Re: Allocation failures

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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