\subsection{Compilation}

To compile \pastix{} with Out Of Core, compile it with \texttt{-DOOC}.\\
You can see some debug information with \texttt{-DDEBUG\_OOC}.\\

\subsection{Usage}

Three new \texttt{iparm} variables are used by \texttt{OOC} : 
\begin{description}
  \item{$iparm\left[47\right]$~:} Out of core memory limit wanted.
  \item{$iparm\left[48\right]$~:} Number of out of core thread (only one has been tested yet.
  \item{$iparm\left[49\right]$~:} Used by pastix to store the
    identification number of the current \pastix{} session (needed
    when  \pastix{} is called with multiple steps. Doesn't have to be
    set by user.
\end{description}

If the limit set by user is too small (less than two times computation
thread number times maximu cblk size)  an error should appear giving
the minimal limit. \\
If the limit is too close from this limit, the computation will be
very very long, specially updown.\\
