[PDF][PDF] Domain Decomposition Solver Status and Future Plans.
RG Coleman, CR Dohrmann - 2017 - osti.gov
2017•osti.gov
▪+ Fewer subdomains often leads to better DD convergence▪+ Fewer coarse levels can have
convergence/comm benefit▪+ Less memory & communication needed for MPI▪-Less isolation
from NUMA & shared memory effects▪-More work at subdomain level (order N2 flops for
3D)*▪-More memory at subdomain level (order N4/3 for 3D)*
convergence/comm benefit▪+ Less memory & communication needed for MPI▪-Less isolation
from NUMA & shared memory effects▪-More work at subdomain level (order N2 flops for
3D)*▪-More memory at subdomain level (order N4/3 for 3D)*
▪+ Fewer subdomains often leads to better DD convergence▪+ Fewer coarse levels can have convergence/comm benefit▪+ Less memory & communication needed for MPI▪-Less isolation from NUMA & shared memory effects▪-More work at subdomain level (order N2 flops for 3D)*▪-More memory at subdomain level (order N4/3 for 3D)*
osti.gov
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