CCL:G: Duel cords processors and parallel calculations

[Herbert Fruchtl <herbert.fruchtl .. st-andrews.ac.uk>]

 Sent to CCL by: Herbert Fruchtl [herbert.fruchtl#,#st-andrews.ac.uk]
It would help to know WHAT you want to do in parallel. To use several
 cores at the same time, you need to
 1) Write the program for parallel execution
 2) Compile the program for parallel execution
 3) Run it in parallel.
If you have a parallel executable, i.e. 1) and 2) are taken care of,
 this leaves you with 3), which depends on the parallelization method
 (and the operating system).
 - If it's Gaussian, you need %NProcShared=2 in the input.
- If it's another OpenMP program, you have to set the environment
 variable OMP_NUM_THREADS (it depends on the OS how you do that).
 - If it's an MPI program, you need to run it via a parallel startup
 program (in most implementations this is called mpirun, but the syntax
 may vary. RTFM!).
 - If it's yet another parallelization method (PVM, GA, ...), RTFM! But
 since anybody who can't be bothered to mention his program is using
 Gaussian anyway...
   Herbert
 may abdelghani may01dz*|*yahoo.fr wrote:
>  dear CCLers,
> In any calculations, a duel core processors, using only one core for
>  this calculation, whereas the second rest inactive. I ask if it is any
>  possibility to help the tow cores of my processor to sharing a one
>  calculation, like what we do in the parallel calculations (both cores
>  do
>  a one task in the same time).
>  Thanks
>  
>  ------------------------------------------------------------------------
> Envoyé avec Yahoo! Mail
>  <http://us.rd.yahoo.com/mailuk/taglines/isp/control/*http://us.rd.yahoo.com/evt=52423/*http://fr.docs.yahoo.com/mail/overview/index.html>;.
>  Une boite mail plus intelligente.
 --
 Herbert Fruchtl
 EaStCHEM Fellow
 School of Chemistry
 University of St Andrews
 --
 The University of St Andrews is a charity registered in Scotland:
 No SC013532