[tor-relays] Ubuntu is killing tor when getting low memory

[David Stainton]

Hi Geri,

Oh good! Glad to hear you are experimenting.

It's nice to have some time series graphs (i can't recommend it but
the kids these days use a heavy weight time series graphing system
called graphite)
displaying various memory related properties of your server such as
those values found in /proc/meminfo
You can read about what these fields mean in:
linux/Documentation/filesystems/proc.txt

Often times it is possible to look at a stacked time series graph with
all these properties... and it tells you a story about what is going
on. Then you can make more informed decisions with regards to fixing
memory related problems.

Yes... I (and probably others on the tor-relays list) would be
interested in hearing from you if you figure out a solution to your
Linux memory management problems.

Cheers!

David

On Sun, Feb 2, 2014 at 2:17 PM, toxi roxi <toxiroxi at gmail.com> wrote:
> Hi David,
>
> thank you very much for your hints - i got now a better picture on how this
> could work on my ubuntu relay. Very interesting infos - thanks!
> I've setup some tweaks now - lets see how it works.
> If you are interested what i have did and if it helped - just let me know -
> i will drop you a message in a week or two.
>
> Thanks!
> Geri
>
>
> 2014-02-01 David Stainton <dstainton415 at gmail.com>:
>
>> Hi Geri!
>>
>> You may adjust the Linux OOM killer's settings on a per process basis
>> with the proc fs; see here:
>> http://askubuntu.com/questions/60672/how-do-i-use-oom-score-adj
>>
>> If you have multiple numa cores then it also might be helpful to set
>> the process to use numa interleaved memory
>> instead of just it's local numa memory bank... see numactl for more
>> information about that. Jeremy Cole wrote
>> an interesting article about tuning mysql with numactl a while back.
>>
>> Some people advise keeping a sacrificial lamb process that gets
>> oom-killed first.
>>
>> Also I always like to disable swap completely (e.g. swapoff -a)... but
>> sometimes I meet sys admins that
>> try to argue that having some swap is a good idea; i am not convinced.
>> swap is so 1992.
>>
>> I didn't explain everything or go into all the details here... so feel
>> free to ask me questions if you have some
>> problems or if something is unclear.
>>
>> Cheers!
>>
>> David
>>
>>
>> On Sat, Feb 1, 2014 at 12:41 PM, toxi roxi <toxiroxi at gmail.com> wrote:
>> > Hi Folks,
>> >
>> > im running many relays which are doing a nice job. But i have also some
>> > smaller relays outside which have just 256mb.
>> > They are performing quite quell - but on one relay im facing issues
>> > which i
>> > think you may help me.
>> >
>> > this relay seems to ran out of memory from time to time (2 to 5 days)
>> > and i
>> > found out via dmesg, that ubuntu itself is killing the process to free
>> > up
>> > memory.
>> > the swap is used, but far away from full.
>> >
>> > as this stops tor immediately its bit annoying that i need to restart
>> > the
>> > releay without any reason.
>> >
>> > is there any way to tell ubuntu or to prevent that the tor process is
>> > killed
>> > for freeing up memory?
>> >
>> > i dont care about other processes as this machine is for tor purposes
>> > only.
>> >
>> > thanks for your expertise!
>> > Geri
>> >
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>> >
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>
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