[Pw_forum] file size limit exceeded

Axel Kohlmeyer axel.kohlmeyer at theochem.ruhr-uni-bochum.de
Mon Mar 28 12:31:07 CEST 2005

On Mon, 28 Mar 2005 15:47:19 +0530 (IST)  Jaita Paul wrote:

> Hi.

dear jaita,

> while running a  code (pw.x) it stopped giving the following message:
> [1]+  File size limit exceedednohup ../../bin/pw.x
> on checking the tmp directory i found the size of the wavefuntion file to
> be  ~ 2GB.
> so if i am to run programs which requires such disk space how am i to do it?
> i'm running it on a 32 bit machine with the following specifications:
> P4- 3.0 GHz,4GB RAM.

the message may appear for a number of reasons with different resolutions:
- the easiest way to resolve it, it so plainly avoid the problem
  and use a 64bit machine (e.g. opteron, itanium, alpha, etc.)
- your operating system/kernel/file system may not include the large file
  support for 32bit systems:
  -> update to a newer distribution
- your fortran compiler runtime does not support large files:
  -> update to a newer compiler
- maximum file size has been limited by your sysadmin:
   have a look at the output of 'ulimit -s'.
   if there is a limit for the file size, try 'ulimit -f unlimited'
   and if that does not help, talk to your sysadmin. 
- if all of the above are not doable, you can still try running 
  in parallel. each parallel instance will write its own, smaller
  wavefunction file. this may however give rise to problems on
  postprocessing (see the mailing list archive) and will reduce
  the performance of pw.x significantly.


> Regards,
> Jaita
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> Pw_forum at pwscf.org
> http://www.democritos.it/mailman/listinfo/pw_forum


Axel Kohlmeyer      e-mail:  axel.kohlmeyer at theochem.ruhr-uni-bochum.de
Lehrstuhl fuer Theoretische Chemie          Phone: ++49 (0)234/32-26673
Ruhr-Universitaet Bochum - NC 03/53         Fax:   ++49 (0)234/32-14045
D-44780 Bochum                   http://www.theochem.ruhr-uni-bochum.de
If you make something idiot-proof, the universe creates a better idiot.

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