\comment{
\begin{figure}[htb]
\begin{center}
\small
\begin{tabular}{|c|l||r|r|r|r|}
\hline 
\multicolumn{2}{|c||}{subdomains} & 
\multicolumn{1}{c|}{sf10} & 
\multicolumn{1}{c|}{sf5} &
\multicolumn{1}{c|}{sf2} &
\multicolumn{1}{c|}{sf1} \\ 
\hline
\hline
	&comp	&13.8	&59.8	&	&\\
4	&comm	&1.6	&3.4	&	&\\
	&total	&15.4	&63.2	&	&\\
\hline
	&comp	&7.2	&30.0	&	&\\
8	&comm	&1.2	&3.1	&	&\\
	&total	&8.4	&33.1	&	&\\
\hline
	&comp	&3.8	&15.5	&195.8	&\\
16	&comm	&1.4	&2.4	&14.0	&\\
	&total	&5.2	&17.9	&209.8	&\\
\hline
	&comp	&1.9	&7.9	&99.3	&\\
32	&comm	&1.7	&2.4	&10.0	&\\
	&total	&3.6	&10.3	&109.3	&\\
\hline
	&comp	&1.0	&4.2	&51.4	&329.0\\
64	&comm	&1.8	&2.6	&7.8	&27.6\\
	&total	&2.8	&6.8	&59.2	&356.6\\
\hline
	&comp	&0.6	&2.2	&26.5	&167.5\\
128	&comm	&2.2	&2.5	&7.3	&18.4\\
	&total	&2.8	&4.7	&33.8	&185.9\\
\hline
\end{tabular}
\end{center}
\caption{Running time of matrix-vector product on Cray T3D (ms, 3 dof)}
\label{fig:mvperf}
\end{figure}
}