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4 Parallelism
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<P>
The <TT>PWneb</TT> code is interfaced to <TT>PWscf</TT>, which is used as computational engine
for total energies and forces. It can therefore take advantage from the two
parallelization paradigms currently implemented in Q<SMALL>UANTUM </SMALL>ESPRESSO, namely
Message Passing Interface (MPI) and OpenMP threads, and exploit
all <TT>PWscf</TT>-specific parallelization options.
For a detailed information about parallelization in Q<SMALL>UANTUM </SMALL>ESPRESSO,
please refer to the general documentation.
<P>
As <TT>PWneb</TT> makes several independent evaluations of energy and forces at each step of
the path optimization (one for each point in the configurational space,
called ``image'', consituting the path)
it is possible to distribute them among processors using an additional level of
parallelization (see later).
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