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$\begin{figure} \par\includegraphics[width=16cm]{5231fig1.eps} \end{figure}$ Figure 1: a) Performance of the Gauss solver, LU solver and GMRES(50) solver with $\varepsilon =10^{-16}$ , 10^-6 or 10^-2; dotted lines are extended from the actual timing data for prediction purpose; diamonds indicate the extra experiments for confirming and correcting the prediction lines; CPU times for assembling the BEM matrices and extrapolating the fields for 15 layers are also plotted for reference purpose. b) Impact of the setting of $\varepsilon$ of the GMRES(50) solver on the accuracy of the extrapolated field. c) Impact of the Krylov dimension m on the convergence behaviour of the GMRES(m) solver for $\varepsilon =10^{-6}$ . d) Impact of the Krylov dimension m on the convergence behaviour of the GMRES(m) solver for $\varepsilon =10^{-2}$ .
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