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Thyra_SpmdVectorSpaceUtilities.cpp
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4// Thyra: Interfaces and Support for Abstract Numerical Algorithms
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41
42#include "Thyra_SpmdVectorSpaceUtilities.hpp"
43#include "Teuchos_CommHelpers.hpp"
44
45
46namespace Thyra {
47
48
49Ordinal SpmdVectorSpaceUtilities::computeMapCode(
50 const Teuchos::Comm<Ordinal> &comm, const Ordinal localSubDim
51 )
52{
53 using Teuchos::outArg;
54 using Teuchos::REDUCE_SUM;
55 using Teuchos::reduceAll;
56 //
57 // Here we will make a map code out of just the local sub-dimension on each
58 // processor. If each processor has the same number of local elements, then
59 // the map codes will be the same and this is all you need for RTOp
60 // compatibility.
61 //
62 const int procRank = comm.getSize ();
63 Ordinal mapCode = -1;
64 Ordinal localCode = localSubDim % (procRank+1) + localSubDim;
65 reduceAll<Ordinal, Ordinal> (comm, REDUCE_SUM, localCode, outArg (mapCode));
66 return mapCode;
67}
68
69
70Ordinal SpmdVectorSpaceUtilities::computeLocalOffset(
71 const Teuchos::Comm<Ordinal> &comm, const Ordinal localSubDim
72 )
73{
74 using Teuchos::outArg;
75 using Teuchos::REDUCE_SUM;
76 using Teuchos::scan;
77
78 Ordinal localOffset;
79 const Ordinal _localOffset = localSubDim;
80 scan<Ordinal, Ordinal> (comm, REDUCE_SUM, _localOffset, outArg (localOffset));
81 localOffset -= localSubDim;
82 return localOffset;
83}
84
85
86Ordinal SpmdVectorSpaceUtilities::computeGlobalDim(
87 const Teuchos::Comm<Ordinal> &comm, const Ordinal localSubDim
88 )
89{
90 using Teuchos::outArg;
91 using Teuchos::REDUCE_SUM;
92 using Teuchos::reduceAll;
93
94 Ordinal globalDim = -1;
95 reduceAll<Ordinal, Ordinal> (comm, REDUCE_SUM, localSubDim, outArg (globalDim));
96 return globalDim;
97}
98
99
100} // namespace Thyra
virtual int getSize() const=0
Teuchos::Ordinal Ordinal
Type for the dimension of a vector space. `*.