[petsc-dev] Pipelined CG

[Jed Brown]

I just merged several pipelined conjugate gradient methods from Pieter
Ghysels. If you are interested, here's the paper.

http://www.exascience.com/wp-content/uploads/2012/12/Ghysels_12.2012.1.pdf

Access the methods with -ksp_type <pipecg,groppcg,pipecr>
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