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Belos CG: Caching of state vectors #13751
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If the intent is to cache the state, is there a reason why the state generated by any iteration object could not be stored in the solver manager with getState() and reused? Consolidating all the logic for creating a state object that is the union of all CG variants seems a bit overcomplicated. |
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@hkthorn I can totally consolidate it and move it to the solver manager and remove the state struct. That seems like a nice solution. |
@cgcgcg It feels simpler for the each solver manager to save the state structure generated by the specific iteration class it is calling for future solves because it will be well aware of changes that require the construction of a new state. However, it might be worth having a conversation about my proposal, so that I make sure it addresses your goal and use cases. |
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@cgcgcg Thanks for the discussion. I hope to review the changes today. :) |
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@cgcgcg I'm confused by the initialize functions using "numRHS" because "blocksize" is more tied to the allocation of the working vectors in the solvers than "numRHS". The block and pseudo block iterations will solve chunks of the linear systems if "numRHS" > "blocksize".
Teuchos::RCP<const MV> tmp = ( (rhsMV!=Teuchos::null)? rhsMV: lhsMV ); | ||
TEUCHOS_ASSERT(!newstate.is_null()); | ||
if (!Teuchos::rcp_dynamic_cast<BlockCGIterationState<ScalarType,MV> >(newstate, true)->matches(tmp, blockSize_)) | ||
newstate->initialize(tmp, blockSize_); |
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@hkthorn It's getting called using blockSize_
. The argument numRHS
in BlockCGIterationState::initialize()
is a leftover from the refactor. In order to be consistent, I could just rename numRHS
to numVectors
in all the iteration states.
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I think that would avoid confusion in the future, if you don't mind.
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LGTM
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@trilinos/belos
Motivation
Before this change the CG variants set only the initial residual vector from the problem in the
CGIterationState
structure.The
Z
,P
andAP
member variables were not set. All auxiliary vectors were reallocated on every solve in theCGIteration
class.With this change, all auxiliary vectors are members of the state and are reused or reallocated on subsequent solves.