Hi,
 
thanks for your response!
 
Now, i already solved the problem, but it's possible a bug?
 
If i use the default values:
default_vsz_limit = 256M
service lmtp {
  vsz_limit = $default_vsz_limit
}
 
After restart, i check the limits of the lmtp process:
Max data size             268435456          268435456          bytes     
 
The limit is 256KB instead of 256MB?
 
If i change the value to 512MB, the process limit is 512KB.
 
When i set "20000M" as limit, the process limit is really 20000MB.
 
I am using CentOS 7.4. and dovecot 2.2.33.2 (d6601f4ec).
 
Who is parseing the values from the unit (MB) to Bytes? Dovecot or a linux libary function??

Best regards,
Thomas Manninger
Gesendet: Montag, 15. Januar 2018 um 08:16 Uhr
Von: "Aki Tuomi" <aki.tuomi@dovecot.fi>
An: "Thomas Manninger" <DBGTMaster@gmx.at>, Dovecot@dovecot.org
Betreff: Re: Lmtp Memory Limit


On 14.01.2018 09:11, Thomas Manninger wrote:
> Hi,
>
> i am using dovecot 2.2.33.2 on CentOS 7.4.
>
> Since i upgraded from CentOS 7.2. to CentOS 7.4. (without upgrading dovecot), my dovecot sieve-pipe scripts crash with Out of memory:
> Out of memory (allocated 262144) (tried to allocate 8793 bytes)
>
> There are some memory limits in dovecot or sieve? Can i change this value?
>
> Kernel limitks:
> [root@xxx software]# ulimit -a
> core file size (blocks, -c) 0
> data seg size (kbytes, -d) unlimited
> scheduling priority (-e) 0
> file size (blocks, -f) unlimited
> pending signals (-i) 26505
> max locked memory (kbytes, -l) 64
> max memory size (kbytes, -m) unlimited
> open files (-n) 1024
> pipe size (512 bytes, -p) 8
> POSIX message queues (bytes, -q) 819200
> real-time priority (-r) 0
> stack size (kbytes, -s) 8192
> cpu time (seconds, -t) unlimited
> max user processes (-u) 26505
> virtual memory (kbytes, -v) unlimited
> file locks (-x) unlimited
>
>
> Dovecot is running as user mail:
> su mail
> bash-4.2$ ulimit -a
> core file size (blocks, -c) 0
> data seg size (kbytes, -d) unlimited
> scheduling priority (-e) 0
> file size (blocks, -f) unlimited
> pending signals (-i) 26505
> max locked memory (kbytes, -l) 64
> max memory size (kbytes, -m) unlimited
> open files (-n) 1024
> pipe size (512 bytes, -p) 8
> POSIX message queues (bytes, -q) 819200
> real-time priority (-r) 0
> stack size (kbytes, -s) 8192
> cpu time (seconds, -t) unlimited
> max user processes (-u) 4096
> virtual memory (kbytes, -v) unlimited
> file locks (-x) unlimited
>
> Can someone help me?
>
> Thanks for help!
>
> Best regards
> Thomas Manninger

Check 'doveconf service/lmtp' for dovecot imposed limits. If vsz_limit
is 18446744073709551615, it means default_vsz_limit is used. Check out
'doveconf default_vsz_limit'. You can then decide if you want to set
some limit for lmtp only or increase the default limit.
 
Aki