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ambiq-hal-sys/ambiq-sparkfun-sdk/third_party/prime_mpi/license/gnu_lgpl.txt
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GNU LESSER GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
This version of the GNU Lesser General Public License incorporates
the terms and conditions of version 3 of the GNU General Public
License, supplemented by the additional permissions listed below.
0. Additional Definitions.
As used herein, "this License" refers to version 3 of the GNU Lesser
General Public License, and the "GNU GPL" refers to version 3 of the GNU
General Public License.
"The Library" refers to a covered work governed by this License,
other than an Application or a Combined Work as defined below.
An "Application" is any work that makes use of an interface provided
by the Library, but which is not otherwise based on the Library.
Defining a subclass of a class defined by the Library is deemed a mode
of using an interface provided by the Library.
A "Combined Work" is a work produced by combining or linking an
Application with the Library. The particular version of the Library
with which the Combined Work was made is also called the "Linked
Version".
The "Minimal Corresponding Source" for a Combined Work means the
Corresponding Source for the Combined Work, excluding any source code
for portions of the Combined Work that, considered in isolation, are
based on the Application, and not on the Linked Version.
The "Corresponding Application Code" for a Combined Work means the
object code and/or source code for the Application, including any data
and utility programs needed for reproducing the Combined Work from the
Application, but excluding the System Libraries of the Combined Work.
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without being bound by section 3 of the GNU GPL.
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b) under the GNU GPL, with none of the additional permissions of
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taken together, effectively do not restrict modification of the
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for conveying Corresponding Source.)
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Library side by side in a single library together with other library
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ambiq-hal-sys/ambiq-sparkfun-sdk/third_party/prime_mpi/src/prime_mpi.c
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#define AMBIQ_MICRO 1
#ifndef AMBIQ_MICRO
# include <math.h>
# include <mpi.h>
# include <stdio.h>
# include <stdlib.h>
# include <time.h>
int main ( int argc, char *argv[] );
int prime_number ( int n, int id, int p );
void timestamp ( );
/******************************************************************************/
int main ( int argc, char *argv[] )
/******************************************************************************/
/*
Purpose:
MAIN is the main program for PRIME_MPI.
Discussion:
This program calls a version of PRIME_NUMBER that includes
MPI calls for parallel processing.
Licensing:
This code is distributed under the GNU LGPL license.
Modified:
07 August 2009
Author:
John Burkardt
*/
{
int i;
int id;
int ierr;
int n;
int n_factor;
int n_hi;
int n_lo;
int p;
int primes;
int primes_part;
double wtime;
n_lo = 1;
n_hi = 262144;
n_factor = 2;
/*
Initialize MPI.
*/
ierr = MPI_Init ( &argc, &argv );
/*
Get the number of processes.
*/
ierr = MPI_Comm_size ( MPI_COMM_WORLD, &p );
/*
Determine this processes's rank.
*/
ierr = MPI_Comm_rank ( MPI_COMM_WORLD, &id );
if ( id == 0 )
{
timestamp ( );
printf ( "\n" );
printf ( "PRIME_MPI\n" );
printf ( " C/MPI version\n" );
printf ( "\n" );
printf ( " An MPI example program to count the number of primes.\n" );
printf ( " The number of processes is %d\n", p );
printf ( "\n" );
printf ( " N Pi Time\n" );
printf ( "\n" );
}
n = n_lo;
while ( n <= n_hi )
{
if ( id == 0 )
{
wtime = MPI_Wtime ( );
}
ierr = MPI_Bcast ( &n, 1, MPI_INT, 0, MPI_COMM_WORLD );
primes_part = prime_number ( n, id, p );
ierr = MPI_Reduce ( &primes_part, &primes, 1, MPI_INT, MPI_SUM, 0,
MPI_COMM_WORLD );
if ( id == 0 )
{
wtime = MPI_Wtime ( ) - wtime;
printf ( " %8d %8d %14f\n", n, primes, wtime );
}
n = n * n_factor;
}
/*
Terminate MPI.
*/
ierr = MPI_Finalize ( );
/*
Terminate.
*/
if ( id == 0 )
{
printf ( "\n");
printf ( "PRIME_MPI - Master process:\n");
printf ( " Normal end of execution.\n");
printf ( "\n" );
timestamp ( );
}
return 0;
}
#endif // !AMBIQ_MICRO
/******************************************************************************/
int prime_number ( int n, int id, int p )
/******************************************************************************/
/*
Purpose:
PRIME_NUMBER returns the number of primes between 1 and N.
Discussion:
In order to divide the work up evenly among P processors, processor
ID starts at 2+ID and skips by P.
A naive algorithm is used.
Mathematica can return the number of primes less than or equal to N
by the command PrimePi[N].
N PRIME_NUMBER
1 0
10 4
100 25
1,000 168
10,000 1,229
100,000 9,592
1,000,000 78,498
10,000,000 664,579
100,000,000 5,761,455
1,000,000,000 50,847,534
Licensing:
This code is distributed under the GNU LGPL license.
Modified:
21 May 2009
Author:
John Burkardt
Parameters:
Input, int N, the maximum number to check.
Input, int ID, the ID of this process,
between 0 and P-1.
Input, int P, the number of processes.
Output, int PRIME_NUMBER, the number of prime numbers up to N.
*/
{
int i;
int j;
int prime;
int total;
total = 0;
for ( i = 2 + id; i <= n; i = i + p )
{
prime = 1;
for ( j = 2; j < i; j++ )
{
if ( ( i % j ) == 0 )
{
prime = 0;
break;
}
}
total = total + prime;
}
return total;
}
#ifndef AMBIQ_MICRO
/******************************************************************************/
void timestamp ( void )
/******************************************************************************/
/*
Purpose:
TIMESTAMP prints the current YMDHMS date as a time stamp.
Example:
31 May 2001 09:45:54 AM
Licensing:
This code is distributed under the GNU LGPL license.
Modified:
24 September 2003
Author:
John Burkardt
Parameters:
None
*/
{
# define TIME_SIZE 40
static char time_buffer[TIME_SIZE];
const struct tm *tm;
size_t len;
time_t now;
now = time ( NULL );
tm = localtime ( &now );
len = strftime ( time_buffer, TIME_SIZE, "%d %B %Y %I:%M:%S %p", tm );
printf ( "%s\n", time_buffer );
return;
# undef TIME_SIZE
}
#endif // !AMBIQ_MICRO