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spfmex_utils

• OfactOptim

Purpose

OfactOptim

This command can be used to set spfmex parameters in order to optimize computation speed for factorization and / or solving.

spfmex_utils('OfactOptim',ki,RO,ofact(1,'lu'));
ki is the matrix that is used for the optimization. RO is a data structure defining options with following fields:

• .nCompt Number of computation for result averaging.
• .maxDomain Max size of blocks of the elimination tree (fraction of matrix size).
• .maxZeros Max number of zeros in the blocks of the resolution tree (fraction of matrix size).
• .refineStep Number of step to refine the optimal parameter pair found in the first step. Command option -refine must be added to perform the refine step.

The last argument ofact(1,'lu') is needed in order to call directly spfmex_utils.

Available command options are

• -setopt use default RO.
• -refine performs refine step for optimal search.
• fact to benchmark factorization step.
• solve to benchmark resolution step.
• -plot to plot history in iiplot

Following example optimize only solving:

ki=rand(20);
RO=struct('nCompt',100,... number of computation for result averaging
          'maxDomain',2.^[4:7],... parameter 1
          'maxZeros',logspace(-3,1,5),... parameter 2
          'refineStep',3); % refine results to most relevant parameters
spfmex_utils('ofactoptim solve-refine',ki,RO,ofact(1,'lu')); % method,solve,fact,-setopt,refine,