/usr/include/trilinos/ROL_TeuchosBatchManager.hpp

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#ifndef ROLTEUCHOSBATCHMANAGER_HPP
#define ROLTEUCHOSBATCHMANAGER_HPP

#include "ROL_BatchManager.hpp"
#include "Teuchos_RCP.hpp"
#include "Teuchos_Comm.hpp"
#include "Teuchos_CommHelpers.hpp"

namespace ROL {

template<class Real, class Ordinal>
class TeuchosBatchManager : public BatchManager<Real> {
private:
  const Teuchos::RCP<const Teuchos::Comm<Ordinal> > comm_;

public:
  TeuchosBatchManager(const Teuchos::RCP<const Teuchos::Comm<Ordinal> > &comm)
    : comm_(comm) {}

  int batchID(void) {
    return Teuchos::rank<Ordinal>(*comm_);
  }

  int numBatches(void) {
    return Teuchos::size<Ordinal>(*comm_);
  }

  void reduceAll(Real* input, Real* output,
                 const Elementwise::ReductionOp<Real> &r) {
    int nB = this->numBatches();
    std::vector<Real> receiveBuffer(nB);
    Teuchos::gather<Ordinal,Real>(input,1,&receiveBuffer[0],1,0,*comm_);
    output[0] = r.initialValue();
    for (int i = 0; i < nB; i++) {
      r.reduce(receiveBuffer[i],output[0]);
    }
    Teuchos::broadcast<Ordinal,Real>(*comm_,0,1,output);
  }

  void minAll(Real* input, Real* output, int dim) {
    Teuchos::reduceAll<Ordinal,Real>(*comm_,Teuchos::REDUCE_MIN,
      dim, input, output);
  }

  void maxAll(Real* input, Real* output, int dim) {
    Teuchos::reduceAll<Ordinal,Real>(*comm_,Teuchos::REDUCE_MAX,
      dim, input, output);
  }

  void sumAll(Real* input, Real* output, int dim) {
    Teuchos::reduceAll<Ordinal,Real>(*comm_,Teuchos::REDUCE_SUM,
      dim, input, output);
  }

  virtual void sumAll(Vector<Real> &input, Vector<Real> &output) {
    TEUCHOS_TEST_FOR_EXCEPTION( true, std::invalid_argument,
      ">>> ERROR (ROL::TeuchosBatchManager): sumAll(Vector<Real> &input, Vector<Real> &output) is not implemented");
  }

  void barrier(void) {
    Teuchos::barrier<Ordinal>(*comm_); 
  }
};

}

#endif
libtrilinos-rol-dev 12.10.1-3 / usr / include / trilinos / ROL_TeuchosBatchManager.hpp
