but this is to be expected, isn't it ? It's the pop3 processes behaviour which is puzzling me. Yeah, puzzles me too - you can't APPEND messages via pop3, which is the only reason that it would need to use the stage directories. Bron. -- Bron Gondwana br...@fastmail.fm Cyrus Home Page: http://www.cyrusimap.org/ List Archives/Info: http://lists.andrew.cmu.edu/pipermail/info-cyrus/ To Unsubscribe: https://lists.andrew.cmu.edu/mailman/listinfo/info-cyrus
