[Pw_forum] Max. no. of processors

[Nichols A. Romero]

Give that a try. Depending on the nature of the problem, it may not easily
parallelize to that many processors.


On 8/31/07, Bhagawan Sahu <brsahu at physics.utexas.edu> wrote:
>
>
> Dear PWSCF users,
>
> For a 288 processors jog on a linux cluster), I got the error message
> as
>
>
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> task #       140     from startup : error #       288
>      too many processors
>
>
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
>
>
>
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
>     task #        99
>     from startup : error #       288
>      too many processors
>
>
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
>
>
> In PW/para.f90
>
> MODULE para_const
>
>
> !----------------------------------------------------------------------------
> !
> SAVE
> !
> INTEGER, PARAMETER :: &
> #if defined(__QK_USER__)
>      maxproc  = 2048     !  maximum number of processors.
>                          !  make it big for 'big iron'.
> #else
>      maxproc  = 128      !  maximum number of processors
> #endif
> END MODULE para_const
>
>
> Do I have to change
>
> #else
>      maxproc  = 128      !  maximum number of processors
>
> to a large number (say 1000 or anything greater than I need) and recompile
> the code again and this will take care of the error.
>
> Bhagawan Sahu
> Microelectronics Research Center
> University of Texas at Austin
> Austin TX 78758
>
> _______________________________________________
> Pw_forum mailing list
> Pw_forum at pwscf.org
> http://www.democritos.it/mailman/listinfo/pw_forum
>



-- 
Nichols A. Romero, Ph.D.
DoD User Productivity Enhancement and Technology Transfer (PET) Group
High Performance Technologies, Inc.
Reston, VA
443-567-8328 (C)
410-278-2692 (O)
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.quantum-espresso.org/pipermail/users/attachments/20070831/fdc00d1a/attachment.html>