Thyra_SpmdMultiVectorBase.hpp

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// ***********************************************************************
// 
//    Thyra: Interfaces and Support for Abstract Numerical Algorithms
//                 Copyright (2004) Sandia Corporation
// 
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
// 
// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
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// This library is distributed in the hope that it will be useful, but
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//  
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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// Questions? Contact Michael A. Heroux (maherou@sandia.gov)
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// @HEADER

#ifndef THYRA_SPMD_MULTI_VECTOR_BASE_HPP
#define THYRA_SPMD_MULTI_VECTOR_BASE_HPP

#include "Thyra_SpmdMultiVectorBaseDecl.hpp"
#include "Thyra_MultiVectorDefaultBase.hpp"
#include "Thyra_SingleScalarEuclideanLinearOpBase.hpp"
#include "Thyra_SpmdVectorSpaceDefaultBase.hpp"
#include "Thyra_DetachedMultiVectorView.hpp"
#include "RTOpPack_SPMD_apply_op.hpp"
#include "RTOp_parallel_helpers.h"
#include "Teuchos_Workspace.hpp"
#include "Teuchos_dyn_cast.hpp"
#include "Teuchos_Time.hpp"
#include "Teuchos_CommHelpers.hpp"

// Define to see some timing output!
//#define THYRA_SPMD_MULTI_VECTOR_BASE_PRINT_TIMES

namespace Thyra {

template<class Scalar>
SpmdMultiVectorBase<Scalar>::SpmdMultiVectorBase()
  :in_applyOp_(false)
  ,globalDim_(0)
  ,localOffset_(-1)
  ,localSubDim_(0)
  ,numCols_(0)
{}

// Overridden from EuclideanLinearOpBase

template<class Scalar>
Teuchos::RefCountPtr< const ScalarProdVectorSpaceBase<Scalar> >
SpmdMultiVectorBase<Scalar>::rangeScalarProdVecSpc() const
{
  return Teuchos::rcp_dynamic_cast<const ScalarProdVectorSpaceBase<Scalar> >(
    spmdSpace(),true
    );
}

// Overridden from LinearOpBase

template<class Scalar>
void SpmdMultiVectorBase<Scalar>::apply(
  const ETransp                     M_trans
  ,const MultiVectorBase<Scalar>    &X
  ,MultiVectorBase<Scalar>          *Y
  ,const Scalar                     alpha
  ,const Scalar                     beta
  ) const
{
  this->single_scalar_euclidean_apply_impl(M_trans,X,Y,alpha,beta);
}

// Overridden from MultiVectorBase

template<class Scalar>
void SpmdMultiVectorBase<Scalar>::applyOp(
  const RTOpPack::RTOpT<Scalar>         &pri_op
  ,const int                            num_multi_vecs
  ,const MultiVectorBase<Scalar>*const  multi_vecs[]
  ,const int                            num_targ_multi_vecs
  ,MultiVectorBase<Scalar>*const        targ_multi_vecs[]
  ,RTOpPack::ReductTarget*const         reduct_objs[]
  ,const Index                          pri_first_ele_offset_in
  ,const Index                          pri_sub_dim_in
  ,const Index                          pri_global_offset_in
  ,const Index                          sec_first_ele_offset_in
  ,const Index                          sec_sub_dim_in
  ) const
{
  using Teuchos::dyn_cast;
  using Teuchos::Workspace;
  Teuchos::WorkspaceStore* wss = Teuchos::get_default_workspace_store().get();
  const Index numCols = this->domain()->dim();
  const SpmdVectorSpaceBase<Scalar> &spmdSpc = *spmdSpace();
#ifdef TEUCHOS_DEBUG
  TEST_FOR_EXCEPTION(
    in_applyOp_, std::invalid_argument
    ,"SpmdMultiVectorBase<>::applyOp(...): Error, this method is being entered recursively which is a "
    "clear sign that one of the methods acquireDetachedView(...), releaseDetachedView(...) or commitDetachedView(...) "
    "was not implemented properly!"
    );
  apply_op_validate_input(
    "SpmdMultiVectorBase<>::applyOp(...)", *this->domain(), *this->range()
    ,pri_op,num_multi_vecs,multi_vecs,num_targ_multi_vecs,targ_multi_vecs
    ,reduct_objs,pri_first_ele_offset_in,pri_sub_dim_in,pri_global_offset_in
    ,sec_first_ele_offset_in,sec_sub_dim_in
    );
#endif
  // Flag that we are in applyOp()
  in_applyOp_ = true;
  // First see if this is a locally replicated vector in which case
  // we treat this as a local operation only.
  const bool locallyReplicated = (localSubDim_ == globalDim_);
  // Get the overlap in the current process with the input logical sub-vector
  // from (first_ele_offset_in,sub_dim_in,global_offset_in)
  Teuchos_Index  overlap_first_local_ele_off  = 0;
  Teuchos_Index  overlap_local_sub_dim        = 0;
  Teuchos_Index  overlap_global_offset        = 0;
  RTOp_parallel_calc_overlap(
    globalDim_, localSubDim_, localOffset_, pri_first_ele_offset_in, pri_sub_dim_in, pri_global_offset_in
    ,&overlap_first_local_ele_off, &overlap_local_sub_dim, &overlap_global_offset
    );
  const Range1D
    local_rng = (
      overlap_first_local_ele_off>=0
      ? Range1D( localOffset_+overlap_first_local_ele_off, localOffset_+overlap_first_local_ele_off+overlap_local_sub_dim-1 )
      : Range1D::Invalid
      ),
    col_rng(
      sec_first_ele_offset_in
      ,sec_sub_dim_in >= 0 ? sec_first_ele_offset_in+sec_sub_dim_in-1 : numCols-1
      );
  // Create sub-vector views of all of the *participating* local data
  Workspace<RTOpPack::ConstSubMultiVectorView<Scalar> > sub_multi_vecs(wss,num_multi_vecs);
  Workspace<RTOpPack::SubMultiVectorView<Scalar> > targ_sub_multi_vecs(wss,num_targ_multi_vecs);
  if( overlap_first_local_ele_off >= 0 ) {
    for(int k = 0; k < num_multi_vecs; ++k ) {
      multi_vecs[k]->acquireDetachedView( local_rng, col_rng, &sub_multi_vecs[k] );
      sub_multi_vecs[k].setGlobalOffset( overlap_global_offset );
    }
    for(int k = 0; k < num_targ_multi_vecs; ++k ) {
      targ_multi_vecs[k]->acquireDetachedView( local_rng, col_rng, &targ_sub_multi_vecs[k] );
      targ_sub_multi_vecs[k].setGlobalOffset( overlap_global_offset );
    }
  }
  // Apply the RTOp operator object (all processors must participate)
  RTOpPack::SPMD_apply_op(
    locallyReplicated ? NULL : spmdSpc.getComm().get()                                 // comm
    ,pri_op                                                                            // op
    ,col_rng.size()                                                                    // num_cols
    ,num_multi_vecs                                                                    // num_multi_vecs
    ,num_multi_vecs && overlap_first_local_ele_off>=0 ? &sub_multi_vecs[0] : NULL      // sub_multi_vecs
    ,num_targ_multi_vecs                                                               // num_targ_multi_vecs
    ,num_targ_multi_vecs && overlap_first_local_ele_off>=0 ? &targ_sub_multi_vecs[0] : NULL// targ_sub_multi_vecs
    ,reduct_objs                                                                       // reduct_objs
    );
  // Free and commit the local data
  if( overlap_first_local_ele_off >= 0 ) {
    for(int k = 0; k < num_multi_vecs; ++k ) {
      sub_multi_vecs[k].setGlobalOffset(local_rng.lbound());
      multi_vecs[k]->releaseDetachedView( &sub_multi_vecs[k] );
    }
    for(int k = 0; k < num_targ_multi_vecs; ++k ) {
      targ_sub_multi_vecs[k].setGlobalOffset(local_rng.lbound());
      targ_multi_vecs[k]->commitDetachedView( &targ_sub_multi_vecs[k] );
    }
  }
  // Flag that we are leaving applyOp()
  in_applyOp_ = false;
}

template<class Scalar>
void SpmdMultiVectorBase<Scalar>::acquireDetachedView(
  const Range1D                       &rowRng_in
  ,const Range1D                      &colRng_in
  ,RTOpPack::ConstSubMultiVectorView<Scalar>  *sub_mv
  ) const
{
  const Range1D rowRng = validateRowRange(rowRng_in);
  const Range1D colRng = validateColRange(colRng_in);
  if( rowRng.lbound() < localOffset_ || localOffset_+localSubDim_-1 < rowRng.ubound() ) {
    // rng consists of off-processor elements so use the default implementation!
    MultiVectorDefaultBase<Scalar>::acquireDetachedView(rowRng_in,colRng_in,sub_mv);
    return;
  }
  // rng consists of all local data so get it!
  const Scalar *localValues = NULL;
  int leadingDim = 0;
  this->getLocalData(&localValues,&leadingDim);
  sub_mv->initialize(
    rowRng.lbound()                               // globalOffset
    ,rowRng.size()                                // subDim
    ,colRng.lbound()                              // colOffset
    ,colRng.size()                                // numSubCols
    ,localValues
    +(rowRng.lbound()-localOffset_)
    +colRng.lbound()*leadingDim                   // values
    ,leadingDim                                   // leadingDim
    );
}

template<class Scalar>
void SpmdMultiVectorBase<Scalar>::releaseDetachedView(
  RTOpPack::ConstSubMultiVectorView<Scalar>* sub_mv
  ) const
{
  if( sub_mv->globalOffset() < localOffset_ || localOffset_+localSubDim_ < sub_mv->globalOffset()+sub_mv->subDim() ) {
    // Let the default implementation handle it!
    MultiVectorDefaultBase<Scalar>::releaseDetachedView(sub_mv);
    return;
  }
  freeLocalData( sub_mv->values() );
  sub_mv->set_uninitialized();
}

template<class Scalar>
void SpmdMultiVectorBase<Scalar>::acquireDetachedView(
  const Range1D                                &rowRng_in
  ,const Range1D                               &colRng_in
  ,RTOpPack::SubMultiVectorView<Scalar>    *sub_mv
  )
{
  const Range1D rowRng = validateRowRange(rowRng_in);
  const Range1D colRng = validateColRange(colRng_in);
  if( rowRng.lbound() < localOffset_ || localOffset_+localSubDim_-1 < rowRng.ubound() ) {
    // rng consists of off-processor elements so use the default implementation!
    MultiVectorDefaultBase<Scalar>::acquireDetachedView(rowRng_in,colRng_in,sub_mv);
    return;
  }
  // rng consists of all local data so get it!
  Scalar *localValues = NULL;
  int leadingDim = 0;
  this->getLocalData(&localValues,&leadingDim);
  sub_mv->initialize(
    rowRng.lbound()                               // globalOffset
    ,rowRng.size()                                // subDim
    ,colRng.lbound()                              // colOffset
    ,colRng.size()                                // numSubCols
    ,localValues
    +(rowRng.lbound()-localOffset_)
    +colRng.lbound()*leadingDim                   // values
    ,leadingDim                                   // leadingDim
    );
}

template<class Scalar>
void SpmdMultiVectorBase<Scalar>::commitDetachedView(
  RTOpPack::SubMultiVectorView<Scalar>* sub_mv
  )
{
  if( sub_mv->globalOffset() < localOffset_ || localOffset_+localSubDim_ < sub_mv->globalOffset()+sub_mv->subDim() ) {
    // Let the default implementation handle it!
    MultiVectorDefaultBase<Scalar>::commitDetachedView(sub_mv);
    return;
  }
  commitLocalData( sub_mv->values() );
  sub_mv->set_uninitialized();
}

// protected

template<class Scalar>
void SpmdMultiVectorBase<Scalar>::euclideanApply(
  const ETransp                     M_trans
  ,const MultiVectorBase<Scalar>    &X
  ,MultiVectorBase<Scalar>          *Y
  ,const Scalar                     alpha
  ,const Scalar                     beta
  ) const
{
  typedef Teuchos::ScalarTraits<Scalar> ST;
  using Teuchos::Workspace;
  Teuchos::WorkspaceStore* wss = Teuchos::get_default_workspace_store().get();

#ifdef THYRA_SPMD_MULTI_VECTOR_BASE_PRINT_TIMES
  Teuchos::Time timerTotal("dummy",true);
  Teuchos::Time timer("dummy");
#endif

  //
  // This function performs one of two operations.
  //
  // The first operation (M_trans == NOTRANS) is:
  //
  //     Y = beta * Y + alpha * M * X
  //
  // where Y and M have compatible (distributed?) range vector
  // spaces and X is a locally replicated serial multi-vector.  This
  // operation does not require any global communication.
  //
  // The second operation (M_trans == TRANS) is:
  //
  //     Y = beta * Y + alpha * M' * X
  //
  // where M and X have compatible (distributed?) range vector spaces
  // and Y is a locally replicated serial multi-vector.  This operation
  // requires a local reduction.
  //

  //
  // Get spaces and validate compatibility
  //

  // Get the SpmdVectorSpace
  const SpmdVectorSpaceBase<Scalar> &spmdSpc = *this->spmdSpace();

  // Get the Spmd communicator
  const Teuchos::RefCountPtr<const Teuchos::Comm<Index> >
    comm = spmdSpc.getComm();
#ifdef TEUCHOS_DEBUG
  const VectorSpaceBase<Scalar>
    &Y_range = *Y->range(),
    &X_range = *X.range();
//  std::cout << "SpmdMultiVectorBase<Scalar>::apply(...): comm = " << comm << std::endl;
  TEST_FOR_EXCEPTION(
    ( globalDim_ > localSubDim_ ) && comm.get()==NULL, std::logic_error
    ,"SpmdMultiVectorBase<Scalar>::apply(...MultiVectorBase<Scalar>...): Error!"
    );
  // ToDo: Write a good general validation function that I can call that will replace
  // all of these TEST_FOR_EXCEPTION(...) uses

  TEST_FOR_EXCEPTION(
    real_trans(M_trans)==NOTRANS && !spmdSpc.isCompatible(Y_range), Exceptions::IncompatibleVectorSpaces
    ,"SpmdMultiVectorBase<Scalar>::apply(...MultiVectorBase<Scalar>...): Error!"
    );
  TEST_FOR_EXCEPTION(
    real_trans(M_trans)==TRANS && !spmdSpc.isCompatible(X_range), Exceptions::IncompatibleVectorSpaces
    ,"SpmdMultiVectorBase<Scalar>::apply(...MultiVectorBase<Scalar>...): Error!"
    );
#endif

  //
  // Get explicit (local) views of Y, M and X
  //

#ifdef THYRA_SPMD_MULTI_VECTOR_BASE_PRINT_TIMES
  timer.start();
#endif
    
  DetachedMultiVectorView<Scalar>
    Y_local(
      *Y
      ,real_trans(M_trans)==NOTRANS ? Range1D(localOffset_,localOffset_+localSubDim_-1) : Range1D()
      ,Range1D()
      );
  ConstDetachedMultiVectorView<Scalar>
    M_local(
      *this
      ,Range1D(localOffset_,localOffset_+localSubDim_-1)
      ,Range1D()
      );
  ConstDetachedMultiVectorView<Scalar>
    X_local(
      X
      ,real_trans(M_trans)==NOTRANS ? Range1D() : Range1D(localOffset_,localOffset_+localSubDim_-1)
      ,Range1D()
      );
#ifdef THYRA_SPMD_MULTI_VECTOR_BASE_PRINT_TIMES
  timer.stop();
  std::cout << "\nSpmdMultiVectorBase<Scalar>::apply(...): Time for getting view = " << timer.totalElapsedTime() << " seconds\n";
#endif
#ifdef TEUCHOS_DEBUG    
  TEST_FOR_EXCEPTION(
    real_trans(M_trans)==NOTRANS && ( M_local.numSubCols() != X_local.subDim() || X_local.numSubCols() != Y_local.numSubCols() )
    , Exceptions::IncompatibleVectorSpaces
    ,"SpmdMultiVectorBase<Scalar>::apply(...MultiVectorBase<Scalar>...): Error!"
    );
  TEST_FOR_EXCEPTION(
    real_trans(M_trans)==TRANS && ( M_local.subDim() != X_local.subDim() || X_local.numSubCols() != Y_local.numSubCols() )
    , Exceptions::IncompatibleVectorSpaces
    ,"SpmdMultiVectorBase<Scalar>::apply(...MultiVectorBase<Scalar>...): Error!"
    );
#endif

  //
  // If nonlocal (i.e. M_trans==TRANS) then create temporary storage
  // for:
  //
  //     Y_local_tmp = alpha * M(local) * X(local)                 : on nonroot processes
  //
  // or
  //
  //     Y_local_tmp = beta*Y_local + alpha * M(local) * X(local)  : on root process (localOffset_==0)
  // 
  // and set
  //
  //     localBeta = ( localOffset_ == 0 ? beta : 0.0 )
  //
  // Above, we choose localBeta such that we will only perform
  // Y_local = beta * Y_local + ...  on one process (the root
  // process where localOffset_==0x).  Then, when we add up Y_local
  // on all of the processors and we will get the correct result.
  //
  // If strictly local (i.e. M_trans == NOTRANS) then set:
  //
  //      Y_local_tmp = Y_local
  //      localBeta = beta
  //

#ifdef THYRA_SPMD_MULTI_VECTOR_BASE_PRINT_TIMES
  timer.start();
#endif
    
  Workspace<Scalar> Y_local_tmp_store(wss,Y_local.subDim()*Y_local.numSubCols(),false);
  RTOpPack::SubMultiVectorView<Scalar> Y_local_tmp;
  Scalar localBeta;
  if( real_trans(M_trans) == TRANS && globalDim_ > localSubDim_ ) {
    // Nonlocal
    Y_local_tmp.initialize(
      0, Y_local.subDim()
      ,0, Y_local.numSubCols()
      ,&Y_local_tmp_store[0], Y_local.subDim() // leadingDim == subDim (columns are adjacent)
      );
    if( localOffset_ == 0 ) {
      // Root process: Must copy Y_local into Y_local_tmp
      for( int j = 0; j < Y_local.numSubCols(); ++j ) {
        Scalar *Y_local_j = Y_local.values() + Y_local.leadingDim()*j;
        std::copy( Y_local_j, Y_local_j + Y_local.subDim(), Y_local_tmp.values() + Y_local_tmp.leadingDim()*j );
      }
      localBeta = beta;
    }
    else {
      // Not the root process
      localBeta = 0.0;
    }
  }
  else {
    // Local
    Y_local_tmp = Y_local.smv(); // Shallow copy only!
    localBeta = beta;
  }

#ifdef THYRA_SPMD_MULTI_VECTOR_BASE_PRINT_TIMES
  timer.stop();
  std::cout << "\nSpmdMultiVectorBase<Scalar>::apply(...): Time for setting up Y_local_tmp and localBeta = " << timer.totalElapsedTime() << " seconds\n";
#endif
    
  //
  // Perform the local multiplication:
  //
  //     Y(local) = localBeta * Y(local) + alpha * op(M(local)) * X(local)
  //
  // or in BLAS lingo:
  //
  //     C        = beta      * C        + alpha * op(A)        * op(B)
  //

#ifdef THYRA_SPMD_MULTI_VECTOR_BASE_PRINT_TIMES
  timer.start();
#endif
  Teuchos::ETransp t_transp;
  if(ST::isComplex) {
    switch(M_trans) {
      case NOTRANS:   t_transp = Teuchos::NO_TRANS;     break;
      case TRANS:     t_transp = Teuchos::TRANS;        break;
      case CONJTRANS: t_transp = Teuchos::CONJ_TRANS;   break;
      default: TEST_FOR_EXCEPT(true);
    }
  }
  else {
    switch(real_trans(M_trans)) {
      case NOTRANS:   t_transp = Teuchos::NO_TRANS;     break;
      case TRANS:     t_transp = Teuchos::TRANS;        break;
      default: TEST_FOR_EXCEPT(true);
    }
  }
  blas_.GEMM(
    t_transp                                                                  // TRANSA
    ,Teuchos::NO_TRANS                                                        // TRANSB
    ,Y_local.subDim()                                                         // M
    ,Y_local.numSubCols()                                                     // N
    ,real_trans(M_trans)==NOTRANS ? M_local.numSubCols() : M_local.subDim()   // K
    ,alpha                                                                    // ALPHA
    ,const_cast<Scalar*>(M_local.values())                                    // A
    ,M_local.leadingDim()                                                     // LDA
    ,const_cast<Scalar*>(X_local.values())                                    // B
    ,X_local.leadingDim()                                                     // LDB
    ,localBeta                                                                // BETA
    ,Y_local_tmp.values()                                                     // C
    ,Y_local_tmp.leadingDim()                                                 // LDC
    );
#ifdef THYRA_SPMD_MULTI_VECTOR_BASE_PRINT_TIMES
  timer.stop();
  std::cout
    << "\nSpmdMultiVectorBase<Scalar>::apply(...): Time for GEMM = "
    << timer.totalElapsedTime() << " seconds\n";
#endif

  if( comm.get() ) {
    
    //
    // Perform the global reduction of Y_local_tmp back into Y_local
    //
    
    if( real_trans(M_trans)==TRANS && globalDim_ > localSubDim_ ) {
      // Contiguous buffer for final reduction
      Workspace<Scalar> Y_local_final_buff(wss,Y_local.subDim()*Y_local.numSubCols(),false);
      // Perform the reduction
      Teuchos::reduceAll<Index,Scalar>(
        *comm,Teuchos::REDUCE_SUM,Y_local_final_buff.size(),Y_local_tmp.values()
        ,&Y_local_final_buff[0]
        );
      // Load Y_local_final_buff back into Y_local
      const Scalar *Y_local_final_buff_ptr = &Y_local_final_buff[0];
      for( int j = 0; j < Y_local.numSubCols(); ++j ) {
        Scalar *Y_local_ptr = Y_local.values() + Y_local.leadingDim()*j;
        for( int i = 0; i < Y_local.subDim(); ++i ) {
          (*Y_local_ptr++) = (*Y_local_final_buff_ptr++);
        }
      }
    }
  }
  else {

    // When you get here the view Y_local will be committed back to Y
    // in the destructor to Y_local

  }

#ifdef THYRA_SPMD_MULTI_VECTOR_BASE_PRINT_TIMES
  timer.stop();
  std::cout 
    << "\nSpmdMultiVectorBase<Scalar>::apply(...): Total time = "
    << timerTotal.totalElapsedTime() << " seconds\n";
#endif

}

// Overridden from SingleScalarEuclideanLinearOpBase

template<class Scalar>
bool SpmdMultiVectorBase<Scalar>::opSupported(ETransp M_trans) const
{
  typedef Teuchos::ScalarTraits<Scalar> ST;
  return ( ST::isComplex ? ( M_trans!=CONJ ) : true );
}

template<class Scalar>
void SpmdMultiVectorBase<Scalar>::updateSpmdSpace()
{
  if(globalDim_ == 0) {
    const SpmdVectorSpaceBase<Scalar> *spmdSpace = this->spmdSpace().get();
    if(spmdSpace) {
      globalDim_    = spmdSpace->dim();
      localOffset_  = spmdSpace->localOffset();
      localSubDim_  = spmdSpace->localSubDim();
      numCols_      = this->domain()->dim();
    }
    else {
      globalDim_    = 0;
      localOffset_  = -1;
      localSubDim_  = 0;
      numCols_      = 0;
    }
  }
}

template<class Scalar>
Range1D SpmdMultiVectorBase<Scalar>::validateRowRange( const Range1D &rowRng_in ) const
{
  const Range1D rowRng = Teuchos::full_range(rowRng_in,0,globalDim_-1);
#ifdef TEUCHOS_DEBUG
  TEST_FOR_EXCEPTION(
    !( 0 <= rowRng.lbound() && rowRng.ubound() < globalDim_ ), std::invalid_argument
    ,"SpmdMultiVectorBase<Scalar>::validateRowRange(rowRng): Error, the range rowRng = ["
    <<rowRng.lbound()<<","<<rowRng.ubound()<<"] is not "
    "in the range [0,"<<(globalDim_-1)<<"]!"
    );
#endif
  return rowRng;
}

template<class Scalar>
Range1D SpmdMultiVectorBase<Scalar>::validateColRange( const Range1D &colRng_in ) const
{
  const Range1D colRng = Teuchos::full_range(colRng_in,0,numCols_-1);
#ifdef TEUCHOS_DEBUG
  TEST_FOR_EXCEPTION(
    !(0 <= colRng.lbound() && colRng.ubound() < numCols_), std::invalid_argument
    ,"SpmdMultiVectorBase<Scalar>::validateColRange(colRng): Error, the range colRng = ["
    <<colRng.lbound()<<","<<colRng.ubound()<<"] is not "
    "in the range [0,"<<(numCols_-1)<<"]!"
    );
#endif
  return colRng;
}

} // end namespace Thyra

#endif // THYRA_SPMD_MULTI_VECTOR_BASE_HPP

---