Epetra_Util: The Epetra Util Wrapper Class. More...

#include <Epetra_Util.h>

Public Member Functions
	Epetra_Util ()
	Epetra_Util Constructor.
	Epetra_Util (const Epetra_Util &Util)
	Epetra_Util Copy Constructor.
virtual	~Epetra_Util ()
	Epetra_Util Destructor.

Random number utilities
static const double	chopVal_
unsigned int	RandomInt ()
	Returns a random integer on the interval (0, 2^31-1).
double	RandomDouble ()
	Returns a random double on the interval (-1.0,1.0).
unsigned int	Seed () const
	Get seed from Random function.
int	SetSeed (unsigned int Seed_in)
	Set seed for Random function.
template<typename T>
static void EPETRA_LIB_DLL_EXPORT	Sort (bool SortAscending, int NumKeys, T Keys, int NumDoubleCompanions, double DoubleCompanions, int NumIntCompanions, int IntCompanions, int NumLongLongCompanions, long long *LongLongCompanions)
	Epetra_Util Sort Routine (Shell sort).
static void	Sort (bool SortAscending, int NumKeys, int Keys, int NumDoubleCompanions, double DoubleCompanions, int NumIntCompanions, int IntCompanions, int NumLongLongCompanions, long long *LongLongCompanions)
static void	Sort (bool SortAscending, int NumKeys, long long Keys, int NumDoubleCompanions, double DoubleCompanions, int NumIntCompanions, int IntCompanions, int NumLongLongCompanions, long long *LongLongCompanions)
static void	Sort (bool SortAscending, int NumKeys, int Keys, int NumDoubleCompanions, double DoubleCompanions, int NumIntCompanions, int *IntCompanions)
static void	Sort (bool SortAscending, int NumKeys, double Keys, int NumDoubleCompanions, double DoubleCompanions, int NumIntCompanions, int IntCompanions, int NumLongLongCompanions, long long *LongLongCompanions)
static Epetra_Map	Create_Root_Map (const Epetra_Map &usermap, int root=0)
	Epetra_Util Create_Root_Map function.
static Epetra_Map	Create_OneToOne_Map (const Epetra_Map &usermap, bool high_rank_proc_owns_shared=false)
	Epetra_Util Create_OneToOne_Map function.
static Epetra_BlockMap	Create_OneToOne_BlockMap (const Epetra_BlockMap &usermap, bool high_rank_proc_owns_shared=false)
	Epetra_Util Create_OneToOne_Map function.
static Epetra_BlockMap	Create_OneToOne_BlockMap64 (const Epetra_BlockMap &usermap, bool high_rank_proc_owns_shared=false)
	Epetra_Util Create_OneToOne_Map function for long long ordinals.
static int	SortCrsEntries (int NumRows, const int CRS_rowptr, int CRS_colind, double *CRS_vals)
	Epetra_Util SortCrsEntries function.
static int	SortCrsEntries (int NumRows, const size_t CRS_rowptr, int CRS_colind, double *CRS_vals)
	Epetra_Util SortCrsEntries function.
static int	SortAndMergeCrsEntries (int NumRows, int CRS_rowptr, int CRS_colind, double *CRS_vals)
	Epetra_Util SortAndMergeCrsEntries function.
static int	SortAndMergeCrsEntries (int NumRows, size_t CRS_rowptr, int CRS_colind, double *CRS_vals)
	Epetra_Util SortAndMergeCrsEntries function.
static int	GetPidGidPairs (const Epetra_Import &Importer, std::vector< std::pair< int, int > > &gpids, bool use_minus_one_for_local)
	Epetra_Util GetPidGidPairs function.
static int	GetPidGidPairs (const Epetra_Import &Importer, std::vector< std::pair< int, long long > > &gpids, bool use_minus_one_for_local)
static int	GetPids (const Epetra_Import &Importer, std::vector< int > &pids, bool use_minus_one_for_local)
	Epetra_Util GetPids function.
static int	GetRemotePIDs (const Epetra_Import &Importer, std::vector< int > &RemotePIDs)
	Epetra_Util GetRemotePIDs.
static double	Chop (const double &Value)
	Epetra_Util Chop method. Return zero if input Value is less than ChopValue.

Detailed Description

Epetra_Util: The Epetra Util Wrapper Class.

The Epetra_Util class is a collection of useful functions that cut across a broad set of other classes.

A random number generator is provided, along with methods to set and retrieve the random-number seed.

The random number generator is a multiplicative linear congruential generator, with multiplier 16807 and modulus 2^31 - 1. It is based on the algorithm described in "Random Number Generators: Good Ones Are Hard To Find", S. K. Park and K. W. Miller, Communications of the ACM, vol. 31, no. 10, pp. 1192-1201.
Sorting is provided by a static function on this class (i.e., it is not necessary to construct an instance of this class to use the Sort function).
A static function is provided for creating a new Epetra_Map object with 1-to-1 ownership of entries from an existing map which may have entries that appear on multiple processors.

Epetra_Util is a serial interface only. This is appropriate since the standard utilities are only specified for serial execution (or shared memory parallel).

Constructor & Destructor Documentation

◆ Epetra_Util() [1/2]

Epetra_Util::Epetra_Util ( )

inline

Epetra_Util Constructor.

Builds an instance of a serial Util object.

Referenced by Epetra_Util().

◆ Epetra_Util() [2/2]

Epetra_Util::Epetra_Util ( const Epetra_Util & Util )

inline

Epetra_Util Copy Constructor.

Makes an exact copy of an existing Epetra_Util instance.

References Epetra_Util().

Member Function Documentation

◆ Create_OneToOne_BlockMap()

Epetra_BlockMap Epetra_Util::Create_OneToOne_BlockMap	(	const Epetra_BlockMap &	usermap,
		bool	high_rank_proc_owns_shared = false )

static

Epetra_Util Create_OneToOne_Map function.

Function to create a new Epetra_Map object with 1-to-1 ownership of entries from an existing map which may have entries that appear on multiple processors.

◆ Create_OneToOne_BlockMap64()

Epetra_BlockMap Epetra_Util::Create_OneToOne_BlockMap64	(	const Epetra_BlockMap &	usermap,
		bool	high_rank_proc_owns_shared = false )

static

Epetra_Util Create_OneToOne_Map function for long long ordinals.

Function to create a new Epetra_Map object with 1-to-1 ownership of entries from an existing map which may have entries that appear on multiple processors.

◆ Create_OneToOne_Map()

Epetra_Map Epetra_Util::Create_OneToOne_Map	(	const Epetra_Map &	usermap,
		bool	high_rank_proc_owns_shared = false )

static

Epetra_Util Create_OneToOne_Map function.

Function to create a new Epetra_Map object with 1-to-1 ownership of entries from an existing map which may have entries that appear on multiple processors.

◆ Create_Root_Map()

Epetra_Map Epetra_Util::Create_Root_Map	(	const Epetra_Map &	usermap,
		int	root = 0 )

static

Epetra_Util Create_Root_Map function.

Function to create a new Epetra_Map object with all GIDs sent to the root processor which is zero by default. All all processors will have no GIDs. This root map can then be used to create an importer or exporter that will migrate all data to the root processor.

If root is set to -1 then the user map will be replicated completely on all processors.

◆ GetPidGidPairs()

int Epetra_Util::GetPidGidPairs	(	const Epetra_Import &	Importer,
		std::vector< std::pair< int, int > > &	gpids,
		bool	use_minus_one_for_local )

static

Epetra_Util GetPidGidPairs function.

For each GID in the TargetMap, find who owns the GID in the SourceMap. This works entirely from the Distributor and has no communication at all. This routine only works if your Importer is using an Epetra_MpiDistributor under the hood.

The routine returns (by reference) a std::vector of std::pair<int,int> which contains (PID,GID) pairs. If the use_minus_one_for_local==true, any GIDs owned by this processor get -1 instead of their PID.

References GetPidGidPairs().

Referenced by GetPidGidPairs().

◆ GetPids()

int Epetra_Util::GetPids	(	const Epetra_Import &	Importer,
		std::vector< int > &	pids,
		bool	use_minus_one_for_local )

static

Epetra_Util GetPids function.

Like GetPidGidPairs, but just gets the PIDs, ordered by the columnmap

◆ GetRemotePIDs()

int Epetra_Util::GetRemotePIDs	(	const Epetra_Import &	Importer,
		std::vector< int > &	RemotePIDs )

static

Epetra_Util GetRemotePIDs.

Gets a list of remote PIDs from an importer in the order corresponding to the RemoteLIDs

◆ Seed()

unsigned int Epetra_Util::Seed ( ) const

Get seed from Random function.

Returns: Current random number seed.

◆ SetSeed()

int Epetra_Util::SetSeed ( unsigned int Seed_in )

Set seed for Random function.

Parameters

In	Seed - An integer on the interval [1, 2^31-2]

Returns: Integer error code, set to 0 if successful.

◆ Sort()

template<typename T>

void EPETRA_LIB_DLL_EXPORT Epetra_Util::Sort	(	bool	SortAscending,
		int	NumKeys,
		T *	Keys,
		int	NumDoubleCompanions,
		double **	DoubleCompanions,
		int	NumIntCompanions,
		int **	IntCompanions,
		int	NumLongLongCompanions,
		long long **	LongLongCompanions )

static

Epetra_Util Sort Routine (Shell sort).

This function sorts a list of integer values in ascending or descending order. Additionally it sorts any number of companion lists of doubles or ints. A shell sort is used, which is fast if indices are already sorted.

Parameters

In	SortAscending - Sort keys in ascending order if true, otherwise sort in descending order..
In	NumKeys - Number of integer values to be sorted.
In/Out	Keys - List of integers to be sorted.
In	NumDoubleCompanions - Number of lists of double precision numbers to be sorted with the key. If set to zero, DoubleCompanions is ignored and can be set to zero.
In	DoubleCompanions - DoubleCompanions[i] is a pointer to the ith list of doubles to be sorted with key.
In	NumIntCompanions - Number of lists of integers to be sorted with the key. If set to zero, IntCompanions is ignored and can be set to zero.
In	IntCompanions - IntCompanions[i] is a pointer to the ith list of integers to be sorted with key.

References Sort().

Referenced by Sort().

The documentation for this class was generated from the following file:

Epetra_Util.h

Public Member Functions

Random number utilities

Detailed Description

Constructor & Destructor Documentation

◆ Epetra_Util() [1/2]

◆ Epetra_Util() [2/2]

Member Function Documentation

◆ Create_OneToOne_BlockMap()

◆ Create_OneToOne_BlockMap64()

◆ Create_OneToOne_Map()

◆ Create_Root_Map()

◆ GetPidGidPairs()

◆ GetPids()

◆ GetRemotePIDs()

◆ Seed()

◆ SetSeed()

◆ Sort()