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- Storing method for the coefficient matrix for the Preconditioned GMRES

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elmeliegy__abdelrahm

Beginner

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08-30-2018
09:57 AM

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Storing method for the coefficient matrix for the Preconditioned GMRES

Hi All;

Quick Question; How can i use GMRES for a preconditioned very large linear system without storing the entire coefficient matrix?. As i understand; GMRES asks for the RHS vector, the entire coefficient matrix and the Preconditioner. But for the memory limitation and for the compuational cost i will not be able to assemble and store the entire coefficient matrix. Any thought is very appreciated!.

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Ying_H_Intel

Employee

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08-30-2018
11:31 PM

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Hi

it seems the MKL GEMRES only support put entire matrix into computing. what is the size for the entire coefficient matrix and your memory? MKL have one parallel sparse solver at https://software.intel.com/en-us/articles/intel-math-kernel-library-parallel-direct-sparse-solver-fo... , which may have distribute requirement about the memory.

Best Regards,

Ying

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