Hi all, On petsc3.12, I successfully run the linear solver mkl cpardiso on parallel environment.  However, with the exactly same code, petsc-3.16 halt [0] PCSetUp(): Setting up PC for first time ---------------------------------------- MKL_CPARDISO Options:   -mat_mkl_cpardiso_65 <now 0 : formerly 0>: Suggested number of threads to use within MKL_CPARDISO (None)   -mat_mkl_cpardiso_66 <now 1 : formerly 1>: Maximum number of factors with identical sparsity structure that must be kept in memory at the same time (None)   -mat_mkl_cpardiso_67 <now 1 : formerly 1>: Indicates the actual matrix for the solution phase (None)   -mat_mkl_cpardiso_68 <now 0 : formerly 0>: Message level information (None)   -mat_mkl_cpardiso_69 <now 11 : formerly 11>: Defines the matrix type (None)   -mat_mkl_cpardiso_1 <now 1 : formerly 1>: Use default values (None) <--------- halt here Regards Gong Ding