C: Initialize "const" array from the "heap" Post: 302468176

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Top Forums Programming C: Initialize "const" array from the "heap" Post 302468176 by HeavyJ on Tuesday 2nd of November 2010 02:44:16 AM

11-02-2010

Registered User

C: Initialize "const" array from the "heap"

Hello,

I am working on solving an NP-Complete problem, so it is very important that operations and data with limited integer-argument ranges be computed using immutable look-up-tables contained entirely in CPU cache. Retrieval of the look-up-table data must never leave the CPU once initially read in from main memory.

Details about the program function stack are hidden, and it is just poor form to include massive look-up-table data in a ".c" source file.

Code:

#define NUMBER_OF_SQUARES 9
#define SIZE_OF_SQUARE 3

const unsigned short SetSizes[NUMBER_OF_SQUARES] = { 26, 205, 205, 205, 576, 205, 205, 205, 576 };

unsigned int X;
const unsigned short *TimesSquareSize;

// This is an array of pseudo 2-D arrays.
const unsigned char *SetRecords[NUMBER_OF_SQUARES];

TimesSquareSize = (const unsigned short *)malloc(576*sizeof(unsigned short));

for ( X = 0; X < NUMBER_OF_SQUARES; X++ ) SetRecords[X] = (const unsigned char *)malloc(SIZE_OF_SQUARE*sizeof(unsigned char)*SetSizes[X]);

// How do I now initialize the const arrays using fread()?

Here is a sample of my published work:

www.pathcom.com/~vadco/deep.html - It is important for me to solve at least 2 NP-Completes.

All the very best,

JohnPaul Adamovsky

HeavyJ

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mpi_group_range_excl

MPI_Group_range_excl(3OpenMPI)											    MPI_Group_range_excl(3OpenMPI)

NAME

       MPI_Group_range_excl - Produces a group by excluding ranges of processes from an existing group.

SYNTAX

C Syntax
       #include <mpi.h>
       int MPI_Group_range_excl(MPI_Group group, int n, int ranges[][3],
	    MPI_Group *newgroup)

Fortran Syntax
       INCLUDE 'mpif.h'
       MPI_GROUP_RANGE_EXCL(GROUP, N, RANGES, NEWGROUP, IERROR)
	    INTEGER   GROUP, N, RANGES(3,*), NEWGROUP, IERROR

C++ Syntax
       #include <mpi.h>
       Group Group::Range_excl(int n, const int ranges[][3]) const

INPUT PARAMETERS

       group	 Group (handle).

       n	 Number of triplets in array ranges (integer).

       ranges	 A  one-dimensional  array  of integer triplets of the form (first rank, last rank, stride), indicating the ranks in group of pro-
		 cesses to be excluded from the output group newgroup.

OUTPUT PARAMETERS

       newgroup  New group derived from above, preserving the order in group (handle).

       IERROR	 Fortran only: Error status (integer).

DESCRIPTION

       Each computed rank must be a valid rank in group and all computed ranks must be distinct, or else the program is erroneous.

       The functionality of this routine is specified to be equivalent to expanding the array of ranges to an array  of  the  excluded	ranks  and
       passing	the  resulting	array  of  ranks  and  other  arguments  to  MPI_Group_excl.  A  call to MPI_Group_excl is equivalent to a call to
       MPI_Group_range_excl with each rank i in ranks replaced by the triplet (i,i,1) in the argument ranges.

ERRORS

       Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument. C++ func-
       tions  do not return errors. If the default error handler is set to MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism
       will be used to throw an MPI:Exception object.

       Before the error value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job, except  for
       I/O  function  errors. The error handler may be changed with MPI_Comm_set_errhandler; the predefined error handler MPI_ERRORS_RETURN may be
       used to cause error values to be returned. Note that MPI does not guarantee that an MPI program can continue past an error.

SEE ALSO

       MPI_Group_excl
       MPI_Group_free

Open MPI 1.2							  September 2006				    MPI_Group_range_excl(3OpenMPI)