Issue's with socketmap (smmapd) under heavy load?
anfi at priv.onet.pl
Wed Jul 14 15:23:58 EDT 2004
> 1) This looks odd to me, but here it is (ran through "time"):
> time emecho "/map melen at logical.net" | sendmail -bt -d60.5 -d38.20
> ldapmap_open(VirtHost, 0): opening new connection
> ldapmap_lookup(VirtHost, )
> seq_map_parse(aliases.files, )
> ADDRESS TEST MODE (ruleset 3 NOT automatically invoked)
> Enter <ruleset> <address>
>> No key specified
> real 0m0.026s
> user 0m0.020s
> sys 0m0.000s
time echo "/map cyrus melen at logical.net" | sendmail -bt -d60.5 -d38.20
In the command you had used the map name was missing.
> 2) smmapd cyrus.conf entry:
> smmapd cmd="/usr/lib/cyrus-imapd/smmapd"
> listen="/var/lib/imap/socket/socketmap" prefork=1
Looks OK [you may prefork more smmapd processess (5?) ]
> 3) ulimit -a:
> core file size (blocks, -c) 0
> data seg size (kbytes, -d) unlimited
> file size (blocks, -f) unlimited
> max locked memory (kbytes, -l) unlimited
> max memory size (kbytes, -m) unlimited
> open files (-n) 1024
> pipe size (512 bytes, -p) 8
> stack size (kbytes, -s) 10240
> cpu time (seconds, -t) unlimited
> max user processes (-u) 7168
> virtual memory (kbytes, -v) unlimited
It looks OK to me
> I'm just having bizare problems. I have 2 frontends and 1 backend in a
> configuration. If I have ANY kind of mail load incoming then the whole
> craps out (under what I'd consider very light load actually). I
> currently have
> 1 frontend setup to accept pop and imap connection and the other frontend
> running sendmail and delivering mail via lmtp. If I turn on sendmail,
> then all
> of a sudden my pop login times exceed 30 seconds. I'm quite at a loss. I
> know if it's a frontend problem or a backend problem.
30s delay make ident query the primary suspect.
1) Take a looka at the link below
Q3.12 -- Why do connections to the SMTP port take such a long time?
2) Check if you sendmail is compiled with TCPWRAPPERS
echo "" | sendmail -bt -d0.1 | grep TCP
TCPWRAPPERS uses external library which does its own ident lookups.
Andrzej [en:Andrew] Adam Filip anfi at priv.onet.pl anfi at xl.wp.pl
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