1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
|
static char rcsid[] =
"$Id: spmd.c,v 1.5 2009/01/23 01:12:52 pvmsrc Exp $";
/*
* PVM version 3.4: Parallel Virtual Machine System
* University of Tennessee, Knoxville TN.
* Oak Ridge National Laboratory, Oak Ridge TN.
* Emory University, Atlanta GA.
* Authors: J. J. Dongarra, G. E. Fagg, M. Fischer
* G. A. Geist, J. A. Kohl, R. J. Manchek, P. Mucci,
* P. M. Papadopoulos, S. L. Scott, and V. S. Sunderam
* (C) 1997 All Rights Reserved
*
* NOTICE
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby granted
* provided that the above copyright notice appear in all copies and
* that both the copyright notice and this permission notice appear in
* supporting documentation.
*
* Neither the Institutions (Emory University, Oak Ridge National
* Laboratory, and University of Tennessee) nor the Authors make any
* representations about the suitability of this software for any
* purpose. This software is provided ``as is'' without express or
* implied warranty.
*
* PVM version 3 was funded in part by the U.S. Department of Energy,
* the National Science Foundation and the State of Tennessee.
*/
/*
* SPMD example using PVM 3
* Uses pvm_siblings() to determine number of tasks that were spawned
* together
*/
#include <stdio.h>
#ifdef HASSTDLIB
#include <stdlib.h>
#endif
#include <sys/types.h>
#include "pvm3.h"
#define MAXNPROC 32
void dowork();
main()
{
int mytid; /* my task id */
int *tids; /* array of task ids */
int me; /* my process number */
int i;
int ntids;
/* enroll in pvm */
mytid = pvm_mytid();
/* determine the size of my sibling list */
ntids = pvm_siblings(&tids);
for (i = 0; i < ntids; i ++)
if ( tids[i] == mytid)
{
me = i;
break;
}
if (me == 0)
{
printf("Pass a token through the %3d tid ring:\n", ntids);
for (i = 0; i < ntids; i ++)
{
printf( "%6d -> ", tids[i]);
if (i % 6 == 0 && i > 0)
printf("\n");
}
printf("%6d \n", tids[0]);
}
/*--------------------------------------------------------------------------*/
dowork( me, ntids, tids );
/* program finished exit pvm */
pvm_exit();
exit(1);
}
/* Simple example passes a token around a ring */
void
dowork( me, nproc, tids )
int me;
int nproc;
int tids[];
{
int token;
int src, dest;
int count = 1;
int stride = 1;
int msgtag = 4;
/* Determine neighbors in the ring */
if ( me == 0 )
src = tids[nproc -1];
else
src = tids[me -1];
if (me == nproc - 1)
dest = tids[0];
else
dest = tids[me + 1];
if( me == 0 )
{
token = dest;
pvm_initsend( PvmDataDefault );
pvm_pkint( &token, count, stride );
pvm_send( dest, msgtag );
pvm_recv( src, msgtag );
printf("token ring done\n");
}
else
{
pvm_recv( src, msgtag );
pvm_upkint( &token, count, stride );
pvm_initsend( PvmDataDefault );
pvm_pkint( &token, count, stride );
pvm_send( dest, msgtag );
}
}
|
