[Pw_forum] Performance problems due to files in outdir

[Paolo Giannozzi]

On Wed, 2013-05-08 at 09:48 +0200, Axel Kohlmeyer wrote:

> if there are some people here on the list that would be interested in
> having such a wrapper and would be volunteering some time testing and
> providing feedback, i might be tempted to give it a try and write such
> a wrapper.

inside QE there is actually a sort of "wrapper" (PW/src/buffers.f90)
that can read/write to file or to RAM depending upon the value of a
variable. It used to work for a single unit, but now it has been
extended to an arbitrary number of units. Apparently, on modern 
parallel machines, the less one writes to disk, the better.

P.
-- 
 Paolo Giannozzi, Dept. Chemistry&Physics&Environment, 
 Univ. Udine, via delle Scienze 208, 33100 Udine, Italy
 Phone +39-0432-558216, fax +39-0432-558222