[Dovecot] auth service: out of memory

[Mailing List SVR]

Il 29/06/2012 09:45, Timo Sirainen ha scritto:
> On 29.6.2012, at 10.39, Mailing List SVR wrote:
>
>> Il 29/06/2012 09:19, Timo Sirainen ha scritto:
>>> On 29.6.2012, at 9.35, Mailing List SVR wrote:
>>>
>>>> I have some out of memory errors in my logs (file errors.txt attached)
>>> How large is your auth process's VSZ when it starts up and has handled a couple of logins? It's possible that it's not leaking at all, you're just not giving enough memory for its normal operation. Some Linux distros nowadays build binaries that eat up a lot of VSZ immediately when they start up.
>>>
>>>
>> ps aux report this:
>>
>> dovecot   7454  0.0  0.0  85980  3776 ?        S    09:36   0:00 dovecot/auth
>>
>> before restarting dovecot the auth process was running since about 1 hour and this is the output from ps aux
>>
>> dovecot  25002  0.0  0.0  86112  3780 ?        S    08:24   0:00 dovecot/auth
> So you have 44 MB of VSZ available after startup. You also have 10 MB of auth cache, which could in reality take somewhat more than 10 MB. It doesn't leave a whole lot available for regular use. I'd increase the auth process's VSZ limit and see if it still crashes.

I increased the limit to 192MB or should I set the limit to 256MB or 
more? I'll wait some days to see if still crash

>
> If you want to, you could also test with valgrind if there's a leak:
>
> service auth {
>    executable = /usr/bin/valgrind --leak-check=full -q /usr/libexec/dovecot/auth
> }
>
> You'd then need to restart the auth process to make valgrind output the leaks.

for now I prefer to avoid valgrind on a production server if the crash 
persist with the new limit I'll setup a test environment and I'll run 
valgrind there,

thanks
Nicola