Has anybody ever bothered to measure how many concurrent IMAP sessions dovecot can handle? I know it depends on hardware, filesystem, mailbox type etc., but what exactly controls the number and what have people on the list measured? p at rick -- state of mind Digitale Kommunikation http://www.state-of-mind.de Franziskanerstra?e 15 Telefon +49 89 3090 4664 81669 M?nchen Telefax +49 89 3090 4666 Amtsgericht M?nchen Partnerschaftsregister PR 563
* Patrick Ben Koetter <p at state-of-mind.de>:> Has anybody ever bothered to measure how many concurrent IMAP sessions dovecot > can handle? > > I know it depends on hardware, filesystem, mailbox type etc., but what exactly > controls the number and what have people on the list measured?We usually have 1200 simultaneous connections during the day, that'S about 8% of our total accounts on the box. -- 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 Wed, 2009-09-30 at 17:08 +0200, Patrick Ben Koetter wrote:> Has anybody ever bothered to measure how many concurrent IMAP sessions dovecot > can handle? > > I know it depends on hardware, filesystem, mailbox type etc., but what exactly > controls the number and what have people on the list measured?I think disk I/O limit comes first, then memory and finally CPU. I just tested on my desktop: imaptest clients=1000 - noop=100 delay=100 logout=0 So it basically just issues NOOP commands and does no disk I/O (opens no index files or anything). Looks like each imap process uses about 420 kB of memory (420 MB total according to "free" before/after). That's actually more than I thought. Wonder if I could decrease it.. -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 197 bytes Desc: This is a digitally signed message part URL: <http://dovecot.org/pipermail/dovecot/attachments/20090930/71868378/attachment-0002.bin>
On Qua, 2009-09-30 at 17:08 +0200, Patrick Ben Koetter wrote:> Has anybody ever bothered to measure how many concurrent IMAP sessions dovecot > can handle? > > I know it depends on hardware, filesystem, mailbox type etc., but what exactly > controls the number and what have people on the list measured? >We have about 3600 per server. -- Jose Celestino SAPO.pt::Systems http://www.sapo.pt --------------------------------------------------------------------- * Progress (n.): The process through which Usenet has evolved from smart people in front of dumb terminals to dumb people in front of smart terminals. -------------- 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://dovecot.org/pipermail/dovecot/attachments/20090930/add12f8b/attachment-0002.bin>
* Jose Celestino <japc at co.sapo.pt>:> On Qua, 2009-09-30 at 17:08 +0200, Patrick Ben Koetter wrote: > > Has anybody ever bothered to measure how many concurrent IMAP sessions dovecot > > can handle? > > > > I know it depends on hardware, filesystem, mailbox type etc., but what exactly > > controls the number and what have people on the list measured? > > > > We have about 3600 per server.Any headroom left or is this the maximum you can get? p at rick