Centos 4.0 and 4.1 seem to have a memory leak somewhere and I can't find out what is doing it. I think it may be dovecot. I have installed hundreds of Linux machines, centos/redhat/suse in the past as firewalls and mail relays and use the same/similar methodolgy and config for each. I have found that since Centos 4.0 and 4.1 came along machines that have run well for years and months, suddenly and systematically start running out of memory after a few weeks/months of uptime. The symtpom is the load average goes up and up as the machine creeps into swap usage and eventually the machine has to be rebooted.... this only happened with the introduction of Centos 4 and of course that means Dovecot for the IMAP server.... hmmmm...... Anyone else seen this, P.
On Mon, 3 Oct 2005, Peter Farrow wrote:> this only happened with the introduction of Centos 4 and of course that means > Dovecot for the IMAP server....yes - on a 4 processor setup, I hit this early on. as I recall, I concluded there was a multi-processor threading issue in Dovecot, and so I fell back to the UW imap as a workaround. - Russ herrold
On Mon, 2005-10-03 at 10:43, Peter Farrow wrote:> Centos 4.0 and 4.1 seem to have a memory leak somewhere and I can't find > out what is doing it. I think it may be dovecot. > > I have installed hundreds of Linux machines, centos/redhat/suse in the > past as firewalls and mail relays and use the same/similar methodolgy > and config for each. > > I have found that since Centos 4.0 and 4.1 came along machines that have > run well for years and months, suddenly and systematically start running > out of memory after a few weeks/months of uptime. > > The symtpom is the load average goes up and up as the machine creeps > into swap usage and eventually the machine has to be rebooted.... > > this only happened with the introduction of Centos 4 and of course that > means Dovecot for the IMAP server.... > > hmmmm...... > > Anyone else seen this,Have you tried running dovecot under xinetd instead of as a long-running daemon? -- Les Mikesell lesmikesell at gmail.com
On Mon, 2005-10-03 at 16:43 +0100, Peter Farrow wrote:> Centos 4.0 and 4.1 seem to have a memory leak somewhere and I can't find > out what is doing it. I think it may be dovecot. > > I have installed hundreds of Linux machines, centos/redhat/suse in the > past as firewalls and mail relays and use the same/similar methodolgy > and config for each. > > I have found that since Centos 4.0 and 4.1 came along machines that have > run well for years and months, suddenly and systematically start running > out of memory after a few weeks/months of uptime. > > The symtpom is the load average goes up and up as the machine creeps > into swap usage and eventually the machine has to be rebooted.... > > this only happened with the introduction of Centos 4 and of course that > means Dovecot for the IMAP server.... > > hmmmm...... > > Anyone else seen this,There are memory leak problems with all kernels before 2.6.9-11.EL There may be some issues with that kernel too. Update 2 for EL4 should be released fairly soon, it will have a newer kernel that addresses some other memory leak issues. -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 189 bytes Desc: This is a digitally signed message part URL: <http://lists.centos.org/pipermail/centos/attachments/20051003/c5e90ccd/attachment-0002.sig>