Due to the ongoing performance issues with 2.0.x I switched back to 1.2.15 yesterday evening, with no changes to the machine or my users. (I migrated from 1.2.15 to 2.0.x by converting the existing config) Today, we have MUCH LESS load, with the same number of logins/min. I cannot say what exactly causes this immense increase in load, but one observation is that the time spent in system() has now dropped (user and iowait have stayed contant) to a third of the values I was seeing with 2.0.x. This evening I'll post some graphs showing two comparable 24 hour ranges. -- Ralf Hildebrandt Gesch?ftsbereich IT | Abteilung Netzwerk Charit? - Universit?tsmedizin Berlin Campus Benjamin Franklin Hindenburgdamm 30 | D-12203 Berlin Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962 ralf.hildebrandt at charite.de | http://www.charite.de
* Ralf Hildebrandt <Ralf.Hildebrandt at charite.de>:> Due to the ongoing performance issues with 2.0.x I switched back to > 1.2.15 yesterday evening, with no changes to the machine or my users. > > (I migrated from 1.2.15 to 2.0.x by converting the existing config) > > Today, we have MUCH LESS load, with the same number of logins/min. > > I cannot say what exactly causes this immense increase in load, but one > observation is that the time spent in system() has now dropped (user and > iowait have stayed contant) to a third of the values I was seeing with > 2.0.x. > > This evening I'll post some graphs showing two comparable 24 hour > ranges.I uploaded a preliminary screenshot with comments: http://www.arschkrebs.de/bugs/dovecot.png During the night we're using clamdscan to scan mailboxes for viruses, this results in the big block of system & user from 0:00 until about 08:00 -- Ralf Hildebrandt Gesch?ftsbereich IT | Abteilung Netzwerk Charit? - Universit?tsmedizin Berlin Campus Benjamin Franklin Hindenburgdamm 30 | D-12203 Berlin Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962 ralf.hildebrandt at charite.de | http://www.charite.de
On Fri, Nov 5, 2010 at 5:58 AM, Ralf Hildebrandt <Ralf.Hildebrandt at charite.de> wrote:> I uploaded a preliminary screenshot with comments: > http://www.arschkrebs.de/bugs/dovecot.png >Unclear from your graphs what is for 2.0 and what is for 1.2 Plotting the same variable for 2.0 and 1.2 data on the same graph will be more convincing.
* zhong ming wu <mr.z.m.wu at gmail.com>:> On Fri, Nov 5, 2010 at 5:58 AM, Ralf Hildebrandt > <Ralf.Hildebrandt at charite.de> wrote: > > I uploaded a preliminary screenshot with comments: > > http://www.arschkrebs.de/bugs/dovecot.png > > > > Unclear from your graphs what is for 2.0 and what is for 1.2Left of "switching back to 1.2.x" is 2.0 Right of "switching back to 1.2.x" is 1.2.x As you can see (sind the graph spans exactly 24h) the load on the left end (2.0) is way higher then on the right end. And you did read my comment about "preliminary screenshot"? -- Ralf Hildebrandt Gesch?ftsbereich IT | Abteilung Netzwerk Charit? - Universit?tsmedizin Berlin Campus Benjamin Franklin Hindenburgdamm 30 | D-12203 Berlin Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962 ralf.hildebrandt at charite.de | http://www.charite.de
Ralf Hildebrandt put forth on 11/5/2010 4:23 AM:> Due to the ongoing performance issues with 2.0.x I switched back to > 1.2.15 yesterday evening, with no changes to the machine or my users. > > (I migrated from 1.2.15 to 2.0.x by converting the existing config) > > Today, we have MUCH LESS load, with the same number of logins/min. > > I cannot say what exactly causes this immense increase in load, but one > observation is that the time spent in system() has now dropped (user and > iowait have stayed contant) to a third of the values I was seeing with > 2.0.x. > > This evening I'll post some graphs showing two comparable 24 hour > ranges.Hi Ralf, What hardware platform? (AMD/Intel/SPARC/PPC, generation/freq) What OS platform? What compiler/version? What threading library? If IPC is the culprit, it may very well be a platform/compiler/system library issue and not a dovecot issue, given no one else seems to be suffering this problem. -- Stan
* Stan Hoeppner <stan at hardwarefreak.com>:> What hardware platform? (AMD/Intel/SPARC/PPC, generation/freq)Intel(R) Xeon(R) CPU L5335 @ 2.00GHz> What OS platform?Debian lenny> What compiler/version?gcc version 4.4.5 (Debian 4.4.5-2)> What threading library?? how do I find out?> If IPC is the culprit, it may very well be a platform/compiler/system > library issue and not a dovecot issue, given no one else seems to be > suffering this problem.-- Ralf Hildebrandt Gesch?ftsbereich IT | Abteilung Netzwerk Charit? - Universit?tsmedizin Berlin Campus Benjamin Franklin Hindenburgdamm 30 | D-12203 Berlin Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962 ralf.hildebrandt at charite.de | http://www.charite.de