[Pw_forum] Fwd: Mixed MPI-OpenMP
On Jul 24, 2009, at 18:57 , Paolo Giannozzi wrote: >DFLAGS=...-D__OPENMP _D__FFTW (or -D__ESSL if you have an IBM >machine with ESSL and AIX, -D__ESSL_LINUX with ESSL and Linux) > >compilation flags for openmp (-openmp for ifort) > >openMP-aware libraries (essl, mkl, acml I think) > >OMP_NUM_THREADS set to the number of desired processes in the >script that submits the job correction: DFLAGS=...-D__OPENMP _D__FFTW + ifort -openmp + mkl is tested and safe; other combinations may still run into trouble due to conflicts between "internal" OpenMP and autothreading libraries. P. --- Paolo Giannozzi, Dept of Physics, University of Udine via delle Scienze 208, 33100 Udine, Italy Phone +39-0432-558216, fax +39-0432-558222
[Pw_forum] Fwd: Mixed MPI-OpenMP
Eduardo Ariel Menendez Proupin wrote: > 1) How should one compile and run? I could not find it on the manual. because it is not (yet) there: the mixed mpi-openmp parallelization is still for the brave. If you feel brave: DFLAGS=...-D__OPENMP _D__FFTW (or -D__ESSL if you have an IBM machine with ESSL and AIX, -D__ESSL_LINUX with ESSL and Linux) compilation flags for openmp (-openmp for ifort) openMP-aware libraries (essl, mkl, acml I think) OMP_NUM_THREADS set to the number of desired processes in the script that submits the job Paolo -- Paolo Giannozzi, Democritos and University of Udine, Italy
[Pw_forum] Fwd: Mixed MPI-OpenMP
Hi, I read the following in Paolo's announcement of version 4.1 * mixed openMP-MPI parallelization: both CP and PWscf have been demonstrated to run on 65536 processors 1) How should one compile and run? I could not find it on the manual. 2) Could someone, please, suggest a strategy to mix OpenMP and MPI efficiently? How many OpenMP threads per node, how many MPI processes per node? Just not to begin experimenting from the ground. For a test case, I have a cluster infiniband-connected, where each node have two Quadcore Xeons, i.e., 8 cores per node. Thanks, -- Eduardo Menendez Departamento de Fisica Facultad de Ciencias Universidad de Chile Phone: (56)(2)9787439 URL: http://fisica.ciencias.uchile.cl/~emenendez -- next part -- An HTML attachment was scrubbed... URL: http://www.democritos.it/pipermail/pw_forum/attachments/20090724/863fd07f/attachment.htm
