/usr/include/trilinos/Galeri_Random.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,
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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_RANDOM_H
#define GALERI_RANDOM_H
#include "Galeri_Exception.h"
#include "Galeri_Utils.h"
#include "Epetra_Comm.h"
#include "Epetra_Map.h"
#include "Epetra_Util.h"
#include <limits>
namespace Galeri {
namespace Maps {
template<typename int_type>
inline
Epetra_Map*
TRandom(const Epetra_Comm& Comm, const int_type n)
{
if (n <= 0 || n > std::numeric_limits<int>::max())
throw(Exception(__FILE__, __LINE__,
"Incorrect input parameter to Maps::Random()",
"n = " + toString(n)));
// This is the idea: I create the map on proc 0, then I broadcast
// it to all procs. This is not very efficient, but saves some MPI calls.
std::vector<int> part(n);
if (Comm.MyPID() == 0)
{
Epetra_Util Util;
for (int_type i = 0 ; i < n ; ++i)
{
unsigned int r = Util.RandomInt();
part[i] = r%(Comm.NumProc());
}
}
Comm.Broadcast(&part[0], n, 0);
// count the elements assigned to this proc
int NumMyElements = 0;
for (int_type i = 0 ; i < n; ++i)
if (part[i] == Comm.MyPID()) NumMyElements++;
// get the loc2global list
std::vector<int_type> MyGlobalElements(NumMyElements);
int count = 0;
for (int_type i = 0 ; i < n ; ++i)
if (part[i] == Comm.MyPID())
MyGlobalElements[count++] = i;
#if !defined(EPETRA_NO_32BIT_GLOBAL_INDICES) || !defined(EPETRA_NO_64BIT_GLOBAL_INDICES)
return(new Epetra_Map(n, NumMyElements, (NumMyElements ? &MyGlobalElements[0] : NULL), 0, Comm));
#else
return(new Epetra_Map);
#endif
} // TRandom()
#ifndef EPETRA_NO_32BIT_GLOBAL_INDICES
Epetra_Map*
Random(const Epetra_Comm& Comm, const int n) {
return TRandom<int>(Comm, n);
}
#endif
#ifndef EPETRA_NO_64BIT_GLOBAL_INDICES
Epetra_Map*
Random64(const Epetra_Comm& Comm, const long long n) {
return TRandom<long long>(Comm, n);
}
#endif
} // namespace BlockMaps
} // namespace Galeri
#endif
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