/usr/include/trilinos/Galeri_Interlaced.h is in libtrilinos-galeri-dev 12.10.1-3.
This file is owned by root:root, with mode 0o644.
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// ************************************************************************
//
// Galeri: Finite Element and Matrix Generation Package
// Copyright (2006) ETHZ/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.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// 3. Neither the name of the Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
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// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Questions about Galeri? Contact Marzio Sala (marzio.sala _AT_ gmail.com)
//
// ************************************************************************
// @HEADER
#ifndef GALERI_INTERLACED_H
#define GALERI_INTERLACED_H
#include "Galeri_Exception.h"
#include "Epetra_Comm.h"
#include "Epetra_Map.h"
#include <limits>
namespace Galeri {
namespace Maps {
template<typename int_type>
inline
Epetra_Map*
TInterlaced(Epetra_Comm& Comm, int_type NumGlobalElements)
{
if (NumGlobalElements <= 0)
throw(Exception(__FILE__, __LINE__,
"Incorrect input parameter to Maps::Interlaced()",
"n = " + toString(NumGlobalElements)));
// this is a funky map. Nodes are assigned so that
// node 0 is given to proc 0, node 1 to proc 1, and
// node i to proc i%NumProcs. Probably not the best, but it
// results in decompositions with lots of boundary nodes.
int NumProcs = Comm.NumProc();
int MyPID = Comm.MyPID();
if (NumGlobalElements / NumProcs > std::numeric_limits<int>::max())
throw(Exception(__FILE__, __LINE__,
"Too high NumGlobalElements to Maps::Interlaced()",
"n = " + toString(NumGlobalElements)));
int NumMyElements = (int) (NumGlobalElements / NumProcs);
if (MyPID < NumGlobalElements % NumProcs) NumMyElements++;
int count = 0;
std::vector<int_type> MyGlobalElements(NumMyElements);
for (int_type i = 0 ; i < NumGlobalElements ; ++i)
{
if (i%NumProcs == MyPID)
MyGlobalElements[count++] = i;
}
if (count != NumMyElements)
throw(Exception(__FILE__, __LINE__,
"Something went wrong in Maps::Interlaced()",
"count = " + toString(count)
+ ", NumMyElements = " + toString(NumMyElements)));
#if !defined(EPETRA_NO_32BIT_GLOBAL_INDICES) || !defined(EPETRA_NO_64BIT_GLOBAL_INDICES)
return(new Epetra_Map(NumGlobalElements, NumMyElements,
&MyGlobalElements[0], 0, Comm));
#else
return(new Epetra_Map);
#endif
} // TInterlaced()
#ifndef EPETRA_NO_32BIT_GLOBAL_INDICES
Epetra_Map*
Interlaced(Epetra_Comm& Comm, int NumGlobalElements) {
return TInterlaced<int>(Comm, NumGlobalElements);
}
#endif
#ifndef EPETRA_NO_64BIT_GLOBAL_INDICES
Epetra_Map*
Interlaced64(Epetra_Comm& Comm, long long NumGlobalElements) {
return TInterlaced<long long>(Comm, NumGlobalElements);
}
#endif
} // namespace Maps
} // namespace Galeri
#endif
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