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<title>SuperLU: EXAMPLE/sp_ienv.c File Reference</title>
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Main Page
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Data Structures
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Files
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EXAMPLE/sp_ienv.c File Reference#include "slu_Cnames.h"
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Functions
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int sp_ienv (int ispec)
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Function Documentation
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int sp_ienv
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(
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int
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ispec
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)
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Purpose
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=======
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sp_ienv() is inquired to choose machine-dependent parameters for the
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local environment. See ISPEC for a description of the parameters.
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This version provides a set of parameters which should give good,
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but not optimal, performance on many of the currently available
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computers. Users are encouraged to modify this subroutine to set
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the tuning parameters for their particular machine using the option
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and problem size information in the arguments.
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Arguments
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=========
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ISPEC (input) int
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Specifies the parameter to be returned as the value of SP_IENV.
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= 1: the panel size w; a panel consists of w consecutive
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columns of matrix A in the process of Gaussian elimination.
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The best value depends on machine's cache characters.
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= 2: the relaxation parameter relax; if the number of
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nodes (columns) in a subtree of the elimination tree is less
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than relax, this subtree is considered as one supernode,
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regardless of their row structures.
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= 3: the maximum size for a supernode in complete LU;
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= 4: the minimum row dimension for 2-D blocking to be used;
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= 5: the minimum column dimension for 2-D blocking to be used;
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= 6: the estimated fills factor for L and U, compared with A;
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= 7: the maximum size for a supernode in ILU.
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(SP_IENV) (output) int
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>= 0: the value of the parameter specified by ISPEC
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< 0: if SP_IENV = -k, the k-th argument had an illegal value.
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=====================================================================
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<address style="text-align: right;"><small>Generated on Mon Nov 22 10:23:48 2010 for SuperLU by </small></address>
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 1.5.5
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