[Wannier] wannier90 + vasp parallelism
szaboa at iis.ee.ethz.ch
Tue Jul 22 16:36:24 CEST 2014
Dear Wannier90 users,
I have noticed that calculating the initial projections for wannier90
with VASP doesn't speed up with the number of CPU-s used. Is it an
installation error, or is it only implemented in sequential, like
wannier90.x itself? And is it the same with other dft-tools (quantum
With large supercells it's a very time consuming part, taking days for a
system with about 500 Wannier functions. I've somewhat circumvented the
problem by calculating separately the projections on the different atom
and orbital types, then concatenating (with proper indexing - I can
share my Matlab script if anyone is interested) the files, but it's
still very inefficient, because the same overlaps have to be calculated
first every time (I can't tell VASP that I only need the projections),
and on supercomputers, where only whole nodes can be reserved, still
only one cpu will work per node.
So I would appreciate any hints how to deal with large systems
efficiently, if anyone has any experience with it.
Thanks in advance!
(PhD student at ETH Zurich)
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