petsc-3.11.4 2019-09-28
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KSPPIPELCG

 Deep pipelined (length l) Conjugate Gradient method. This method has only a single non-blocking global reduction per iteration, compared to 2 blocking reductions for standard CG. The reduction is overlapped by the matrix-vector product and preconditioner application of the next l iterations. The pipeline length l is a parameter of the method.

Options Database Keys

see KSPSolve() -

Notes

MPI configuration may be necessary for reductions to make asynchronous progress, which is important for performance of pipelined methods. See the FAQ on the PETSc website for details.

Contributed by

Siegfried Cools, University of Antwerp, Dept. Mathematics and Computer Science, funded by Flemish Research Foundation (FWO) grant number 12H4617N.

Reference

J. Cornelis, S. Cools and W. Vanroose, "The Communication-Hiding Conjugate Gradient Method with Deep Pipelines", Submitted to SIAM Journal on Scientific Computing (SISC), 2018.

See Also

KSPCreate(), KSPSetType(), KSPType (for list of available types), KSPCG, KSPPIPECG, KSPPIPECGRR, KSPPGMRES,
KSPPIPEBCGS, KSPSetPCSide()

Level

intermediate

Location

src/ksp/ksp/impls/cg/pipelcg/pipelcg.c
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages