KSPPIPECR#

Pipelined conjugate residual method This method has only a single non-blocking reduction per iteration, compared to 2 blocking for standard CR. The non-blocking reduction is overlapped by the matrix-vector product, but not the preconditioner application.

See also KSPPIPECG, where the reduction is only overlapped with the matrix-vector product.

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#

Pieter Ghysels, Universiteit Antwerpen, Intel Exascience lab Flanders

Reference#

P. Ghysels and W. Vanroose, “Hiding global synchronization latency in the preconditioned Conjugate Gradient algorithm”, Submitted to Parallel Computing, 2012.

See Also#

KSPCreate(), KSPSetType(), KSPPIPECG, KSPGROPPCG, KSPPGMRES, KSPCG, KSPCGUseSingleReduction()

Level#

intermediate

Location#

src/ksp/ksp/impls/cr/pipecr/pipecr.c


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Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages