SStruct matvec copy to/from parcsr - #1578
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…and global rank. Also add user API for setting arbitrary data in sstruct matrix in a big array.
…ft of implementation. This is not yet tested.
… for doing the copying during matvec. Added code to get the ranks/indexes to copy back and forth. Still need to implement the actual copy.
…ec strategy on/off
…xes to global ranks.
…es() so that I can remove HYPRE_SStructVectorGather() and directly access the correct values
…o make incremental progress here and have all the data in the right place.
…mplementation of IndexesToGlobalRanks for now.
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This modifies the way we do the sstruct matvec. In this version, we do a copy between the relevant sstruct vectors and temporary par vectors to perform the parcsr component of the matvec. This relaxes the previous requirement that the sstruct vector's underlying data layout be a single contiguous block corresponding to the data for the par vectors used in the parcsr matvec. This will be important if we want to be able to avoid resizing/restoring the underlying struct vectors for each matvec.