[Wien] Allocation error 494

[Torsten Andersen]

Hello Rebecca,

I would suspect the different kernels to cause the different behaviour. 
What Xeons are those? 64-bit or 32-bit? If they are 32-bit, anything 
addressing more than 2G will be very slow, and with some kernels, 
compilers, etc., even impossible, even when the hardware technically 
supports more than 2G.

Best regards,
Torsten Andersen.



Rebecca Nicholls wrote:
> hello everyone
> 
> I was wondering if anyone had ever had trouble with allocation
> errors on a 4G machine.  I sucessfully got a large job to start
> on a 2G machine, using 1.5G RAM and 1G swap.  When I try to run
> this same job on a 4G machine, I get allocation errors.  It seems
> I'm having trouble using more than 2G out of the 4G of ram, and 
> the program is not using any swap.  
> 
> I've changed the stacksize to unlimited:
> 
> cputime         unlimited
> filesize        unlimited
> datasize        unlimited
> stacksize       unlimited
> coredumpsize    0 kbytes
> memoryuse       unlimited
> vmemoryuse      unlimited
> descriptors     1024
> memorylocked    unlimited
> maxproc         7168
> 
> The 2G machine is a dual-processor (although I was only running
> the job on one processor) Xeon 2.2Gz running red hat linux (kernel 
> 2.4.18-3smp).
> 
> The 4G machine is a pentium 4 running suse (kernal 2.4.21-260-smp4G).
> 
> Thanks a lot
> Best wishes
> 
> Rebecca
> 
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-- 
Dr. Torsten Andersen        TA-web: http://deep.at/myspace/
AG Hübner, Department of Physics, Kaiserslautern University
http://cmt.physik.uni-kl.de    http://www.physik.uni-kl.de/

Symposium on Excited-state properties of solids, Mannheim 2005:
See: http://cmt.physik.uni-kl.de/XSM05/