Re: System freezes when RAM is full (64-bit)

[Ivan Danov <huhavel@gmail.com>]

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Here you can find attached the script, collecting the logs and the logs 
themselves during the described process of freezing. It appeared that 
the previous logs are corrupted, because both /proc/vmstat and 
/proc/meminfo have been logging to the same file.
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On 05/04/13 13:59, Michal Hocko wrote:
> On Fri 05-04-13 12:13:11, Ivan Danov wrote:
>> Tried with vm.swappiness=60, but the only improvement is that now
>> the mouse input is less choppy than before, but still the problem
>> remains - the computer is not usable at all, one could not even stop
>> the program, causing the problem.
> OK, could you collect /proc/vmstat and /proc/meminfo during that load?
>
>> Best,
>> Ivan
>> --
>> On 04/04/13 17:16, Michal Hocko wrote:
>>> On Thu 04-04-13 16:10:06, Ivan Danov wrote:
>>>> Hi Michal,
>>>>
>>>> Yes, I use swap partition (2GB), but I have applied some things for
>>>> keeping the life of the SSD hard drive longer. All the things I have
>>>> done are under point 3. at
>>>> http://www.rileybrandt.com/2012/11/18/linux-ultrabook/.
>>> OK, I guess I know what's going on here.
>>> So you did set vm.swappiness=0 which (for some time) means that there is
>>> almost no swapping going on (although you have plenty of swap as you are
>>> mentioning above).
>>> This shouldn't be a big deal normally but you are also backing your
>>> /tmp on tmpfs which is in-memory filesystem. This means that if you
>>> are writing to /tmp a lot then this content will fill up your memory
>>> which is not swapped out until the memory reclaim is getting into real
>>> troubles - most of the page cache is dropped by that time so your system
>>> starts trashing.
>>>
>>> I would encourage you to set swappiness to a more reasonable value (I
>>> would use the default value which is 60). I understand that you are
>>> concerned about your SSD lifetime but your user experience sounds like a
>>> bigger priority ;)
>>>
>>>> By system freezes, I mean that the desktop environment doesn't react
>>>> on my input. Just sometimes the mouse is reacting very very choppy
>>>> and slowly, but most of the times it is not reacting at all. In the
>>>> attached file, I have the output of the script and the content of
>>>> dmesg for all levels from warn to emerg, as well as my kernel config.
>>> I haven't checked your attached data but you should get an overview from
>>> Shmem line from /proc/meminfo which tells you how much shmem/tmpfs
>>> memory you are using and grep "^Swap" /proc/meminfo will tell you more
>>> about your swap usage.
>>>
>>>> Best,
>>>> Ivan
>>> HTH


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