4f1c674ee0
http://crd.lbl.gov/~xiaoye/SuperLU/ This is a library to solve sparse matrix systems (type A*x=B). It is able to solve large systems very FAST. Only the necessary parts of the library are included to limit file size and compilation time. This means the example files, fortran interface, test files, matlab interface, cblas library, complex number part and build system have been left out. All (gcc) warnings have been fixed too. This library will be used for LSCM UV unwrapping. With this library, LSCM unwrapping can be calculated in a split second, making the unwrapping proces much more interactive. Added OpenNL (Open Numerical Libary): http://www.loria.fr/~levy/OpenNL/ OpenNL is a library to easily construct and solve sparse linear systems. We use a stripped down version, as an interface to SuperLU. This library was kindly given to use by Bruno Levy.
66 lines
2.0 KiB
C
66 lines
2.0 KiB
C
/*
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* File name: sp_ienv.c
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* History: Modified from lapack routine ILAENV
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*/
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#include "ssp_defs.h"
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#include "util.h"
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int
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sp_ienv(int ispec)
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{
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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;
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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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(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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*/
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int i;
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switch (ispec) {
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case 1: return (10);
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case 2: return (5);
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case 3: return (100);
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case 4: return (200);
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case 5: return (40);
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case 6: return (20);
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}
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/* Invalid value for ISPEC */
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i = 1;
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xerbla_("sp_ienv", &i);
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return 0;
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} /* sp_ienv_ */
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