Raju Ram

"Hybrid Parallel Preconditioners in Domain Decomposition Methods: Achieving Robustness and Scalability in the Solution of Large-Scale Linear Systems"

Krylov subspace solvers like GMRES and preconditioners such as ILU are widely used for solving large-scale linear systems in simulations. Scalable parallel implementations are required to exploit the increasing parallelism provided by modern hardware. We develop a hybrid parallel Crout ILU preconditioner within the linear solver library GaspiLS, leveraging the GASPI programming model. At the process level, domain decomposition methods such as additive Schwarz (AS) and restricted additive Schwarz (RAS) are employed, and the multilevel nested dissection method is applied at the thread level.

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