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Incomplete factorization...

Kim__Kyungjoo
Beginner
‎07-06-2015 05:02 PM
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Hello,

I am testing MKL ilu factorization. As it only works for ilu0, I provide a sparse matrix pattern that corresponds to ilu(k). One thing I observe is that the performance is getting slower when I increase the level of fills (I have compared with matlab for comparison). Is this expected ?

For instance, I have the following results from mkl.

level0, nnz = 9,027,150, time = 0.598093, matlab = 0.766352 

level1, nnz = 12,816,050, time = 1.3787, matlab = 1.31876

level2, nnz = 15,450,825, time = 2.57172, matlab = 1.9329

This seems to be odd. Does mkl perform something special ? any pivoting ? or more specialized for sparser patterns ?  

 

Thanks,

Kyungjoo

 

 

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