Re: Allocation failures

... at least it's enabled in my kernel, but I can't tell you if this  
will solve your problem.

Le 4 juin 07 à 18:18, David Brodbeck a écrit :

> It looks like the kernel was compiled with 4 GB support, so that  
> should be OK.
>
> I wonder if enabling HIGHMEM I/O Support would help?  I'm  
> suspicious I'm running out of space in the low memory area, so  
> maybe shifting the I/O buffers to high memory would mitigate the  
> problem.
>
>
> On Jun 4, 2007, at 6:23 AM, Jürgen Knödlseder wrote:
>
>> What memory option did you use to compile the kernel? I was told that
>> 64 GB HIMEM is not supported, so I'm now running with the 4 GB option
>> (which in fact does not allow me to use the full memory of my
>> machines :-( Since I used the 4 GB option I did not encounter any
>> problems anymore (I has stability problems with 64 GB ...)
>>
>> Jürgen
>>
>> Le 4 juin 07 à 11:54, Ralf Oelschlaegel a écrit :
>>
>>> David Brodbeck schrieb:
>>>> I'm managing an OpenMosix cluster, running kernel 2.4.26-om1 on
>>>> Debian Sarge.  After the head node has been up for a couple of  
>>>> weeks
>>>> I start seeing a lot of allocation failure messages in the kernel
>>>> logs.  The situation eventually deteriorates to the point where the
>>>> machine is unusable -- all attempts to launch processes end with  
>>>> fork
>>>> reporting allocation failures.  The problem does not appear to be
>>>> memory exhaustion; the machine has 4 GiB of RAM and never uses more
>>>> than 100 megabytes or so of swap.
>>>>
>>>> Has anyone else seen this problem?  Is this the infamous Linux  
>>>> 2.4.x
>>>> 'memory fragmentation' issue rearing its ugly head?  Is there a  
>>>> fix?
>>> we use the same kernel on SuSE8.2 system and we have the same
>>> problem. After one
>>> month I have to reboot the master node and I think the problem is
>>> memory
>>> fragmantation (see memory/rawmemory on master by mosmon).
>>> Our "workaround" is checkpoint/restart for long running jobs.
>>>
>>> Ralf
>>>
>>>
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> David Brodbeck
> Information Technology Specialist 3
> Computational Linguistics
>
>
>
>
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