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4.1 Running on parallel machines
</H2>
<P>
Parallel execution is strongly system- and installation-dependent.
Typically one has to specify:
<OL>
<LI>a launcher program (not always needed),
such as <TT>poe</TT>, <TT>mpirun</TT>, <TT>mpiexec</TT>,
with the appropriate options (if any);
</LI>
<LI>the number of processors, typically as an option to the launcher
program, but in some cases to be specified after the name of the
program to be
executed;
</LI>
<LI>the program to be executed, with the proper path if needed: for
instance, <TT>./neb.x</TT>, or <TT>$HOME/bin/neb.x</TT>, or
whatever applies;
</LI>
<LI>other <TT>PWscf</TT>-specific parallelization options, to be
read and interpreted by the running code;
</LI>
<LI>the number of image groups used by NEB (see next subsection).
</LI>
</OL>
Items 1) and 2) are machine- and installation-dependent, and may be
different for interactive and batch execution. Note that large
parallel machines are often configured so as to disallow interactive
execution: if in doubt, ask your system administrator.
Item 3) also depend on your specific configuration (shell, execution
path, etc).
Item 4) is optional but may be important: see the following section
for the meaning of the various options.
<P>
For illustration, here is how to run <TT>neb.x</TT> on 16 processors partitioned into
4 image groups (4 processors each), for a path containing at least 4 images with POE:
<PRE>
poe neb.x -procs 16 -ni 4 -i input
</PRE>
<P>
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