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<H2><A ID="SECTION00053000000000000000">
4.3 File space requirements</A>
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<P>
A typical <TT>pw.x</TT> run will require an amount of temporary disk space in the
order of O double precision complex numbers:
<P><!-- MATH
\begin{displaymath}
O = N_k M N + q N_{r1} N_{r2}N_{r3}
\end{displaymath}
-->
</P>
<DIV ALIGN="CENTER">
<I>O</I> = <I>N</I><SUB>k</SUB><I>MN</I> + <I>qN</I><SUB>r1</SUB><I>N</I><SUB>r2</SUB><I>N</I><SUB>r3</SUB>
</DIV><P></P>
where <!-- MATH
$q = 2\times$
-->
<I>q</I> = 2× <TT>mixing_ndim</TT> (number of iterations used in
self-consistency, default value = 8) if <TT>disk_io</TT> is set to 'high'; q = 0
otherwise.
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