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<H2><A ID="SECTION00042000000000000000">
3.2 Running on parallel machines</A>
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<P>
Parallel execution is strongly system- and installation-dependent.
Typically one has to specify:
<OL>
<LI>a launcher program such as <TT>mpirun</TT> or <TT>mpiexec</TT>,
with the appropriate options (if any);
</LI>
<LI>the number of processors, typically as an option to the launcher
program;
</LI>
<LI>the program to be executed, with the proper path if needed;
</LI>
<LI>other Q<SMALL>UANTUM </SMALL>ESPRESSO-specific parallelization options, to be
read and interpreted by the running code.
</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 it is very important
for good performances. We refer to the next
section for a description of the various
possibilities.
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