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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Hi All,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I am using the Intel MKL CPardiso library as a PC direct solver, and I am trying to figure out how to properly set options (the Pardiso and CPardiso “iparm” parameter values in the Intel docs).<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Q1: To set the Pivoting perturbation, for example, is the correct call:<o:p></o:p></p><p class=MsoNormal>ierr = MatMkl_CPardisoSetCntl( K, 10, 13 );<o:p></o:p></p><p class=MsoNormal>where the KSP matrix to be inverted is “K” and the value that I want is “13”? This is the “-mat_mkl_pardiso_10” option listed on the MATSOLVERMKL_PARDISO page, and the “iparm[9]” option in the Intel docs.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Q2: Where do I make this call, before “MatSetUp( K )”, at some point during the creation and setup of KSP, or after calling “PCFactorSetMatSolverPackage( pc, MATSOLVERMKL_CPARDISO )”? I’ve tried many different combinations and none of them seem to work.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Since the effect of changing the pivoting perturbation may not be obvious, I also tried setting the number of OpenMP threads to use within Pardiso (icntl = 65, without the environmental variable MKL_NUM_THREADS present) and my setting was ignored (Pardiso defaulted to using the maximum number of cores present).<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks in advance,<o:p></o:p></p><p class=MsoNormal>Matt Overholt<o:p></o:p></p></div><br />
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