Peter Volkov wrote: > Hello. At my work we are trying to use exim4 as a mail gateway for our > news mailing lists with currently about 1000000 subscribers, thus we > need to send 10^6 mails daily or better twice faster since we want all > mails to proceed before they became too old. Currently we are using exim > 4.69-9 on Debian. After reading mailing archives we've enabled the > following options in exim configuration file: > > split_spool_directory > queue_run_max = 100 > remote_max_parallel = 200 > queue_only_load = 8 > deliver_queue_load_max = 12 > smtp_connect_backlog = 50 > smtp_accept_max = 500 > smtp_accept_queue_per_connection = 1000 > > We are running exim process with -odqs -q1m options. We've put hints > database (/var/spool/exim4/db) on tmpfs. And in result on Intel > Corporation E7520 with 2 Intel(R) Xeon(TM) CPU 3.00GHz, with 4G RAM and > IDE software raid1 exim is not enough fast (we've managed to send 15 000 > letters per 30 minutes) So the question is are there any hints how to > improve exim performance? > > Currently it looks like our performance bottleneck is our discs - > currently we use software raid to improve performance, but still we have > only about 50-70Mb speed (as hdparm states). But if we put, say scsi > disks does this makes us much faster? Or should we use some different > mail server software (suggestions, please?)? > > I found that to improve performance it was suggested to send to most > popular domains first but it's not very easy (not to say problematical) > in our setup. > > > Another problem is related to -odqs option. As I understand the manual > this option tels exim to do only routing and *no* delivery. Then why I > see the following messages in the log file: > > 2009-04-28 11:34:09 1LyhpP-0004TO-HX no immediate delivery: load average 9.40 > > ? Probably this is our performance bottleneck too? > > > In any case thank you for any hints, > -- > Peter. > >
What I've had luck with is putting the queues in a ram disk. Then setting it up with a fallback host so that if the message isn't delivered on the first try it transfers to another exim server that keeps the queues on a hard drive. I'm processing about 10 million messages a day on such a server (quad core phenom 8 gigs ram) and it works really well. Of course if someone yanks the plug out you lose the ram disk queue. -- ## List details at http://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
